Summary
Two main mechanisms, nucleate boiling and convective boiling, are widely accepted for in-tube flow boiling. Since the active nuclei on the heated wall are dominant for nucleate boiling and flow pattern governs the convective boiling, the heat transfer coefficient is strongly influenced by the wall heat flux, mass flux and vapour quality, respectively. In practical industrial applications, for example, the evaporators in refrigeration, forced convective evaporation is the dominant process and high heat transfer efficiency can be obtained under smaller temperature difference between wall and liquid. Therefore, it is of importance to develop a correlation of convective boiling heat transfer with a good accuracy. In this paper, a new kind of micro-finned helically coiled tube was developed and the flow boiling heat transfer characteristics were experimentally studied with R-134a. Based on the analysis of the mechanisms of flow boiling, heat transfer correlations of the specific micro-finned helically coiled tubes are obtained. [Reprinted with permission from Elsevier. Copyright, 2006].
Details
- Original title: A heat transfer correlation of flow boiling in micro-finned helically coiled tube.
- Record ID : 2007-0117
- Languages: English
- Source: International Journal of Heat and Mass Transfer - vol. 49 - n. 17-18
- Publication date: 2006/08
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Indexing
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Themes:
HFCs;
Heat transfer;
Mass transfer - Keywords: R134a; Correlation; Microfin tube; Helical tube; Heat transfer; Expérimentation; Heat exchanger; Boiling
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Boiling heat transfer of R-134a in helical pipes.
- Author(s) : HAN J., LI S., PAN J. H.
- Date : 2007/08/21
- Languages : English
- Source: ICR 2007. Refrigeration Creates the Future. Proceedings of the 22nd IIR International Congress of Refrigeration.
- Formats : PDF
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Experimental investigation on flow boiling heat...
- Author(s) : SHAO L., HAN J., CHEN C., et al.
- Date : 2009/12
- Languages : Chinese
- Source: Journal of Refrigeration - vol. 30 - n. 6
- Formats : PDF
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Flow boiling of refrigerant R-134a inside a mic...
- Author(s) : CAVALLINI A., DEL COL D., PADOVAN A., et al.
- Date : 2007/08/21
- Languages : English
- Source: ICR 2007. Refrigeration Creates the Future. Proceedings of the 22nd IIR International Congress of Refrigeration.
- Formats : PDF
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Experimental study on condensation of pure refr...
- Author(s) : YONEMOTO R., KOYAMA S.
- Date : 2007
- Languages : Japanese
- Source: Transactions of the Japan Society of Refrigerating and Air Conditioning Engineers - vol. 24 - n. 2
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Experimental study on critical heat flux charac...
- Author(s) : CHEN C. N., HAN J. T., JEN T. C., et al.
- Date : 2011/02
- Languages : English
- Source: International Journal of thermal Sciences - vol. 50 - n. 2
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