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Experimental study of unsteady convective boiling in heated minichannels

机译:加热小通道内非定常对流沸腾的实验研究

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Convective boiling in narrow channels may under specific conditions display an unsteady behavior. An experimental set-up has been elaborated to investigate heat and mass transfer and to analyze two-phase flow instabilities in rectangular microchannels with a hydraulic diameter of 889 μm. Depending on the operating conditions two types of behavior are observed: a steady state characterized by pressure drop fluctuations with low amplitudes (from 0.5 to 5 kPa/m) and no characteristic frequency; a non-stationary state of two-phase flow. The pressure signals exhibit fluctuations with high amplitudes (from 20 to 100 kPa/m) and frequencies ranging from 3.6 to 6.6 Hz. Steady and unsteady thermo-hydraulic behaviors depending on the two control parameters (heat flux and mass velocity) are analyzed and given in this paper.
机译:狭窄通道中的对流沸腾在特定条件下可能会表现出不稳定的行为。精心设计了一个实验装置,以研究传热和传质并分析水力直径为889μm的矩形微通道中的两相流动不稳定性。根据操作条件,可观察到两种类型的行为:一种稳定状态,其特征在于压降波动幅度小(0.5至5 kPa / m),并且没有特征频率;两相流的非平稳状态。压力信号表现出高幅度的波动(从20到100 kPa / m),频率范围从3.6到6.6 Hz。本文分析并给出了取决于两个控制参数(热通量和质量速度)的稳态和非稳态热工液压行为。

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