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在常压条件下,对水平矩形通道内R113的流动沸腾换热过程进行了可视化实验研究.通过对加热平板上流动沸腾换热所形成的气泡形态的观测,发现随着热流密度的增大,流动沸腾的起沸点距离逐渐减小,并且减小的程度趋于平缓.随着热流密度的增大,气泡数量逐渐增多,且脱离速度也加快,气泡逐渐融合,直径逐渐变大.将本文的实验结果与文献中的对应结果进行对比,分析了流动沸腾换热中影响总体传热效果的主导因素由核态沸腾换热向强制对流换热转变。
Under normal pressure conditions, the flow boiling heat transfer process of R113 in horizontal rectangular channel was visualized.According to the bubble shape formed by the flow boiling heat transfer on the heating plate, it was found that with the increase of heat flux density, The distance from the boiling point of boiling decreases gradually and the degree of decrease tends to be gentle.With the increase of heat flux density, the number of bubbles gradually increases and the speed of detachment also increases, the bubbles gradually converge and the diameter becomes larger gradually.This paper The experimental results are compared with the corresponding results in the literature, and the dominant factors influencing the overall heat transfer in flow boiling heat transfer are analyzed from the nucleate boiling heat transfer to forced convection heat transfer.