Yazar "Wahhab, Hasanain A. Abdul" seçeneğine göre listele

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    Effects of nano-additives in developing alternative fuel strategy for CI engines: A critical review with a focus on the performance and emission characteristics
    (Elsevier, 2024) Hamzah, Ameer Hasan; Akroot, Abdulrazzak; Wahhab, Hasanain A. Abdul; Ghazal, Rabeea M.; Alhamd, Abdulrahman E. J.; Bdaiwi, Mothana
    Compression ignition (CI) engines are widely used in transportation and industry due to their reliability and high thermal efficiency. On the other hand, the use of CI engines coincides with the emission of harmful pollutants, and to address these problems, researchers were interested in studying the use of different types of fuel and additives, such as biodiesel, ethanol, and nanoparticles. Generally, there are increasing views that adding Nanoadditives to fuel improves the thermo physical properties and helps enhance combustion characteristics. More so, the investment of Nano-fuel additives generally leads to premature combustion and accelerated ignition of the fuel charge inside the engine cylinder. What's more, the optimal amount of Nano fuel additives is associated with improvements in ignition characteristics and reduced exhaust emissions. This review concentrated on recent advancements in the use of nanoparticles, specifically different types from Nanoparticles, as a diesel fuel additive, including experimental and theoretical analyses. This study's findings can contribute to the development of a more efficient and environmentally friendly diesel engine technology. Finally, potential mechanisms underlying improvements in diesel properties and combustion are also reviewed and discussed.
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    Enhancement Heat exchanger performance by insert dimple surface ball inside tubes: A review
    (Elsevier, 2023) Bdaiwi, Mothana; Akroot, Abdulrazzak; Wahhab, Hasanain A. Abdul; Assaf, Younus Hamoudi; Nawaf, Mohammed Y.; Talal, Wadah
    In this review, it provides a thorough analysis of the information for boils impact not only the rate of heat transfer but also the degree to which the flow is separated. Minor hazards that are printed on a smooth surface and used as a benchmark to determine the surface's degree of roughness are called passages. The number of dynamic masses that deceiving bodies must con-tend with. Recent studies have shown that boils inside the tubes can help decrease the trouble-some friction that the paintwork experiences. This is accomplished by lowering the conflict generated by the epidermis, which in turn substitutes clouds for the pressure brought on by boils, ultimately resulting in a worldwide advantage. It has yet to be determined in a manner that can be regarded as definitive whether or not the bumps are beneficial in lowering the amount of friction and vapours produced. More so, This article explains several factors that contribute to understanding contradictory information that can be found in the researches, also it provide some recommendations for future research by calling attention to essential sys-tematic techniques that are required to make a meaningful comparison between a smooth surface and one that has boiled in connection to the elimination of clouds.
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    NUMERICAL ANALYSIS OF THE STEAM TURBINE PERFORMANCE IN POWER STATION WITH A LOW POWER CYCLE
    (Taylors Univ Sdn Bhd, 2023) Bdaiwi, Mothana; Akroot, Abdulrazzak; Wahhab, Hasanain A. Abdul; Mahariq, Ibrahim
    In this paper, an analysis of the temperature and quantity balance of the thermal power plant for the Al-Dura (K-160-13.34-0.0068) station was first studied and used for reference. This work describes a possible way to build a simulation model of the most important parts of power plant Al-Dura (K-160-13.34-0.0068). The Cycle-Tempo and MATLAB/Simulink packages are used to model the energetic and exergetic analysis of the power plant. MATLAB/Simulink software was used to simulate the behaviour of a Steam turbine with high-pressure, intermediate-pressure, and low-pressure steam, with a load response in a stable circumstance over a range of 50% to 100%. The model is based on Stodol's law and simulates the pressure and enthalpy alongside the dissimilar turbine phases and the vapor and water extraction. The effect of the vapor and water extraction on the turbine is also elucidated. Areas of essential energy loss and exergy decimation will be resolved. The impact of changing the power plant load on the exergy analysis is determined. The response of suggested purposes to estimate these vapor properties is compared with standard data and showed high accuracy (the modelling error is less than 0.01%).
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    NUMERICAL SIMULATION OF A POROUS MEDIA SOLAR COLLECTOR INTEGRATED WITH THERMAL ENERGY STORAGE SYSTEM
    (Taylors Univ Sdn Bhd, 2023) Nawaf, Mohammed Y.; Akroot, Abdulrazzak; Wahhab, Hasanain A. Abdul
    Increasing the contact area between the working fluid and solid surface is proven to be a successful technique for enhanced heat transfer. This paper presents computational simulation results of a closed active solar water heating system. The system is a novel solar water heating as it is compacted with a heat transfer unit filled with an open cell foam porous media for increased heat transfer area and molten salts of 60% sodium nitrate and 40% potassium nitrate as phase change material. Water is circulated between the collector and a storage tank. The numerical simulation and analysis were performed using ANSYS FLUENT 17.0, assuming a steady, incompressible, and 3D state. The system performance was tested using two flow rates of the circulating water of 2.5 and 3.5 l/min. Numerical results showed that the temperature difference between the inlet and outlet decreases with increasing water flow rates through the solar water heater. The temperature difference decreased by 11.5% when the flow rate increased from 2.5 to 3.5 l/min. Also, the results showed a good prediction of the real flow behaviour inside the thermal energy storage. Also, the evolution of the numerical simulation accuracy for porous media solar collector analysis is still a topic of future research.
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    PREDICTION OF PREMIXED FLAMES CHARACTERISTICS OF LIQUEFIED PETROLEUM GAS (LPG) / HYDROGEN GAS MIXTURES
    (Taylors Univ Sdn Bhd, 2023) Ghazal, Rabeea M.; Akroot, Abdulrazzak; Wahhab, Hasanain A. Abdul
    The laminar burning velocities of liquid petroleum gas (LPG)-hydrogen-air mixtures are emphasized. They play a crucial role in designing and predicting combustion progress and the performance of combustion systems that utilize hydrogen as fuel. This work uses laminar burning velocities of different compositions of Iraqi LPG-hydrogen-air mixtures (4 and 10 vol.%). The measurements have been taken at ambient temperature and pressure for various equivalence ratios (phi = 0.21 to 1.23). A counter combustor with a symmetrical premixed flame is suggested to enhance stability efficiency and temperature distribution and improve heat transfer with hydrogen gas addition at different percentages. The results have been demonstrated by an increase in the hydrogen concentration within hydrogen-LPG mixtures (0, 4, and 10%vol. of hydrogen) leads to a significant increase in both flame temperature (1070, 1100, and 1154 K) and burning velocities (26.7, 33 and 49.5 cm/s) respectively. Adding hydrogen to LPG makes it an excellent substitute for hydrocarbon fuels since it provides a stable flame and a large explosive area.