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 effects of the eccentricity ratio and modulation frequency on the heat-transfer rate are analyzed by numerically solving the 3D convection-diffusion 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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Heat-Transfer Enhancement by Chaotic Advection in the Eccentric Helical Annular Flow
José P. B. Mota,
José P. B. Mota
Requimte∕CQFB, Departamento de Química, Faculdade de Ciências e Tecnologia,
Universidade Nova de Lisboa
, 2829-516 Caparica, Portugal
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António J. S. Rodrigo,
António J. S. Rodrigo
Requimte∕CQFB, Departamento de Química, Faculdade de Ciências e Tecnologia,
Universidade Nova de Lisboa
, 2829-516 Caparica, Portugal
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Estéban Saatdjian
Estéban Saatdjian
LEMTA
, 2 Avenue de la Forêt de Haye, BP 160, 54504 Vandœuvre Cédex, France
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José P. B. Mota
Requimte∕CQFB, Departamento de Química, Faculdade de Ciências e Tecnologia,
Universidade Nova de Lisboa
, 2829-516 Caparica, Portugal
António J. S. Rodrigo
Requimte∕CQFB, Departamento de Química, Faculdade de Ciências e Tecnologia,
Universidade Nova de Lisboa
, 2829-516 Caparica, Portugal
Estéban Saatdjian
LEMTA
, 2 Avenue de la Forêt de Haye, BP 160, 54504 Vandœuvre Cédex, FranceJ. Heat Transfer. Feb 2008, 130(2): 024501 (5 pages)
Published Online: February 4, 2008
Article history
Received:
July 6, 2006
Revised:
May 2, 2007
Published:
February 4, 2008
Citation
Mota, J. P. B., Rodrigo, A. J. S., and Saatdjian, E. (February 4, 2008). "Heat-Transfer Enhancement by Chaotic Advection in the Eccentric Helical Annular Flow." ASME. J. Heat Transfer. February 2008; 130(2): 024501. https://doi.org/10.1115/1.2787023
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