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Öğe An applied study on energy analysis of a coke oven(Edp Sciences S A, 2024) Ergul, Murat; Selimli, SelcukIn this study, the energy view of an oven of a 70-oven coke battery in an iron and steel plant was evaluated based on operating parameters and recommendations for improving efficiency were made. A mass and energy balance per coking period (p) was created for a coke oven. It was found that during each coking period, 51.2% of the energy input was used as coking heat. It is predicted that approximately 6.91% of the input energy can be recovered from flue gas into the combustion air. By recovering the heat from the flue gas into the combustion air, the efficiency of the coke oven can be increased to 58.11%. The heat of the coke oven gas can be recovered and converted into usable form, which accounts for 6.53% of the total energy input. With the dry quenching process, it is possible to recover around 24% of the energy used from coke. Improved oven insulation, heat recovery from coke and flue gases, and the dry quenching process can recover energy worth more than 25.19 GJ/p. The energy efficiency of the furnace was predicted to rise to 82.11% with coke dry quenching and to more than 88.64% with coke gas heat recovery and insulation upgrades. The potential economic savings are $2578, equivalent to a reduction in CO2 emissions of 2.45 tons per coking period. The financial equivalent of emissions reductions from carbon trading could be $233 per coking period. Through the processes of dry coke quenching, coke gas (CG), and flue gas heat recovery and thermal insulation improvements of the coke battery, the total amount of recoverable energy can exceed 617,294 GJ/year.Öğe Closed-loop aluminium oxide nanofluid cooled photovoltaic thermal collector energy and exergy analysis, an experimental study(Elsevier, 2022) Jasim, Othman Mohammed Jasim; Selimli, Selcuk; Dumrul, Hakan; Yilmaz, SezayiPV/T collector cooling was studied experimentally regarding the energy and exergy analysis by Al2O3 nanofluid circulation which is in two different flow patterns. A 20 W polycrystalline PV module was used as a comparison module. Identical PV modules were used for the construction of PV/T collectors, too. PV/T-A collector model was created with the PV module, a copper coil tube was the nanofluid circulated was placed to the backside of it. A PV/T-B collector was made up by placing the Al2O3 nanofluid circulating polyamide channel structure on the backside of the PV module. A 50 W monocrystalline PV module was used to supply power to the circulation pump and heat exchanger fans to provide energy independence from mains electricity. PV/T-A and PV/T-B collectors exposed to 792.83 W/m(2) solar radiation equivalent 121.3 W solar power were cooled 28.94% and 48.54% better regarding the PV module. Electrical power outputs are 5.8 W, 8.13 W, 10.34 W for the PV module, PV/T-A, and PV/T-B collectors. Electrical gaining from the PV/T-A and PV/T-B collectors increased 40.17% and 78.27% by cooling. Thermal gaining from PV/T-A and PV/T-B collectors are 42.8 W and 53.39 W. First and second law efficiencies were determined as 4.78%, 42%, 52.52%, and 5.01%, 7.35%, and 9.42% for PV module, PV/T-A, and PV/T-B collectors. Enhancement in solar utilization with PV/T-A and PV/T-B collectors are 45.13 W, and 57.93 W and proportionate equivalents to 37.2% and 47.75%. Enviro-economics size was estimated as 0.094 tCO(2)/year, and 0.121 tCO(2)/year carbon reduction and equivalent 1.41$ and 1.81$ carbon trade value.Öğe Combined effects of magnetic and electrical field on the hydrodynamic and thermophysical parameters of magnetoviscous fluid flow(Pergamon-Elsevier Science Ltd, 2015) Selimli, Selcuk; Recebli, Ziyaddin; Arcaklioglu, ErolCombine effect of externally applied magnetic and electrical field on the hydrodynamic and thermophysical properties of incompressible steady state magnetoviscous flow of liquid lithium in an enclosure was examined for applied magnetic field values are B = 0 T to 0.15 T and electrical field values are E=0 V/m to +/-9e-6V/m. According to the results, increase of magnetic and electrical field decreases the flow velocity but also increases the shear stress, temperature, heat flux and Nusselt number. Application and increase of electrical field in the positive direction increases the influence of magnetic field on the hydrodynamic and thermophysical properties of flow domain. As for that increase of applied electrical field in the negative direction decreased the effect of magnetic field. (C) 2015 Elsevier Ltd. All rights reserved.Öğe Effect of dust deposition density and particle size on the energetic and exergetic performance of photovoltaic modules: An experimental study(Pergamon-Elsevier Science Ltd, 2024) Warsama, Aziza Idriss; Selimli, SelcukDust deposition density and particle size impact on PV module energy utilization was investigated. Module A was clean, and modules B, C and D were dusted with deposition densities of 6.94 g/m2, 13.88 g/m2, and 20.83 g/m2, respectively. Test-1 and test-2 were carried out with steel slag dust particles with a size of 61 mu m and 109 mu m, respectively. The decrease in energetic efficiency comparing module A was 2.45%, 3.99% and 5.9% for the B, C and D modules in test-1, respectively. In test-2, the decrease in energetic efficiency was 1.77%, 2.77%, 3.63% for modules B, C, and D. In test-1, the exergy efficiency of modules B, C, and D declined by 2.67%, 4.3%, 6.62%. In test-2, the exergy efficiency fell by 1.94%, 2.84%, 4.19% for modules B, C and D, respectively. The annual exergy destruction cost was calculated to be $49.97, $51.48, $52.42, and $53.78 for modules A, B, C, and D, respectively. For test-2, the corresponding values were $48.13, $49.2, $49.66, and $50.4 for modules A, B, C, and D, respectively. The decrease in energetic and exergetic efficiency was lowered by the particle size increase. The decrease in energetic and exergetic efficiency was raised by increased deposition density.Öğe The effect of thermal camera and pyrometer usage in industrial tempering furnaces on optimum combustion performance(Emerald Group Publishing Ltd, 2015) Ozkaymak, Mehmet; Selimli, Selcuk; Kaya, Durmus; Yilmaz, Esref; Tabak, Abdulsamed; Aksay, Mehmet VolkanThe decrease of energy sources, the increase of energy need and energy costs, competitive conditions in industry and environmental sensitivity require the effective usage of energy sources. In this study, optimum combustion study by using thermal camera and pyrometer in the correct heat furnace of an industry plant for the effective usage of energy in industry. For this reason, in tempering furnace of a milling roll workshop, in order to control the efficiency of tempering, detect the flame length and color and control the homogeneous tempering, 4 thermal cameras and 4 pyrometers have been assembled to the appropriate locations of the furnace. In the study, the tempering furnace has been observed and the results of observations have been evaluated. The contribution of the changes made to the production has been calculated by the information obtained from thermal camera and pyrometer and has been examined with the date of reimbursement. Possible spare part and production saving has been established as 364,460 $ annually and back-payment time as 3 months. Accident risk that is caused by the hot air and sometimes occurs during the controls has also been reduced so that the workers have been forced to work more safely according to WHS (workers' health and security).Öğe Effectiveness of heat sink fin position on photovoltaic thermal collector cooling supported by paraffin and steel foam: An experimental study(Pergamon-Elsevier Science Ltd, 2022) Al Hariri, Ahmad; Selimli, Selcuk; Dumrul, HakanForced convective cooling effectiveness on photovoltaic thermal collector electrical and thermal performance was experimentally studied with phase change material (paraffin) + steel foam mixture and two different angular positioned finned heat sink attachments. Fins are positioned flat and inclined, and air was forced with fan to flow between them. Solar radiation, temperature, electrical and thermal power, energy, and exergy efficiencies were determined and compared with reference photovoltaic module data. The first photovoltaic thermal collector was constructed with phase change material (paraffin) + steel foam mixture application to the back surface and covering with an incline finned heat sink. The second one was assembled with phase change material (paraffin) + steel foam filling to back surface and covering with a flat finned heat sink. Incline and flat finned heat sink attached collectors were cooled 12.23% and 21.67% relatively more than photovoltaic module. Electrical efficiency improvement with incline finned and flat finned heat sink application acquired approximately 5.09% and 6.18% relative to the photovoltaic module, which has 4.38% electrical efficiency, thanks to the cooling provided. The overall efficiencies were 41.4% and 59.53%. Photovoltaic module exergy efficiency is 4.67%, it is increased to 5.59% and 6.87% by cooling with incline finned heat sink and flat finned heat sink applications. Utilizable energy enhancement is identified approximately 140.32 kWh/year and 207.42 kWh/year by assuming 2738 h annual sunshine time in Turkey. These potentials rely on increase in electrical efficiency and heat recovery during cooling of PV/T collectors with incline and flat finned heat sinks. The predicted energy profit can be estimated at $7.01/year and $10.37/year, and its equivalent in emission reduction can be 115.76 kg center dot CO2/year and 171.12 kg center dot CO2/year.Öğe Electrical field effect on three-dimensional magnetohydrodynamic pipe flow: a CFD study(Inderscience Enterprises Ltd, 2016) Recebli, Ziyaddin; Gedik, Engin; Selimli, SelcukSteady, laminar three-dimensional (3D) magnetohydrodynamic (MHD) flow of an electrically conducting fluid in a circular pipe under the both magnetic and electrical field are studied. External magnetic and electrical fields are applied perpendicular to the flow direction and each other while the fluid motion is subjected to constant pressure gradient along axial-direction in the present paper. Fluent 14.0, the finite element software based on the finite volume approach was used to calculate the 3D fluid dynamics and electromagnetic field partial differential equations iteratively. The originality of this work is that, in addition to magnetic field; the effect of electrical field on MHD flows is being examined with help of user defined function (UDF) code. The magnetic field leads to decrease in the velocity of flow, whereas the electrical field applied with magnetic field acted to increase and decrease the velocity of flow depending on the direction of applied external electrical field. The obtained results were depicted graphically and discussed.Öğe Energetic and Exergetic Analyses of Experimentally Investigated Hybrid Solar Air Heater(Asce-Amer Soc Civil Engineers, 2023) Akdamar, Ismail; Dumrul, Hakan; Selimli, Selcuk; Yilmaz, SezayiSolar energy is a type of renewable energy that is readily available, but it must be converted to a usable form using a highly efficient method. The global energy problem that has surfaced in recent years shows the importance of both practical and scientific studies on using solar energy for space heating. Solar air heaters are large volume systems used for space heating. Research on the geometry and surface forms of solar air collectors is focused on reducing system volume and optimizing the use of solar energy. A photovoltaic (PV) module can be cooled with a fluid to prevent a decrease in efficiency due to heat while generating electrical power. The subject of this study is the idea of using the heat from cooling the modules to support a solar air heater. The improvement of the thermal performance of a solar air collector with a cooling thermal load of the concentrated photovoltaic thermal collector (CPV/T) was experimentally investigated. The heat exchanger, which removes the heat of the water-ethylene glycol circulating in the photovoltaic thermal collector, is mounted in the solar air heater's chamber of one of the two identical solar air heaters, and the first hybrid unit was obtained (i.e., first unit). The ordinary one was called the second unit. Heated air left the first and second units at average temperatures of 45.87 degrees C and 38.83 degrees C, respectively. Although the airflow rates in the units are the same, the air temperature in the first unit was increased by 18.13%. The heat contribution of the heat exchanger to the first unit was 128.96 W. The first and second law efficiencies of the first and second units were calculated as 51.89%, 15.22%, and 45.4%, 10.34%, respectively. The energetic and exergetic improvement of the first unit was found to be 6.49% and 4.88%, respectively. The local solar utilization capability is 797.76 kW middoth/year and 609.12 kW middoth/year for the first and second units, respectively. The waste heat from the CPV/T collector cooling cycle, which is 188.64 kW middoth/year, was recovered for heating air in the first unit. The recovery of waste heat for use in the first unit provided a significant performance improvement over the second unit. The environmental contribution of the waste heat recovery means 144 kg CO2 emission per year less in emission release. (C) 2022 American Society of Civil Engineers.Öğe Evaluation of internal structure modifications effect of two-phase closed thermosyphon on performance: An experimental study(Pergamon-Elsevier Science Ltd, 2021) Ozbas, Engin; Selimli, Selcuk; Ozkaymak, Mehmet; Frej, Alsediq S. S.In this paper, an experimental study has been carried to enhance the effectiveness of a two-phase closed ther-mosyphon (TPCT) type heat pipe. For this purpose, three different designs have been developed by modifying the internal structure so as not to interfere with the physical operation of TPCT. Three heat pipes with different internal structures were manufactured with additional pipes placed longitudinally inside the evaporator and condenser sections of the normal (conventional) TPCT. Ionized pure water is used as a working fluid at the same rate in Normal, Type-1, Type-2, and Type-3 heat pipes. TPCTs are positioned at three different inclination angles, 26 degrees, 41 degrees, and 56 degrees, to see the performance effect not only among themselves but also on the changes made by the gravitational effect. For each tilt angle, four TPCTs were simultaneously powered by solar energy on three different days. As a result of the experiments carried out in July, it has been observed that the optimum incli-nation angle for solar water heated TPCT is 26 degrees. In addition, it was found that with the increase of the angle of tilt, the thermal resistance (R) of the heat pipes also increased and the heat transferability of the TPCT decreased. Comparing the new designs and normal TPCT, Type-2 acted better at tilt angles of both 26 degrees and 41oAs a result, the heat transfer and efficiency of normal TPCT have been improved by almost 14% with Type-2 at the tilt angle of 26 degrees.Öğe EVALUATION THE EFFECTS OF USED REFRIGERANTS R134a AND R600a IN COOLING SYSTEMS ON THE SYSTEM PERFORMANCE(Yildiz Technical Univ, 2014) Selimli, Selcuk; Recebli, Ziyaddin; Gorken, MehmetKnown as R134a refrigerant is in the class of refrigerants as uneconomic and having global warming potential. In the scope of study, determination the effect of R600a refrigerant which is known more environment friendly and economic alternative of R134a refrigerant on the cooling performance of the cooling machine was aimed. In this reason, effect of R134a and R600a refrigerants on the cooling performance of the cooling machine was experimentally studied. Experimentation setup was established with 70x70x50 cm dimensions cooling room and cooling unit. 100 gr refrigerant filled experimentation setup was operated at 28 degrees C and 35 degrees C ambient temperature in a period of time and according to the taken measurements cooling systems COP value was compared. As a result, using R600a refrigerant instead of R134a refrigerant, the cooling machine average COP value was increased 4%. This case demonstrates that R600a using cooling machine performs higher performance than R134a using cooling machine. Also, it was seen that a using coolant R134a cooled the space faster than a using coolant R600a in cooling machine.Öğe Experimental and numerical analysis of energy and exergy performance of photovoltaic thermal water collectors(Pergamon-Elsevier Science Ltd, 2021) Selimli, Selcuk; Dumrul, Hakan; Yilmaz, Sezayi; Akman, OzgurThe aim of this paper is the investigation and comparison of PV (Photovoltaic) module and PV/T (Photovoltaic/ Thermal) collectors regarding the energetic and exergetic point of view. A reference PV module and two different flow pattern PV/T collector was experimentally observed and evaluated results were compared concerning first and second law of thermodynamics. Experimentation results are also compared with the numerical results that were obtained by ANSYS Fluent software. Experimentation proceeded in Karabuk, Turkey. As a result, it was concluded that the PV module electrical efficiency is equal to its overall efficiency and is approximately 7.96%. Thermal, electrical, and overall energy efficiency values are 29.08%, 9.74%, and 38.82% for PV/T1, and PV/T2 are 49.68%, 10.19%, and 59.88%. The exergy efficiency of PV, PV/T1, and PV/T2 are determined at approximately 4.63%, 10.64%, and 11.53%. When the exergy efficiency values are compared, solar energy utilization in the renewable energy class for both PV/T collectors formed with the cooling units integrated with the PV panel has been almost doubled.Öğe Experimental Observation of Effect of Heat Pump on Vacuum Tube Solar Collector Performance(Gazi Univ, 2013) Selimli, Selcuk; Recebli, Ziyaddin; Aydin, AlperIn this study, combine operation of air source heat pump and vacuum tube solar collector system was experimentally observed. Contribution of heat pump system on solar collector system performance was determined. Solar collector experimentation setup was constructed with 30 It water storage tank and 4 items vacuum tube. Heat pump condenser which is in the form of pipe coil was placed into the water storage tank. System evaporator is fan assisted aluminium fin and 2400 W capacities. Heat pump compressor is 745 W power. Temperature was controlled by 303-363 K range thermostat. During the experimentations solar radiation intensity, heating time and temperature of water was recorded. Experimentations were repeated for three different operation conditions. In the first day, solar collector and heat pump system, the second day, only solar collector and on the third day, only heat pump system was operated and experimentation was completed. It is determined that, the system efficiency was enhanced about 5% according to the evaluations.Öğe Experimental study of the performance of heat recovery by a fin and tube heat exchange tank attached to the dishwasher greywater line(Elsevier, 2019) Selimli, Selcuk; Karabas, Talha; Taskin, Yunus; Karatas, Mehmet BurakIn this study, it was experimentally investigated to recover the wastewater (greywater) heat of a household dishwasher to the freshwater taken from the tap during the washing process. In this context, a heat exchange tank is connected between the drain line of the dishwasher and the tap water line. The washing process was observed for two different conditions. First, the dishwasher washing process experiments were carried out for eco, fast and intense programs without connection to the heat exchange tank. Then, the experiments were repeated by connecting the heat exchange tank. As a result, the amount of savings is estimated at about 57.1 kWh and its economic value is about $ 7.77 per year. The cost of the heat exchange tank and reinforcement is $ 52, and the payback period is estimated to be approximately 6.7 years. With the recovery of energy, 21.08 kg less CO2 emissions will be achieved annually.Öğe The experimental study of thermal energy recovery from shower greywater(Taylor & Francis Inc, 2021) Selimli, Selcuk; Eljetlawi, Ibrahim Ali M.Long-term savings can be achieved by small household improvements to deal with the increasing energy costs that are important to all of us. Hot shower greywater is discharged to the environment with a significant amount of thermal energy. In this study, unlike the studies in the field, the recoverability potential of the shower greywater thermal energy was experimentally studied and compared by the horizontal and vertical connection of the helical coil and brazed plate heat exchangers to a unit shower cabin. The shower water heating energy consumption of thermosiphon can be reduced by approximately 16.13% and 24.69% by mounting the helical coil heat exchanger horizontally and vertically. The saving rates reach 20.62% and 27.34% for brazed plate heat exchanger, too. It could be assessed that annual energy saving can be a minimum of 247.1 kWh and a maximum of 418.7 kWh for an average family of four people. The economic size of the saving was determined between $25.2 to $42.7, annually. The installation cost of a heat exchanger for a shower cabin is $87 and it was determined that the payback period could be 2 years. The reduction of carbon dioxide emission by the possible saving of energy is an estimated minimum of 203.85 kg/year. The study aims to contribute to the creation of literature for academic studies and design processes, as well as awareness for practitioners and investors.Öğe Feasibility study of the energy and economic gain that can be achieved by driving the boiler feedwater pump with a backpressure steam turbine(Sage Publications Ltd, 2022) Selimli, Selcuk; Sunay, SavasThe low-pressure steam requirement in the iron and steel production plant is obtained through pressure reduction stations with unrestrained expansion. In this study, the feasibility of obtaining the low-pressure steam that is needed in the plant in a backpressure turbine instead of pressure reduction stations has been studied. In this way, it is foreseen that a significant amount of wasted energy during the unrestrained expansion in pressure reduction stations, can be recovered as shaft work during the expansion process performed in the turbine. The obtained shaft work is planned to be used in the boiler feedwater pump drive. It is aimed to increase the efficiency of the system by the deactivation of boiler feedwater pump electric motors and as well as bringing the energy that is lost during the unrestrained expansion of the superheated steam to the system through the pump drive. The estimated size of energy saving of the system could be reached to 33.74%. The annual size of achievable saving has been determined by approximately 8,094,810kWh and economically $509,973. The payback period of the estimated $683,079 investment is 1.34 years. A determined amount of saving is also equivalent to the reduction of 7,285,329 kg CO2 emission, annually.Öğe Greywater heat recovery to the refill water of a dishwasher via paraffin wax and steel wool aided segmental baffle heat exchanger(Taylor & Francis Inc, 2024) Taskin, Yunus; Selimli, SelcukIn this study, the recovery of household dishwasher greywater thermal energy into dishwashing water using paraffin wax and steel wool supported segmental heat exchanger was experimentally investigated. The heat exchange performance was 40% in rapid, economy, and intensive modes and the heat recovery was 0.048, 0.031 and 0.082 kWh, respectively. Efficiency increased by 5.01%, 3.84%, and 6.5%. Time and energy were saved, and hygienic washing was accomplished by raising the washing temperature and reducing the cycle time nearly 97, 113, and 240 s. It is estimated that by using heat exchangers on 16,954,196 dishwashers in use in Turkey, small, medium, and large families can save an average of 127.366, 254.733 and 509.466 GWh per year, respectively, provided they use the three dishwasher modes equally. The annual economic size of the gain and its contribution to emission reduction in CO2 equivalents are $15.793 million, $31.586 million, $63.173 million and 112.974 kt, 225.948 kt, 451.897 kt, respectively. Energy efficiency index of dishwasher increased from 48.84 to 46.97.Öğe IMPACT OF ELECTRICAL AND MAGNETIC FIELD ON COOLING PROCESS OF LIQUID METAL DUCT MAGNETOHYDRODYNAMIC FLOW(Vinca Inst Nuclear Sci, 2018) Selimli, Selcuk; Recebli, ZiyaddinCooling period of liquid metal while flowing under imposed magnetic and electrical field was studied for laminar steady flow condition. Computational analyses were done by ANSYS Fluent software MHD module. For applied each constant value of magnetic field induction (B = 0 T, B = 0.05 T, B = 1 T), the electrical field intensity was applied positively as E+ (1e-4, 1e-5) V/m and negatively as E-(-1e-4, -1e-5) V/m. Increase of the E+ field intensity decreased the local temperature (increased cooling rate) but also increased the heat flux and Nusselt number. Also, decrease of E- in the opposite direction increased the temperature but also decreased the heat flux and Nusselt number. It could be signified that by the application of magnetic field or together with electrical field, the heat transfer could be improved or attenuated.Öğe Investigation of helical strut attached vena cava filter hemodynamic performance(Academic Publication Council, 2022) Selimli, SelcukHemodynamic performance of the Celect Platinum vena cava filter and the revised forms of it with helical flow inducer strut were studied with computational fluid dynamic software Ansys Fluent 18. The central velocity and shear stress increased but overall flow disturbance has been observed minimal level. Central velocity increases to 9.72% with Celect filter, by the single helical flow inducer strut the rate reaches to 14.69%, and with doubled form it reaches to 19.73%. The filter surface shear rate increases to 8.29% with the single helical flow inducer strut and increases 13.31% with doubled attachment. Increased velocity and shear stress on the filter may eliminate short term thrombus build-up problems by breaking the big size particulates with the high shearing forces. The new struts may also contribute to the ability of the filter to capture smaller clots, as well as to dissolve them from being bigger. Shear stress in the vein wall increases approximately 6.63% with the filter placement. It raises to 8.06% and 9.45% with single and double helical flow inducer strut attachment. Increased vein wall shear may reduce the recirculation and clotting in the vein wall and it may prevent the accumulation of clots. The increased shear stress on the filter may cause the migration problem, design improvements can minimize this risk. Helical flow inducer strut attachment can cause efficacy increase, and the flow are normalized.Öğe MHD numerical analyses of hydrodynamically developing laminar liquid lithium duct flow(Pergamon-Elsevier Science Ltd, 2015) Selimli, Selcuk; Recebli, Ziyaddin; Arcaklioglu, ErolMagnetic effects on steady state laminar liquid lithium duct flow were studied at hydrodynamically developing flow region. Studied duct model was constructed with dimensions are (15.7 x 5 x 150 mm). Model side walls were estimated conductive and top-bottom walls were defined insulated. Magnetic field applied with values are as B = 0 T, B = 0.05 T, B = 0.1 T and B = 0.15 T. Magnetic field effect was maximized by normally applying it on the flow stream. Hydrodynamic parameters are velocity, pressure, viscosity and density were numerically studied by ANSYS Fluent software MHD module. It is concluded that increase of magnetic field increased the local pressure but also decreased local velocity, density and dynamic viscosity. Obtained results compared with studies in literature and supported. Copyright (C) 2015, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.Öğe Numerical Investigation of the Effect of Surface Geometry on Bullet Aerodynamic Behaviours(Gazi Univ, 2021) Selimli, SelcukDeveloping gun systems require the studying and development of the bullets that are consumable supplies. By the improvement works in the field of materials and geometry, the production of bullets whose destroying forces, ranges, stabilization of movement and access to the target are improved was being studied. In this study, the effect of riblet and dimple formed body surface of a 9 mm parabellum type light core bullet on the aerodynamic flow behaviour around the bullet was discussed. Airflow around the bullet core was investigated by the computational fluid dynamic base software Fluent. The compressible airflow was analysed with the Spalart Allmaras turbulence flow model, considering the viscous effects due to Sutherland's law. In this study, it was concluded that the riblet and dimpled surface formed bullet geometry could lead to an increase of bullet velocity and a decrease in shear stress and drag force. It was evaluated that the dimple and riblet formed bullet surface provides positive contributions to its range as well as stabilization in bullet motion.
