利用流体脉动强化换热的试验研究

通过管内流体脉动的试验研究,分析脉动流体的水力参数和脉动特性对强化换热的影响规律。采用自行研制的自激振荡腔作为流体产生脉动的装置,并通过改变自激振荡腔的腔室长度和后喷嘴长度来达到调节流体脉动特性参数的目的。结果表明：流体的水力参数和自激振荡腔结构对流体脉动强化换热都有显的影响,随着流量或自激振荡腔腔室长度的增加,换热效果将增强;而后喷嘴长度则存在一个最优尺寸,在此处,换热效果最好。

Experimental study of heat transfer enhancement with pulsating flow

Pulsating flow in a pipe was experimentally investigated to determine the effect of pulsation on the rate of heat transfer. The influence of hydrodynamic parameters and pulsation properties was carefully studied. In order to adjust the pulsating parameters, a self|oscillator was designed in which the length of the resonator and the length of outlet nozzle could be adjusted. The results show that the rate of heat transfer is strongly affected by both the hydrodynamic parameters and the configuration of the resonator. With the increase of the water flow rate and the length of the chamber, the heat transfer is enhanced. And there exist an optimal length of the outlet nozzle at which the heat transfer can be enhanced nost effectivety.