Heat transfer of rectangular narrow channel with two opposite scale-roughened walls

Shyy Woei Chang; Tong Miin Liou; Ming Hsin Lu

doi:10.1016/j.ijheatmasstransfer.2005.04.015

Heat transfer of rectangular narrow channel with two opposite scale-roughened walls

Shyy Woei Chang, Tong Miin Liou, Ming Hsin Lu

Department of Systems and Naval Mechatronic Engineering

Research output: Contribution to journal › Article › peer-review

56 Citations (Scopus)

Abstract

An experimental study of heat transfer and pressure drop in a rectangular channel roughened by scaled surfaces on two opposite walls with flows directed in the forward and downward directions for Reynolds numbers (Re) in the range of 1500 ≤ Re ≤ 15,000 was performed. Nusselt number ratios between the scale-roughened and smooth-walled ducted flows (Nu/Nu_∞) were in the range of 7.4-9.2 and 6.2-7.4 for laminar forward and downward flows respectively. The Nu/Nu_∞ values for turbulent developed flows in the scale-roughened channel with forward and downward flows were about 4.5 and 3 respectively. A comparison of present data with reported results using different types of surface roughness demonstrated the better thermal performances of present scale-roughened channel with forward flow at conditions of Re > 10,000. Experimental correlations of heat transfer and friction coefficient were derived for the present scale-roughened rectangular channel.

Original language	English
Pages (from-to)	3921-3931
Number of pages	11
Journal	International Journal of Heat and Mass Transfer
Volume	48
Issue number	19-20
DOIs	https://doi.org/10.1016/j.ijheatmasstransfer.2005.04.015
Publication status	Published - 2005 Sep 1

All Science Journal Classification (ASJC) codes

Condensed Matter Physics
Mechanical Engineering
Fluid Flow and Transfer Processes

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10.1016/j.ijheatmasstransfer.2005.04.015

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title = "Heat transfer of rectangular narrow channel with two opposite scale-roughened walls",

abstract = "An experimental study of heat transfer and pressure drop in a rectangular channel roughened by scaled surfaces on two opposite walls with flows directed in the forward and downward directions for Reynolds numbers (Re) in the range of 1500 ≤ Re ≤ 15,000 was performed. Nusselt number ratios between the scale-roughened and smooth-walled ducted flows (Nu/Nu∞) were in the range of 7.4-9.2 and 6.2-7.4 for laminar forward and downward flows respectively. The Nu/Nu∞ values for turbulent developed flows in the scale-roughened channel with forward and downward flows were about 4.5 and 3 respectively. A comparison of present data with reported results using different types of surface roughness demonstrated the better thermal performances of present scale-roughened channel with forward flow at conditions of Re > 10,000. Experimental correlations of heat transfer and friction coefficient were derived for the present scale-roughened rectangular channel.",

author = "Chang, {Shyy Woei} and Liou, {Tong Miin} and Lu, {Ming Hsin}",

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T1 - Heat transfer of rectangular narrow channel with two opposite scale-roughened walls

AU - Chang, Shyy Woei

AU - Liou, Tong Miin

AU - Lu, Ming Hsin

PY - 2005/9/1

Y1 - 2005/9/1

N2 - An experimental study of heat transfer and pressure drop in a rectangular channel roughened by scaled surfaces on two opposite walls with flows directed in the forward and downward directions for Reynolds numbers (Re) in the range of 1500 ≤ Re ≤ 15,000 was performed. Nusselt number ratios between the scale-roughened and smooth-walled ducted flows (Nu/Nu∞) were in the range of 7.4-9.2 and 6.2-7.4 for laminar forward and downward flows respectively. The Nu/Nu∞ values for turbulent developed flows in the scale-roughened channel with forward and downward flows were about 4.5 and 3 respectively. A comparison of present data with reported results using different types of surface roughness demonstrated the better thermal performances of present scale-roughened channel with forward flow at conditions of Re > 10,000. Experimental correlations of heat transfer and friction coefficient were derived for the present scale-roughened rectangular channel.

AB - An experimental study of heat transfer and pressure drop in a rectangular channel roughened by scaled surfaces on two opposite walls with flows directed in the forward and downward directions for Reynolds numbers (Re) in the range of 1500 ≤ Re ≤ 15,000 was performed. Nusselt number ratios between the scale-roughened and smooth-walled ducted flows (Nu/Nu∞) were in the range of 7.4-9.2 and 6.2-7.4 for laminar forward and downward flows respectively. The Nu/Nu∞ values for turbulent developed flows in the scale-roughened channel with forward and downward flows were about 4.5 and 3 respectively. A comparison of present data with reported results using different types of surface roughness demonstrated the better thermal performances of present scale-roughened channel with forward flow at conditions of Re > 10,000. Experimental correlations of heat transfer and friction coefficient were derived for the present scale-roughened rectangular channel.

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JO - International Journal of Heat and Mass Transfer

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SN - 0017-9310

IS - 19-20

ER -

Heat transfer of rectangular narrow channel with two opposite scale-roughened walls

Abstract

All Science Journal Classification (ASJC) codes

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