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|Title:||7Laminar convective heat transfer for in-plane spiral coils of non-circular cross-sections ducts: A computational fluid dynamics study|
|Citation:||Kurnia, J.C., Sasmito, A.P., Mujumdar, A.S. (2012). 7Laminar convective heat transfer for in-plane spiral coils of non-circular cross-sections ducts: A computational fluid dynamics study. Thermal Science 16 (1) : 109-118. ScholarBank@NUS Repository. https://doi.org/10.2298/TSCI100627014K|
|Abstract:||The objective of this study was to carry out a parametric study of laminar flow and heat transfer characteristics of coils made of tubes of several different cross--sections e. g. square, rectangular, half-circle, triangular, and trapezoidal. For the purpose of ease of comparison, numerical experiments were carried out base on a square-tube Reynolds number of 1000 and a fixed fluid flow rate while length of the tube used to make coils of different diameter and pitch was held constant. A figure of merit was defined to compare the heat transfer performance of different geometry coils; essentially it is defined as total heat transferred from the wall to the surroundings per unit pumping power required. Simulations were carried out for the case of constant wall temperature as well as constant heat flux. In order to allow reasonable comparison between the two different boun-dary conditions - constant wall temperature and constant wall heat flux - are tested; the uniform heat flux boundary condition was computed by averaging the heat transferred per unit area of the tube for the corresponding constant wall temperature case. Results are presented and discussed in the light of the geome-tric effects which have a significant effect on heat transfer performance of coils.|
|Source Title:||Thermal Science|
|Appears in Collections:||Staff Publications|
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