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多孔介质期刊
影响因子: 1.49 5年影响因子: 1.159 SJR: 0.504 SNIP: 0.671 CiteScore™: 1.58

ISSN 打印: 1091-028X
ISSN 在线: 1934-0508

多孔介质期刊

DOI: 10.1615/JPorMedia.v11.i7.10
pages 617-632

Numerical Modeling of Turbulent Flow in an Annular Heat Exchanger Partly Filled with a Porous Substrate

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
USTHB, Faculty of Mechanical and Process Engineering, LTPMP, Alger 16111, Algeria

ABSTRACT

Computations are performed for a turbulent flow with the modified kε model in a double- pipe heat exchanger with a porous substrate in the annular gap attached to the inner cylinder. A proposal model for approximating the Forchheimer terms in the equations of turbulent kinetic energy and dissipation is developed by time averaging the general macroscopic transport equations. Numerical predictions are obtained using a finite volume method to investigate the turbulent fluid flow and heat transfer characteristics. Parameters such as the Reynolds number, the porous layer thickness, the permeability, and the thermal conductivity ratio are varied to asses their effects. The results show that the permeability has a great influence on turbulence intensity that goes by a maximum value at a certain Darcy number, and the efficiency of the heat exchanger is noticeably improved for a highly conducting porous substrate.


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