Numerical investigation of heat transfer in annulus laminar flow of multi tubes-in-tube helical coil

被引：0
|
作者：
S. A. Nada
H. F. Elattar
A. Fouda
H. A. Refaey
机构：
[1] Benha University,Department of Mechanical Engineering, Benha Faculty of Engineering
[2] Mansoura University,Department of Mechanical Power Engineering, Faculty of Engineering
[3] Benha University,Department of Mechanical Engineering, Faculty of Engineering at Shoubra
来源：
Heat and Mass Transfer | 2018年 / 54卷
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摘要：
In the present study, a CFD analysis using ANSYS-FLUENT 14.5 CFD package is used to investigate the characteristics of heat transfer of laminar flow in annulus formed by multi tubes in tube helically coiled heat exchanger. The numerical results are validated by comparison with previous experimental data and fair agreements were existed. The influences of the design and operation parameters such as heat flux, Reynolds numbers and annulus geometry on the heat transfer characteristics are investigated. Different annulus of different numbers of inner tubes, specifically 1, 2, 3, 4 and 5 tubes, are tested. The Results showed that for all the studied annulus, the heat flux has no effect on the Nusselt number and compactness parameter. The annulus formed by using five inner tubes showed the best heat transfer performance and compactness parameter. Correlation of predicting Nusselt number in terms of Reynolds number and number of inner tubes are presented.
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页码：715 / 726
页数：11
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