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Evaluation of Heat Transfer Shear of Different Mechanisms in Flow Subcooled Nucleate Boiling
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International Journal of Engineering (IJE)
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Volume:  4    Issue:  1
Pages:  1-104
Publication Date:   March 2010
ISSN (Online): 1985-2312
Pages 
37 - 43
Author(s)  
 
Published Date   
31-03-2010 
Publisher 
CSC Journals, Kuala Lumpur, Malaysia
ADDITIONAL INFORMATION
Keywords   Abstract   References   Cited by   Related Articles   Collaborative Colleague
 
KEYWORDS:   Nucleate Boiling, Heat Transfer, Quenching, Turbulence, Bubble 
 
 
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Since the mean characteristic of nucleate boiling is bubble formation and collapse near the heating surface, in this study attempts have been made to investigate heat transfer effects due to the bubbles ebullition and collapse cycle. All possible heat transfer mechanisms are studied qualitatively and quantitatively. For quantitative calculation of the heat transfer portion by each of the introduced mechanisms, a series of bubble parameters was selected from the experimental data provided by the high-speed photography of a heated rod containing nucleate boiling regime on its surface. According to the present results, the portion of the mechanisms such as latent heat transfer, super heated layer mixing and single-phase heat transfer are between 6~15%, 12~17%, and 3~5%, respectively. The results also show that the two mechanisms of the turbulence induced by the bubble formation and collapse and quenching have the main performance in transferring heat from the heating surface to the bulk flow. The shared percentage of these two mechanisms is estimated between 23~58.5% and 20.5~40% respectively. 
 
 
 
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2 Vendervort C., Bergles A. E. and Jensen M. K., "Heat Transfer Mechanisms in Very High Heat Flux Subcooled Boiling", Fundamentals of Subcooled Flow Boiling, 1992, HTD-Vol. 217, pp. 1-9.
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6 Ebrahimi M. Master thesis on Behaviour of Bubble in Nucleate Boiling, Shiraz University, Shiraz, Iran, June 2002.
7 Manon E., Mimouni S. “3D Simulations Of Subcooled Boiling Flows with ASTRID, Comparisons with The DEB Experimental Results”, 2001.
8 Giese T., Laurien E.,"A Three Dimensional Numerical Model for The Analysis of Pipe Flow with Cavitation ”, Institute of Nuclear Technology and Energy Systems (IKE) University of Stuttgart, Pfaffenwaldring 31, D-70550 Stuttgart, Germany.
9 Ronald D. and Meng X.,” Local subcooled flow boiling model development”. Prairie View A&M University, College of Engineering and Architectore Thermal Science Research Center, 1996.
10 Wolvering, Tube Heat Transfer Data Book."Boiling Heat Transfer", P 255-265.
11 Das A.K., Das P.K., Saha P. ,”Heat transfer during pool boiling based on evaporation from micro and macrolayer”, International Journal of Heat and Mass Transfer 49 (2006) 3487–3499.
 
 
 
 
 
 
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Mohammadreza Nematollahi : Colleagues
Mohammad Nazififard : Colleagues  
 
 
 
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