窄环隙内强迫流动阻力特性的实验研究

Experimental Study on Forced Water Flow Resistance in Narrow Annulus

鉴于流体在小尺度流道内流动时所表现出的特殊性,对水在竖直环隙内受迫流动状况下单相对流换热时的流动阻力特性进行了实验研究。实验结果表明,雷诺数在900～1100时流态便开始向紊流转变,摩擦阻力压降的大小与加热方式和换热温差的关系很小,而主要取决于质量流速和环隙宽度比值的大小。

Considering the special resistance characteristics of fluids flowing through ducts with small gap sizes, experiments are performed to study the resistance characteristics of single-phase water, which is forced to flow through vertical annuli. The results show that the transition to turbulent flow is initiated at Reynolds number of 900～1100, and the flow resistance in annulus has little relations with the temperature difference and heated modes, but mainly depends on the ratio of mass velocity to the width of annulus.