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EFFECT OF SURFACE ROUGHNESS ON UNSTEADY IMPINGING JET HEAT TRANSFER CHARACTERISTICS
Author(s): 
Pages: 687-690
Year: Issue:  4
Journal: Journal of Engineering Thermophysics

Keyword:  粗糙表面非定常冲击射流传热特性圆环高度;
Abstract: 利用在射流驻点周围设置不同高度的圆环来模拟粗糙表面,进行非定常射流冲击换热的实验研究.非定常射流由一个特殊的质量流量控制装置产生,波形和频率可调.采用高度分别为1 mm,2 mm和3 mm的圆环,研究发现环高h=3 mm时,冲击射流流场发生了实质性的改变.对于流动形态没有发生实质改变的粗糙表面,在稳定射流冲击下,传热特性没有质的变化.然而,非定常射流冲击粗糙表面时,与其冲击光滑平板相比,传热特征有...
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