Experimental investigation on downward flow boiling heat transfer characteristics of propane in shell side of LNG spiral wound heat exchanger
Experimental investigation on downward flow boiling heat transfer characteristics of propane in shell side of LNG spiral wound heat exchanger
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DOI：
10.1016/j.ijrefrig.2017.08.006
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发表时间：
2017-12
期刊：
影响因子：
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通讯作者：
Chao Ding;Haitao Hu;G. Ding;Jie Chen;X. Mi;Sicong Yu;Liu Jianrui
中科院分区：
文献类型：
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作者：
Chao Ding;Haitao Hu;G. Ding;Jie Chen;X. Mi;Sicong Yu;Liu Jianrui
LNG螺旋缠绕换热器的设计需要了解两相烃类制冷剂在壳侧向下流动的沸腾换热机理。在本研究中，建立了一个防爆实验装置，用于测量传热系数（HTC）和观察流动模式。试验段包含三层管束，以模拟SWHE的实际结构和流动状况。丙烷作为壳体侧制冷剂的主要成分之一，被用作测试流体。实验条件为热通量4~10 kW·m−2，质量通量40~80 kg (m2·s)−1，蒸汽质量0.2~1.0。结果表明：随着蒸汽质量的增加，HTC先增大后减小，在蒸汽质量为0.8~0.9时达到最大值；热流密度对HTC的影响随热流密度的增大而增大。在±20%的偏差范围内，建立了覆盖98%实验数据的HTC相关性。
For designing LNG spiral wound heat exchangers (SWHE), the boiling heat transfer mechanism of two-phase hydrocarbon refrigerant flowing downward in shell side should be known. In this study, an explosion-proof experimental rig was established for measuring heat transfer coefficients (HTC) and observing flow patterns. The test section contains three-layer tube bundles to emulate the actual structure and flow conditions of an SWHE. Propane as one main component of shell-side refrigerant is used as the tested fluid. The experimental conditions cover heat fluxes of 4~10 kW⋅m−2, mass fluxes of 40~80 kg (m2⋅s)−1and vapor qualities of 0.2~1.0. The results indicate that HTC initially increases and then decreases with the increment of vapor quality, representing a maximum at a vapor quality of 0.8~0.9; the effect of heat flux on HTC increases with the increment of heat flux. A correlation of HTC was developed covering 98% of the experimental data within a deviation of ±20%.