Boiling Heat Transfer and Pressure Drop of a Refrigerant Flowing in a Vertical Small Diameter Tube
Boiling Heat Transfer and Pressure Drop of a Refrigerant Flowing in a Vertical Small Diameter Tube
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垂直小直径管内制冷剂流动的沸腾传热和压降
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
Y. Hamamoto
中科院分区：
文献类型：
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作者：
K. Miyata;H. Mori;K. Ohishi;Y. Hamamoto
在本研究中，进行了实验以检查在内径为 1.0 mm 的垂直铜光滑管中流动的制冷剂 R410A 的流动沸腾传热和压降特性。在蒸发温度为10℃时，在质量通量30至200 kg/(m 2 ·s)、热通量1至16 kW/m 2 和品质0至1的范围内测量局部传热系数。还在质量流量为100和200 kg/(m 2 ·s)的向上流以及30、50、100和200 kg/(m 2 ·s)的质量流量下测量了向下流的压降，质量为0.1至0.9。在管内观察到三种类型的流型：段塞流、段塞环流和环形流。根据测量结果，阐明了摩擦压降、传热系数和干燥质量的特性。
In the present study, experiments were performed to examine characteristics of flow boiling heat transfer and pressure drop of a refrigerant R410A flowing in a vertical copper smooth tube with 1.0 mm inside diameter. Local heat transfer coefficients were measured in a range of mass fluxes from 30 to 200 kg/(m 2 ·s), heat fluxes from 1 to 16 kW/m 2 and qualities from 0 to 1 at evaporation temperature of 10°C. Pressure drops were also measured at mass fluxes of 100 and 200 kg/(m 2 ·s) for upward flow and of 30, 50, 100 and 200 kg/(m 2 ·s) for downward flow and qualities from 0.1 to 0.9. Three types of flow pattern were observed in the tube: A slug, a slug-annular and an annular flow. Based on the measurements, the characteristics of frictional pressure drop, heat transfer coefficient and dryout qualities were clarified.