用实验的方法以水为介质研究了同轴换热器的流动与传热，Re范围为30000到100000。研究表明管内摩擦阻力系数是相同情况下圆管的4到5倍，总体传热系数随管内Re的增大而增大，当Re较大时提高壳侧速度对换热性能的提升更有利。采用数值模拟的方法分别研究了同轴换热器整体的换热与流动，且和实验结果进行了比较，研究表明，受离心力的影响流体在管内产生了掺混流动，掺混流动的程度随螺距的减小而加剧，增加槽深减少了参与掺混的流体量，流体之间的掺混对换热具有积极的影响。
The heat transfer and pressure drop in coaxial spiral tube to tube heat exchanger has been studied by experiment methods and using water as medium with Reynold range from 30000 to 10000. Experiment research was carried out on two tubes with different helical pitch for their frictional resistance and heat transfer performance.The study shows that the tube frictional resistance eoemeient of coaxial spiral tube to tube heat exchanger is 4 to 5 times as large as circular tube exchanger. The flow field characteristics outside and inside the coaxial spiral tube to tube heat exchanger tubes were investigated using numerical methods. The results have been compared to experimental tests. Studies have shown that mixing flow has been generated by centrifugal force,the degree of mixing flow decreases with increasing pitch, increasing groove depth reduced the amount of fluid in the mixing fluid. The mixing between the fluid has a positive impact on the heat transfer enhancement.
参考文献
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| [2] | S. Rozzi;R. Massini;G. Paciello;G. Pagliarini;S. Rainieri;A. Trifiro .Heat treatment of fluid foods in a shell and tube heat exchanger: Comparison between smooth and helically corrugated wall tubes[J].Journal of Food Engineering,2007(1):249-254. |
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