Heat transfer characteristics of an annular turbulent impinging jet with a confined wall measured by thermosensitive liquid crystal

被引：0
作者：
Koichi Ichimiya
机构：
[1] Department of Mechanical System Eng., Yamahashi University, Kofu, Yamanashi 400-8511
来源：
Heat and Mass Transfer | 2003年 / 39卷 / 7期
关键词：
Heat Flux; Nusselt Number; Nozzle Exit; Heat Transfer Characteristic; Local Nusselt Number;
D O I：
10.1007/s00231-002-0371-2
中图分类号：
学科分类号：
摘要：
The present paper describes the heat transfer characteristics of an annular turbulent impinging jet with a confined wall. The local temperature distribution on the impingement surface was measured using a thermosensitive liquid crystal sheet and an image processor. The net heat flux was evaluated by considering the heat conduction in the heated substrate and the thermal radiation between an upper confining insulated wall and an impingement surface. Distributions of the temperature and Nusselt number on the impingement surface were captured in two-dimensional maps. Effects of the diameter ratio of the annular nozzle, the space between nozzle and impingement surface and the Reynolds number on radial distributions of the local Nusselt number were examined. Experimental formulas of the local Nusselt number were obtained in power-law expressions of r/rp for the major and minor flow regions.
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页码：545 / 551
页数：6
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