A Study on Nucleate Boiling Heat Transfer Enhancement by Thermal Spray Coating

2006 ◽  
Vol 1 ◽  
pp. 103-109 ◽  
Author(s):  
Hitoshi ASANO ◽  
Kenji AKITA ◽  
Yoko KURODA ◽  
Terushige FUJII
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Enhancement ◽  
Thermal Spray ◽  
Boiling Heat Transfer ◽  
Spray Coating ◽  
Nucleate Boiling ◽  
Thermal Spray Coating ◽  
Transfer Enhancement ◽  
Nucleate Boiling Heat Transfer

scholarly journals Experimental study of nucleate boiling heat transfer enhancement by using surfactant

2011 ◽  
Vol 2 (3-4) ◽  
pp. 195-209 ◽  
Author(s):  
R.I. Elghanam ◽  
M.M.EL. Fawal ◽  
R. Abdel Aziz ◽  
M.H. Skr ◽  
A. Hamza Khalifa
Keyword(s):  
Heat Transfer ◽  
Experimental Study ◽  
Heat Transfer Enhancement ◽  
Boiling Heat Transfer ◽  
Nucleate Boiling ◽  
Transfer Enhancement ◽  
Nucleate Boiling Heat Transfer

Effect of Heat Flux on Pool Boiling Heat Transfer Enhancement (Numerical Investigation Approach)

2020 ◽  
Author(s):  
T. S. Mogaji ◽  
O. A. Sogbesan ◽  
Tien-Chien Jen
Keyword(s):  
Heat Transfer ◽  
Heat Flux ◽  
Heat Transfer Coefficient ◽  
Transfer Coefficient ◽  
Heat Transfer Enhancement ◽  
Numerical Investigation ◽  
Boiling Heat Transfer ◽  
Pool Boiling ◽  
Nucleate Boiling ◽  
Transfer Enhancement

Abstract This study presents numerical investigation results of heat flux effect on pool boiling heat transfer enhancement during nucleate boiling heat transfer of water. The simulation was performed for five different heated surfaces such as: brass, copper, mild steel, stainless steel and aluminum using ANSYS simulation software at 1 atmospheric pressure. The samples were heated in a domain developed for bubble growth during nucleate boiling process under the same operational condition of applied heat flux ranged from 100 to 1000 kW/m2 and their corresponding heat transfer coefficient was obtained numerically. Obtained experimental data of other authors from the open literature result is in close agreement with the simulated data, thus confirming the validity of the CFD simulation method used in this study. It is found that heat transfer coefficient increases with increasing heat flux. The results revealed that in comparison to other materials tested, better heat transfer performance up to 38.5% and 7.11% is observed for aluminum and brass at lower superheated temperature difference conditions of 6.96K and 14.01K respectively. This behavior indicates better bubble development and detachment capability of these heating surface materials and could be used in improving the performance of thermal devices toward producing compact and miniaturized equipment.

Mechanism of Nucleate Boiling Heat Transfer Enhancement From Microporous Surfaces in Saturated FC-72

2002 ◽  
Vol 124 (3) ◽  
pp. 500-506 ◽  
Author(s):  
J. H. Kim ◽  
K. N. Rainey ◽  
S. M. You ◽  
J. Y. Pak
Keyword(s):  
Heat Transfer ◽  
Heat Flux ◽  
Heat Transfer Enhancement ◽  
Latent Heat ◽  
Boiling Heat Transfer ◽  
Nucleate Boiling ◽  
Direct Result ◽  
Vapor Flow ◽  
High Heat Flux ◽  
Transfer Enhancement

The present study is an experimental investigation of the nucleate pool boiling heat transfer enhancement mechanism of microporous surfaces immersed in saturated FC-72. Measurements of bubble size, frequency, and vapor flow rate from a plain and microporous coated 390 μm diameter platinum wire using the consecutive-photo method were taken to determine the effects of the coating on the convective and latent heat transfer mechanisms. Results of the study showed that the microporous coating augments nucleate boiling performance through increased latent heat transfer in the low heat flux region and through increased convection heat transfer in the high heat flux region. The critical heat flux for the microporous coated surface is significantly enhanced over the plain surface due to decreased latent heat transfer (decreased vapor generation rate) and/or increased hydrodynamic stability from increased vapor inertia; both of which are a direct result of increased nucleation site density.

Macro- to Microscale Boiling Heat Transfer From Metal-Graphite Composite Surfaces

2009 ◽  
Vol 131 (9) ◽  
Author(s):  
Wen-Jei Yang ◽  
Nengli Zhang ◽  
Daniel L. Vrable
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Enhancement ◽  
Boiling Heat Transfer ◽  
Thermal Hysteresis ◽  
Bubble Formation ◽  
Nucleate Boiling ◽  
Transfer Enhancement ◽  
Bubble Generation ◽  
Composite Surface ◽  
Graphite Composite

This paper introduces a novel heat transfer enhancement surface, referred to as metal-graphite composite surface. It is comprised of high thermal conductivity graphite microfibers interspersed within a metal matrix (copper or aluminum) to enhance the bubble formation at the nucleation sites, and significantly improve the nucleate boiling heat transfer. Experiments revealed that its boiling heat transfer enhancement is comparable or in some respect even superior to the commercially available boiling heat transfer enhancement surfaces such as porous boiling surface and integral roughness surface. In addition, it does not result in any extra pressure loss and it minimizes surface fouling. Macro- to microscale heat transfer phenomena of the composite surfaces is treated. Discussions include characteristics of the surface, enhancement mechanisms, critical heat flux, boiling thermal hysteresis, bubble generation, growth and departure, and applications in electronic cooling, and under reduced gravity conditions.

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