Library Subscription: Guest
ICHMT DL Home Current Year Archives Executive Committee International Centre for Heat and Mass Transfer

Numerical Study on Effective Conductivity due to Thermal Dispersion in Periodic Porous Media

DOI: 10.1615/ICHMT.2004.IntThermSciSemin.1040
pages 831-842

J. Y. Xu
Department of Engineering, University of Cambridge, Trumpington Street, Cambridge CB2 1PZ, United Kingdom

T. J. Lu
Department of Engineering, University of Cambridge, Trumpington Street, Cambridge CB2 1PZ, United Kingdom

Howard P. Hodson
Whittle Laboratory, University of Cambridge Madingley Road, Cambridge CB3 OD, UK


This paper presents a general numerical method to quantify the effect of thermal dispersion on the heat transporting capability of a periodic porous medium subjected to forced convection. With a regular geometrical representation for the porous medium and upon introducing a temperature pulse into the steady-state laminar fluid flow, the microscopic flow and temperature fields are obtained using the one-energy-equation model. These are subsequently used to evaluate the effective thermal conductivity of the porous medium.
This approach is first verified with a model of parallel-plate array for which an analytical solution exists. The local thermal equilibrium assumption is discussed and the augment mechanisms of effective thermal conductivity are investigated. Numerical simulations on laminar flow through a matrix of regularly arranged square rods are subsequently carried out. Various factors that affect the thermal dispersion in the porous medium are investigated, such as the solid-to-fluid conductivity ratio, porosity and Peclet number.

ICHMT Digital Library

Bow shocks on a jet-like solid body shape. Thermal Sciences 2004, 2004. Pulsed, supersonic fuel jets - their characteristics and potential for improved diesel engine injection. PULSED, SUPERSONIC FUEL JETS - THEIR CHARACTERISTICS AND POTENTIAL FOR IMPROVED DIESEL ENGINE INJECTION
View of engine compartment components (left). Plots of temperature distributions in centreplane, forward of engine (right). CHT-04 - Advances in Computational Heat Transfer III, 2004. Devel... DEVELOPMENT AND CURRENT STATUS OF INDUSTRIAL THERMOFLUIDS CFD ANALYSIS
Pratt & Whitney's F-135 Joint Strike Fighter Engine under test in Florida is a 3600F class jet engine. TURBINE-09, 2009. Turbine airfoil leading edge stagnation aerodynamics and heat transfe... TURBINE AIRFOIL LEADING EDGE STAGNATION AERODYNAMICS AND HEAT TRANSFER - A REVIEW
Refractive index reconstructed field. (a) Second iteration. (b) Fourth iteration. Radiative Transfer - VI, 2010. Theoretical development for refractive index reconstruction from a radiative ... THEORETICAL DEVELOPMENT FOR REFRACTIVE INDEX RECONSTRUCTION FROM A RADIATIVE TRANSFER EQUATION-BASED ALGORITHM
Two inclusion test, four collimated sources. Radiative Transfer - VI, 2010. New developments in frequency domain optical tomography. Part II. Application with a L-BFGS associated to an inexa... NEW DEVELOPMENTS IN FREQUENCY DOMAIN OPTICAL TOMOGRAPHY. PART II. APPLICATION WITH A L-BFGS ASSOCIATED TO AN INEXACT LINE SEARCH