Effect of Nozzle Exit to Surface Spacing on theCooling of Electrically Heated Surface with JetImpingement

International Journal of Advanced Research in Electrical, Electronics and Instrumentation Engineering

article

Chitranjan Agarwal¹  J. K. Maherchandani¹  Mukesh Sahi² 

[1] College of Tech. & Engg.;Govt. Polytechnic College

关键词: Jet impingement;    stagnation point;    transient cooling;    heat transfer;   

来源: Research & Reviews

【 摘 要 】

The transient surface cooling of a hot stainless steel surface is obtained by a water jet impingement cooling method. The surface is electrically heated up to the initial temperature of 800 C. Water flow rate is kept constant so that jet Reynolds number remains at Re=24000. Nozzle exit to surface spacing has been changed in a range of z/d = 4-16. For larger surface temperature drop change in nozzle exit to surface spacing does not affect the surface cooling time significantly. However, for lesser surface temperature drop particularly at higher range of surface temperature, surface cooling time is approximately 15 % higher with z/d =4.

【 授权许可】

Unknown