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首页> 外文会议>4th International Conference on Nanochannels, Microchannels and Minichannels 2006(ICNMM2006) pt.A >HEAT TRANSFER MECHANISM AND FLOW PATTERN DURING FLOW BOILING OF WATER IN A VERTICAL NARROW CHANNEL - EXPERIMENTAL RESULTS
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HEAT TRANSFER MECHANISM AND FLOW PATTERN DURING FLOW BOILING OF WATER IN A VERTICAL NARROW CHANNEL - EXPERIMENTAL RESULTS

机译：垂直窄通道水沸腾时的传热机理和流动规律-实验结果。

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摘要

Experimental investigations on flow boiling phenomena in a vertical narrow rectangular microchannel with the hydraulic diameter d_h= 0.48 mm were carried out. The experiments were performed under fluid-inlet subcooling conditions with de-ionised and degassed water for different mass fluxes. Investigations on pressure drop and heat transfer during single-and two-phase flow have been carried out. Moreover, flow visualisation of the two-phase flow patterns along the channel was performed using a digital high-speed video camera.rnThe present work outlines local heat transfer coefficients for three mass fluxes (200, 700 and 1500 kg/m~2s) and heat fluxes (30 - 110, 35 - 150 and 65 - 200 kW/m~2, respectively) during two-phase flow. The fluid temperature at the inlet was about 50 ℃ what corresponds to inlet subcooling, depending on flow pressure conditions, from 34 ℃ to 57 ℃. The visual observations were used to obtain a better insight about the heat transfer mechanism.
机译：对水力直径d_h = 0.48 mm的垂直窄矩形微通道中的沸腾现象进行了实验研究。实验是在流体入口过冷条件下用去离子和脱气水针对不同的质量通量进行的。已经研究了单相和两相流中的压降和传热。此外，使用数字高速摄像机对沿通道的两相流场进行了流动可视化.rn本工作概述了三种质量通量（200、700和1500 kg / m〜2s）的局部传热系数，以及两相流期间的热通量（分别为30-110、35-150和65-200 kW / m〜2）。入口处的流体温度约为50℃，对应于入口过冷，取决于流动压力条件，从34℃到57℃。视觉观察用于获得关于传热机理的更好的见解。

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