Experimental investigation on transient pool boiling heat transfer from rough surface and heat transfer correlations
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Date
2019
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International Information and Engineering Technology Association info@iieta.org
Abstract
This paper presents the study of transient boiling characteristics on rough copper sample with surface roughness value (Ra) ranging from 0.106 ?m to 4.03 ?m. The effect of roughness and time constant of exponential heat supply on transient critical heat flux (CHF), maximum heat transfer coefficient (HTC) and onset of nucleate boiling (ONB) is extensively studied. The mechanism of heat transfer in unidirectional scratches of rough sample is discussed. High speed visualization is carried to observe the stages of boiling and bubble dynamics. The HTC correlation developed in this study predicts the present experimental values of HTC with a mean absolute error (MAE) of 9.62 %. © 2019 International Information and Engineering Technology Association. All rights reserved.
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Keywords
Heat flux, Surface roughness, Visualization, Critical heat flux(CHF), Experimental investigations, Experimental values, Heat transfer correlation, High-speed visualization, Maximum heat transfer, Onset of nucleate boiling, Pool boiling heat transfer, Heat transfer
Citation
International Journal of Heat and Technology, 2019, 37, 2, pp. 545-554