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ICHMT DIGITAL LIBRARY ONLINE

ISSN 961-91393-0-5

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Year 2004

• 3Thermal Sciences 2004
Proceedings of The ASME - ZSIS International Thermal Science Seminar II, Bled, Slovenia, June 13-16, 2004

1032 pages

Volume price - $246.00

Thermodynamic Analysis in a Partly Porous Annular Heat Exchanger

Nadia Allouache
Faculté de Génie Mécanique et de Génie des Procédés Université des Sciences et de la Technologie Houari Boumedienne, B. P. 32 EL Alia, Bab Ezzouar 16111, Algeria

Salah Chikh
Faculté de Génie Mécanique et de Génie des Procédés Université des Sciences et de la Technologie Houari Boumedienne, B. P. 32 EL Alia, Bab Ezzouar 16111, Algeria

ABSTRACT

The entropy generation due to heat transfer and to fluid friction has been analyzed for an annular heat exchanger partly or fully filled with a porous medium. The porous medium is attached to the inner cylinder, which is heated with a hot fluid while the outer cylinder is adiabatic. The objective of this study is to find the best conditions in order to minimize pressure drop, to enhance heat transfer and to reduce entropy generation. The effect of several parameters such as the thickness of the porous substrate, its permeability and its thermal conductivity are investigated. The numerical predictions show the existence of a critical thickness which depends on inlet conditions and the permeability of the porous layer. Beyond this thickness, the entropy generation decreases. Moreover, an increase in the effective thermal conductivity of the porous medium seems to be thermodynamically more advantageous.