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Correlations and shape optimization in a channel with aligned dimples and protrusions

Title
Correlations and shape optimization in a channel with aligned dimples and protrusions
Author
이관수
Keywords
Dimple; Protrusion; Correlation; Optimization; JF factor; Micro-genetic algorithm
Issue Date
2013-05
Publisher
Elsevier Science LTD
Citation
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER,vol64,p444-451
Abstract
In this study, the friction factor and Nusselt number in a plate heat exchanger with dimples and protrusions were investigated according to geometric and operating conditions. The numerical results of a steady-state laminar model for the laminar region and a steady-state SST (shear stress transport) k-omega turbulence model for the turbulent region were in good agreement with an unsteady analysis. For efficient analysis, a correlation for the critical Reynolds number was derived as a function of the geometric parameters. Based on these results, Nusselt number and friction factor correlations applicable to various geometric parameters and operating conditions (500 <= Re-H <= 15,000) were obtained. Multi-objective optimization was carried out, where the objective function was a function of the normalized Nusselt number and normalized friction factor. To investigate the variation of the optimal points according to weighting factors, a Pareto front was generated using a micro-genetic algorithm. When JF factor was used as a single-objective function, the performance of the optimal point was enhanced by 28% compared with that of the reference model. The optimal point was independent of the Reynolds number. (C) 2013 Elsevier Ltd. All rights reserved.
URI
https://www.sciencedirect.com/science/article/pii/S0017931013003694?via%3Dihubhttp://hdl.handle.net/20.500.11754/44765
ISSN
0017-9310
DOI
10.1016/j.ijheatmasstransfer.2013.04.055
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > MECHANICAL ENGINEERING(기계공학부) > Articles
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