A study of heat transfer through the heavy plate thickness under multi-slit jet impingement

• Published in: Heat and mass transfer Vol. 56; no. 2; pp. 663 - 670
• Main Authors: Wang, Bingxing, Xia, Yue, Liu, Zhixue, Wang, Zhaodong, Wang, Guodong
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01.02.2020; Springer Nature B.V
• Subjects: Conduction cooling; Conduction heating; Conductive heat transfer; Cooling; Cooling curves; Cooling rate; Engineering; Engineering Thermodynamics; Flow velocity; Heat and Mass Transfer; Heat flux; Heat transfer; Heat transfer coefficients; Industrial Chemistry/Chemical Engineering; Jet impingement; Metal plates; Nozzles; Original; Synchronism; Temperature; Temperature gradients; Thermodynamics; Thickness
• ISSN: 0947-7411; 1432-1181
• DOI: 10.1007/s00231-019-02738-3

The influence of cooling models and moving velocity on the temperature variation and cooling rate through the thickness of a metal plate is experimentally investigated. In this investigation, the cooling process is divided into four stages: a starting stage (I), a rapid cooling stage (II), a slow cooling stage (III) and a stopping stage (IV). Based on the curves, cooling rate, temperature difference, the heat transfer coefficient and center temperature curves are discussed. The results indicate that the cooling model and moving velocity influence the heat transfer on the surface, and affects the cooling rate through the thickness by changing the temperature difference. When the flow rates of nozzles 1, 2 and 3 are set to be V 1 , V 2 and V 3 respectively, the highest heat transfer is observed when V 1  > V 2  > V 3 . Under this cooling model, the maximum temperature difference occurs at the time of transition from the rapid cooling stage (II) to the slow cooling stage (III). In the slow cooling stage (III), increased moving velocity improves the synchronization of the heat transfer and decreases the maximum heat flux. As well, the speed of motion affects the internal heat conduction and cooling rate by affecting surface heat transfer.