Two-Phase Heat Transfer and Flow Regimes in Pin Fin-Enhanced Microgaps-Effect of Pin Spacing

Pouya Asrar; S. Mostafa Ghiaasiaan; Yogendra K. Joshi

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Two-Phase Heat Transfer and Flow Regimes in Pin Fin-Enhanced Microgaps-Effect of Pin Spacing

机译：销纤维增强型微涂层的两相热传递和流量制度

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An experimental investigation of the flow boiling of dielectric refrigerant R245fa is conducted in microgaps with enhancement features. A silicon microgap of height 200 μm populated with pin fin arrays of diameter 150 μm with spacing 200 μm in both horizontal and vertical directions is examined. For five different test conditions and in a wide range of mass flux from 781 to 5210 kg/m~2s, and inlet temperatures in the range of 13-18°C, average single-phase and two-phase heat transfer coefficients, pressure drop, and exit vapor quality are reported. Three major flow patterns are observed in the pin finned area using high-speed flow visualization at frame rate of 2229 fps: foggy, bubbly, and slug flow. Based on the experimental data, a flow regime map is constructed.

机译：电介质制冷剂R245FA流沸石的实验研究用增强特征进行微吸膏。填充了直径为150μm的销翅片阵列的高度200μm的硅片微曲线，在水平和垂直方向上具有间隔200μm。对于五种不同的测试条件，在781至5210kg / m〜2s的宽范围内的质量助焊剂中，进气温度范围为13-18°C，平均单相和两相传热系数，压降报告了出口蒸气质量。使用2229 fps的帧速率的高速流动可视化在销翅片区域中观察到三个主要流动模式：有雾，起泡和块状流动。基于实验数据，构建了流动制度图。

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来源
《Journal of Heat Transfer》 |2021年第2期|023001.1-023001.9|共9页
作者
Pouya Asrar; S. Mostafa Ghiaasiaan; Yogendra K. Joshi;
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作者单位

George W. Woodruff School of Mechanical Engineering Georgia Institute of Technology Atlanta GA 30332;

George W. Woodruff School of Mechanical Engineering Georgia Institute of Technology Atlanta GA 30332;

George W. Woodruff School of Mechanical Engineering Georgia Institute of Technology Atlanta GA 30332;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);
原文格式 PDF
正文语种 eng
中图分类
关键词
two-phase flow; microgap; pin fins; refrigerant flow boiling; two-phase heat transfer; flow regime mapping;

机译：两相流;microgap;别针鳍;制冷剂流沸腾;两相热传递;流动制度映射;

Two-Phase Heat Transfer and Flow Regimes in Pin Fin-Enhanced Microgaps-Effect of Pin Spacing

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