Numerical Investigation of the Forced and Mixed Convection Heat Transfer Inside Horizontal Macro-and-Mini Tubes

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	Numerical Investigation of the Forced and Mixed Convection Heat Transfer Inside Horizontal Macro-and-Mini Tubes
	Yang, Y. F.; Tam, H. K. ; Tam, L. M.; Ghajar, A. J.
	2021-08-01
Source Publication	6th International Worshop on Heat-and-Mass Transfer Advances for Energy Conservation and Pollution Control
Abstract	In this study, a numerical model is established to study the forced and mixed convection heat transfer in the laminar region for eight horizontal tubes (1.2 mm to 4 mm) under the uniform wall heat flux boundary condition. The model is first verified with well-established correlations. For each tube diameter, the Reynolds number is set at 1,000 and the uniform wall heat flux boundary condition is set at 10 kW/m2 . In the simulation, the flow field can be observed to confirm the existence of the buoyant flow inside the larger tube diameter. Referring to the top and bottom heat transfer coefficient ratios and the temperature contour plots; the diameter of 2.0 mm is defined as the critical diameter in which heat transfer changes from mixed convection to forced convection at the length-todiameter ratio of 250. Also, a critical natural-to-forced convection ratio (Gr/Recritical) of 0.16 was calculated accordingly. Finally, a new forced and mixed convection heat transfer flow regime map for the mini-tubes is suggested to be developed after the simulation data are compared with the traditional flow map for macro-tubes.
Keyword	Numerical Forced and Mixed Convection Mini Tubes
Language	英語English
The Source to Article	PB_Publication
PUB ID	60601
Document Type	Conference paper
Collection	DEPARTMENT OF ELECTROMECHANICAL ENGINEERING
Recommended Citation GB/T 7714	Yang, Y. F.,Tam, H. K. ,Tam, L. M.,et al. Numerical Investigation of the Forced and Mixed Convection Heat Transfer Inside Horizontal Macro-and-Mini Tubes[C], 2021.
APA	Yang, Y. F.., Tam, H. K. ., Tam, L. M.., & Ghajar, A. J. (2021). Numerical Investigation of the Forced and Mixed Convection Heat Transfer Inside Horizontal Macro-and-Mini Tubes. 6th International Worshop on Heat-and-Mass Transfer Advances for Energy Conservation and Pollution Control.

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