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首页> 外文会议>6th international conference on nanochannels, microchannels and minichannels 2008 >EFFECT OF CHARGING AMOUNT ON EVAPORATIVE HEAT TRANSFER OF CO_2 IN A MULTI-CHANNEL MICRO TUBE
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EFFECT OF CHARGING AMOUNT ON EVAPORATIVE HEAT TRANSFER OF CO_2 IN A MULTI-CHANNEL MICRO TUBE

机译：装料量对多通道微管中CO_2的蒸发传热的影响

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摘要

Carbon dioxide has gained a great interest as a promising alternative natural refrigerant due to good thermodynamic characteristics. One of the most important factors in applying micro tube to carbon dioxide refrigeration system is refrigerant distribution. In this paper, evaporating heat transfer characteristics were experimentally investigated relating the charge of carbon dioxide in a multi-channel micro tube. The heat transfer coefficient and the pressure drop of the 6-channel aluminum tube were measured at various charges. It was found that the dryout quality and heat transfer coefficient were heavily dependent on the maldistribution of carbon dioxide. If the charge of CO_2 was not enough, maldistribution in the multi-channel micro tube became serious and a sudden drop of heat transfer coefficient was observed. These phenomena were conspicuous at high mass flux of CO_2. Also, the pressure drop was greater if the CO_2 was not properly distributed.
机译：由于良好的热力学特性，二氧化碳作为一种有前途的替代天然制冷剂引起了极大的兴趣。将微管应用于二氧化碳制冷系统的最重要因素之一是制冷剂分配。在本文中，通过实验研究了与多通道微管中的二氧化碳电荷有关的蒸发传热特性。在不同的进料量下测量6通道铝管的传热系数和压降。发现干透质量和传热系数在很大程度上取决于二氧化碳的分布不均。如果CO 2的电荷不足，则多通道微管中的分布不均会变得严重，并且会观察到传热系数的突然下降。在高质量的CO_2通量下，这些现象非常明显。另外，如果CO_2分配不当，压降会更大。

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