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TECHNICAL PAPERS: Conduction Heat Transfer

Effect of Constant Heat Flux Boundary Condition on Wall Temperature Fluctuations

[+] Author and Article Information
A. Mosyak, E. Pogrebnyak, G. Hetsroni

Department of Mechanical Engineering, Technion-IIT, Haifa, 32000 Israel

J. Heat Transfer 123(2), 213-218 (Sep 29, 2000) (6 pages) doi:10.1115/1.1345886 History: Received January 11, 2000; Revised September 29, 2000
Copyright © 2001 by ASME
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References

Figures

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Test section made of thick copper plate. (H1 thermal wall boundary condition.) [1-liquid crystal sheet, 2-thermocouple, 3-electrical heater, 4-copper plate, 5-insulation, 6-pertinax frame, 7-bottom of flume].
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Loop of rectangular channel [1-tank, 2-pump, 3-control valve, 4-flow meter, 5-straightener, 6-development section, 7-test section, 8-IR camera, 9-outlet section, 10-heat exchanger]
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Test section made of thin stainless steel strip. (H2 thermal wall boundary condition.) [1-top of channel, 2-stainless steel strip, 3-window, 4-bottom of channel, 5-IR camera].
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Wall-shear velocities in channel water flow [•-present study; ○-data of Donohue 10]
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Dependence of dimensionless local heat transfer coefficient on dimensional thermal entry length [•-present study; ○-data by Hartnett 15]
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Behavior of thermal streak spacing in streamwise direction. Thermal entrance region (H1 case).
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Thermal streaks in thermal entrance region. Channel flow (H2 case).
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Thermal streaks in the developed region (H2 case)
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Wall temperature variation in the spanwise direction (H1 case)
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Wall temperature variation in the spanwise direction (H2 case)
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Dependence of wall temperature fluctuation on thermal entrance length (H1 case)
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Dependence of wall temperature fluctuation on thermal entrance length (H2 case)
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Wall temperature fluctuation in developed thermal boundary layer

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