Experimental Investigation of Single-Phase Heat Transfer in Horizontal Mini-Tubes with Different Bending Inlets

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	Experimental Investigation of Single-Phase Heat Transfer in Horizontal Mini-Tubes with Different Bending Inlets
	Tam, H. K.; Tam, L. M.; Ghajar, A. J.; Wang, Q. ; Chen, X. W. ; Lei, W. C.
	2019-08-01
Source Publication	Proceeding of 5th International Workshop on Heat/Mass Transfer Advances for Energy Conservation and Pollution Control
Publication Place	Novosibirsk
Publisher	Kutateladze Institute of Thermophysics SB RAS
Abstract	An experimental setup was constructed for this study to measure the heat transfer of the horizontal mini-tubes of 0.8 mm and 2 mm inner diameters under the uniform wall heat flux boundary condition. Three inlet configurations, hydrodynamically fully developed length, 90° bend, and 180° bend, were used in this study. The bending inlets were arranged horizontally and vertically. The Reynolds number range for the entire experiment was approximately between 800 and 11,000. From the heat transfer results, for the two tubes with different inner diameters, the heat transfer characteristics from laminar to turbulent region for the straight tube inlet was matched with those of the macro tube. However, the start of transition was inlet dependent and the bending inlet delayed the start of transition when compared with the hydrodynamically fully developed length. From the entrance to the fully developed region, the laminar region entry length was almost at the length-to-inside diameter ratio of 150 and the laminar heat transfer of all the horizontal and the vertical 90° and 180° bends was observed to be higher than that of the hydrodynamically fully developed length prominently in the entrance region.
Keyword	Mini-tubes Bending Inlets
Language	英語English
The Source to Article	PB_Publication
PUB ID	47232
Document Type	Conference paper
Collection	DEPARTMENT OF ELECTROMECHANICAL ENGINEERING
Recommended Citation GB/T 7714	Tam, H. K.,Tam, L. M.,Ghajar, A. J.,et al. Experimental Investigation of Single-Phase Heat Transfer in Horizontal Mini-Tubes with Different Bending Inlets[C], Novosibirsk:Kutateladze Institute of Thermophysics SB RAS, 2019.
APA	Tam, H. K.., Tam, L. M.., Ghajar, A. J.., Wang, Q. ., Chen, X. W. ., & Lei, W. C. (2019). Experimental Investigation of Single-Phase Heat Transfer in Horizontal Mini-Tubes with Different Bending Inlets. Proceeding of 5th International Workshop on Heat/Mass Transfer Advances for Energy Conservation and Pollution Control.

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