Heat-transfer enhancement by chaotic advection in the eccentric helical annular flow

被引：4
|
作者：
Mota, Jose P. B. [1 ]
Rodrigo, Antonio J. S. [1 ]
Saatdjian, Esteban [2 ]
机构：
[1] Univ Nova Lisboa, Fac Ciencias & Tecnol, Dept Quim, Requimte CQFB, P-2829516 Caparica, Portugal
[2] LEMTA, F-54504 Vandoeuvre Les Nancy, France
来源：
JOURNAL OF HEAT TRANSFER-TRANSACTIONS OF THE ASME | 2008年 / 130卷 / 02期
关键词：
eccentric helical annular flow; chaotic advection; heat transfer; mixing;
D O I：
10.1115/1.2787023
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
Chaotic advection in the eccentric helical annular heat exchanger is investigated as a means to enhance its thermal efficiency. Chaotic streak lines are generated by steadily rotating one boundary while the other is counter-rotated with a time-periodic angular velocity. The affects of the eccentricity ratio and modulation frequency on the heat-transfer rate are analyzed by numerically solving the 3D convection-diflusion equation for a broad range of parameter values. For the frequency range over which chaotic advection can be effectively promoted, the efficiency of the heat exchanger is enhanced over that obtained for steady boundary rotation. Other tools, such as stretching field calculations and streak-line plots, applicable for dissipative dynamical systems, are implemented. These tools qualitatively confirm the quantitative heat-transfer results obtained.
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页数：5
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