Shiraz University Iranian Journal of Science and Technology Transactions of Mechanical Engineering 2228-6187 39 M2 2015 10 01 EXPERIMENTAL INVESTIGATION OF TRANSIENT TEMPERATURE DISTRIBUTION AND HEAT TRANSFER BY JET IMPINGEMENT IN GLASS TEMPERING PROCESSING 337 349 3244 10.22099/ijstm.2015.3244 EN H. Yazici Dept. of Automotive Engineering, Technology Faculty, Pamukkale University, Denizli, Turkey M. Akcay 2Dept. of Mechanical Education, Technical Education Faculty, Pamukkale University, Denizli, Turkey M. Golcu Dept. of Automotive Engineering, Technology Faculty, Pamukkale University, Denizli, Turkey M.F. Koseoglu Dept. of Mechanical Engineering, Engineering Faculty, Pamukkale University, Denizli, Turkey Y. Sekmen Dept. of Automotive Engineering, Engineering Faculty, Karabuk University, Karabuk, Turkey Journal Article 2014 10 15 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 ºC in the furnace and was then exposed to sudden cooling process until its surface temperature dropped to 70 ºC. 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 (Nux), average (Nuaver) and stagnation point (Nustag) Nusselt numbers have been experimentally determined. https://ijstm.shirazu.ac.ir/article_3244_ce443a5dab89f5f00aaf2b9cf03888ea.pdf