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首页> 外文期刊>International Journal of Multiphase Flow >Small circular- and rectangular-channel boiling with two refrigerants
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Small circular- and rectangular-channel boiling with two refrigerants

机译：使用两种制冷剂的小圆形和矩形通道沸腾

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摘要

Boiling heat transfer experiments were performed in a small circular channel (d = 2.46) and a small rectangular channel (dh = 2.40 mm) with Refrigerant 12. The channel sizes are representative of flow passages in compact evaporators. An experimental technique minimized test section end effects which can be appreciable relative to the heat transfer in these small channels. Local heat transfer results were obtained over a range of qualities up to 0.94, a mass flux range of 44–832 kg/m's, and a heat flux range of 3.6–129 kW/m2. Saturation pressure was nearly constant, averaging 0.82 MPa for most of the testing, with some tests performed at a lower pressure of 0.51 MPa. Local heat transfer coefficients were determined experimentally as a function of quality along the length of the test section. Heat transfer rates were compared with results of previous experiments in which Refrigerant 113 in a 2.92-mm diameter small circular tube was used. The effects of channel geometry and fluid properties on heat transfer, as well as insights relative to heat transfer mechanisms in small channels, are presented. Results are presented for both nucleation- (wall superheat above 2.75°C) and convection-dominant boiling heat transfer regimes and compared with large-channel predictions. The heat transfer data for the two fluids were successfully correlated in the nucleation-dominant region.
机译：在带有制冷剂12的小圆形通道（d = 2.46）和小矩形通道（dh = 2.40 mm）中进行沸腾传热实验。通道尺寸代表紧凑型蒸发器中的流道。实验技术可以最大程度地减小测试段的末端影响，这相对于这些小通道中的热传递而言是可观的。在高达0.94的质量范围，44-832 kg / m's的质量通量和3.6-129 kW / m2的热通量范围内获得了局部传热结果。饱和压力几乎恒定，在大多数测试中平均为0.82 MPa，有些测试在0.51 MPa的较低压力下进行。沿着实验区域的长度，通过实验确定了局部传热系数与质量的关系。将传热速率与先前实验的结果进行了比较，在先前实验中，使用了直径2.92毫米的小圆形管中的制冷剂113。介绍了通道几何形状和流体性质对传热的影响，以及有关小通道传热机理的见解。给出了成核（高于2.75°C的壁过热）和以对流为主的沸腾传热方式的结果，并与大通道预测结果进行了比较。两种流体的传热数据已成功地在成核主导区域相关。

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