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Experimental study of free convection from vertical tubes with curved extended surfaces
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Publication Year
2024-03-01
Journal
International Communications in Heat and Mass Transfer
Publisher
Elsevier Ltd
Citation
International Communications in Heat and Mass Transfer, Vol.152
Keyword
Curved extended surfacesFree convectionVertically aligned tubes
Mesh Keyword
Ambient airConditionCurved extended surfaceExtended surfacesHeat transfer rateRadial directionTube wall temperatureVertical tubeVertically alignedVertically aligned tube
All Science Classification Codes (ASJC)
Atomic and Molecular Physics, and OpticsChemical Engineering (all)Condensed Matter Physics
Abstract
Herein, the free convection from vertically aligned tubes with curved extended surfaces is experimentally investigated. Heat transfer rates from tubes with curved extended surfaces to the ambient air are quantified under various conditions, including under varying tube wall temperatures, numbers of extended surfaces, and heights of extended surfaces in the radial direction. A correlation for calculating the Nusselt number is suggested, drawing upon the experimental findings. The difference between the experimental outcomes and the estimates generated by this correlation falls within a 10% margin. Using the correlation, a contour diagram is generated to show the thermal resistances across different numbers and thicknesses of extended surfaces. Finally, the thermal resistance of tubes featuring curved extended surfaces is evaluated against tubes with conventional straight extended surfaces. It is found that the tube with curved extended surfaces has a thermal resistance that is 20% less than that with straight extended surfaces.
ISSN
0735-1933
Language
eng
URI
https://aurora.ajou.ac.kr/handle/2018.oak/33910
https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85182883264&origin=inward
DOI
https://doi.org/2-s2.0-85182883264
Journal URL
https://www.sciencedirect.com/science/journal/07351933
Type
Article
Funding
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government(MSIT) (No. 2020R1F1A1070142 ).
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Kim, Dong-Kwon Image
Kim, Dong-Kwon김동권
Department of Mechanical Engineering
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