THE MECHANISM OF HEAT-TRANSFER ENHANCEMENT FOR MINERAL-OIL IN 2/1 RECTANGULAR DUCTS

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Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/27084

Title:	THE MECHANISM OF HEAT-TRANSFER ENHANCEMENT FOR MINERAL-OIL IN 2/1 RECTANGULAR DUCTS
Authors:	CHOU,FC;TUNG,CW
Contributors:	機械工程學系
Keywords:	VISCOELASTIC FLUIDS;CHANNEL;VISCOSITY
Date:	1995
Issue Date:	2010-06-29 18:07:19 (UTC+8)
Publisher:	中央大學
Abstract:	A numerical study is performed to study the mechanism of heat transfer enhancement for mineral oil in 2:1 rectangular ducts. Three different heating conditions are considered: top wall heated, bottom wall heated, and both top and bottom walls heated. For the three heating conditions, the present numerical results are all in good agreement with the experimental data. For the case of top wall heated, the heat transfer enhancement is caused mainly by the axial velocity distortion due to temperature dependence of viscosity. For the case of bottom wall heated, the axial velocity distortion is the major factor to heat transfer enhancement in the region near the entrance. While near the fully-developed region, the heal transfer enhancement is mainly caused by the buoyancy-induced secondary how. The mechanism of heat transfer enhancement for the case of top and bottom walls heated is more like that for bottom wall heated.
Relation:	INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
Appears in Collections:	[Graduate Institute of Mechanical Engineering] journal & Dissertation

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