EFFECT OF STAGNANT CONDUCTIVITY ON NON-DARCIAN MIXED CONVECTION IN HORIZONTAL SQUARE PACKED CHANNELS

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Title:	EFFECT OF STAGNANT CONDUCTIVITY ON NON-DARCIAN MIXED CONVECTION IN HORIZONTAL SQUARE PACKED CHANNELS
Authors:	CHOU,FC;CHUNG,PY
Contributors:	機械工程學系
Keywords:	SATURATED POROUS-MEDIA;BOUNDARY-LAYER FLOW;FORCED-CONVECTION;HEAT-TRANSFER;THERMAL-CONDUCTIVITY;IMPERMEABLE SURFACES;SPHERE CHANNELS;FLAT-PLATE;DISPERSION;BEDS
Date:	1995
Issue Date:	2010-06-29 18:06:50 (UTC+8)
Publisher:	中央大學
Abstract:	This paper presents a numerical study of stagnant conductivity effect on the fully developed non-Darcian mixed convection in horizontal packed-sphere channels. The effect of stagnant conductivity is characterized by the conductivity ratio of solid sphere to fluid (k(s)/k(f)). The results show that the buoyancy effect affects significantly the secondary flow structure and heat transfer rate when k(s)/k(f) and Peclet number are all low. But under a fixed Rayleigh number, the effect of buoyancy will be suppressed when the value of k(s)/k(f) or Peclet number increases. The critical Rayleigh number for the onset of buoyancy effect is shown to increase more than 1 order of magnitude when k(s)/k(f) increases from 1.3 to 26.8 or 38.8 at low Peclet number.
Relation:	NUMERICAL HEAT TRANSFER PART A-APPLICATIONS
Appears in Collections:	[Graduate Institute of Mechanical Engineering] journal & Dissertation

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