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    Experimental investigation of cooling with multiple air jets on auto glass tempering
    (2012) Gölcü, M.; Yazici, H.; Akçay, M.; Köseoglu, M.F.; Sekmen, Y.
    Impinging air jets due to their high heat and mass transfer capacity are widely used for heating, cooling and drying applications in nowadays industry. This study aims to investigate auto glass tempering project. Heat transfer characteristics of heated glass plates during their cooling with mutually placed circular air jets have been experimentally investigated. 4 mm thick glass samples were used in the experiments. Cooling process has been performed with 16 mutually placed nozzles of 8 mm in diameter and 80 mm in length in staggered arrangement. Nozzles were made of seamless aluminum pipes. Experiments have been conducted for dimensionless jet to plate distances (H/D) between 1 and 10, and S/D ratios which represents dimensionless distance between nozzle axis, for 2?S/D?10. Reynolds number has been fixed at 30000 for all experiments. According to the results the highest average Nusselt number (Num) has been achieved for S/D=2 and H/D=4 with a value 123.3 and the lowest average Nusselt number was obtained for S/D=10 and H/D=10 with a value 58.6.
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    EXPERIMENTAL INVESTIGATION OF TRANSIENT TEMPERATURE DISTRIBUTION AND HEAT TRANSFER BY JET IMPINGEMENT IN GLASS TEMPERING PROCESSING
    (Springer, 2015) Yazici, H.; Akcay, M.; Golcu, M.; Koseoglu, M. F.; Sekmen, Y.
    Heating and sudden cooling are among the most important processes affecting temper quality in the production period of tempered auto glass. In this study, heat transfer characteristics and cooling times during the sudden cooling process of tempered glass production have been experimentally investigated. Flat glass with dimensions of 50x50x4 mm has been heated up to 680 degrees C in the furnace and was then exposed to sudden cooling process until its surface temperature dropped to 70 degrees C. In the cooling process two mutually placed 8 cm long air jet nozzles with an internal diameter of 8 mm have been used. Experiments have been conducted for Reynolds numbers in the range of (20000 <= Re <= 40000) and for dimensionless jet to plate distances in the range of (1 <= H/D <= 10). Based on the above parameters cooling periods, local (Nu(x)), average (Nu(aver)) and stagnation point (Nu(stad))Nusselt numbers have been experimentally determined.
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    Experimental investigation of transient temperature distribution and heat transfer by jet impingement in glass tempering processing
    (Shiraz University, 2015) Yazici, H.; Akcay, M.; Golcu, M.; Koseoglu, M.F.; Sekmen, Y.
    Heating and sudden cooling are among the most important processes affecting temper quality in the production period of tempered auto glass. In this study, heat transfer characteristics and cooling times during the sudden cooling process of tempered glass production have been experimentally investigated. Flat glass with dimensions of 50x50x4 mm has been heated up to 680 °C in the furnace and was then exposed to sudden cooling process until its surface temperature dropped to 70 °C. In the cooling process two mutually placed 8 cm long air jet nozzles with an internal diameter of 8 mm have been used. Experiments have been conducted for Reynolds numbers in the range of (20000le;Rele;40000) and for dimensionless jet to plate distances in the range of (1le;H/Dle;10). Based on the above parameters cooling periods, local (Nux), average (Nuaver) and stagnation point (Nustag) Nusselt numbers have been experimentally determined. © Shiraz University.