Effect of fluid thermal properties on the heat transfer characteristics in a double-pipe helical heat exchanger

被引:26
作者
Rennie, Timothy J. [1 ]
Raghavan, Vijaya G. S. [1 ]
机构
[1] McGill Univ, Dept Bioresource Engn, Ste Anne De Bellevue, PQ H9X 3V9, Canada
基金
加拿大自然科学与工程研究理事会;
关键词
double-pipe; heat exchanger; dean number; laminar flow; Prandtl number;
D O I
10.1016/j.ijthermalsci.2006.02.004
中图分类号
O414.1 [热力学];
学科分类号
摘要
Heat transfer characteristics of a double-pipe helical heat exchanger were numerically studied to determine the effect of fluid thermal properties on the heat transfer. Two studies were performed; the first with three different Prandtl numbers (7.0, 12.8, and 70.3) and the second with thermally dependent thermal conductivities. Thermal conductivities of the fluid were based on a linear relationship with the fluid temperature. Six different fluid dependencies were modeled. Both parallel flow and counterflow configurations were used for the second study. Results from the first study showed that the inner Nusselt number was dependent on the Prandtl number, with a greater dependency at lower Dean numbers; this was attributed to changing hydrodynamic and thermal entry lengths. Nusselt number correlations based on the Prandtl number and a modified Dean number are presented for the heat transfer in the annulus. Results from the second part of the study showed that the Nusselt number correlated better using a modified Dean number. The counterflow configuration had higher heat transfer rates than the parallel flow, but the ratio of these differences was not different when comparing thermally dependent properties and thermally independent properties. (C) 2006 Elsevier Masson SAS. All fights reserved.
引用
收藏
页码:1158 / 1165
页数:8
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