Adaptive neuro-fuzzy modeling of convection heat transfer of turbulent supercritical carbon dioxide flow in a vertical circular tube

2010 ◽  
Vol 37 (10) ◽  
pp. 1546-1550 ◽  
Author(s):  
M. Mehrabi ◽  
S.M. Pesteei
Keyword(s):  
Heat Transfer ◽  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Circular Tube ◽  
Convection Heat Transfer ◽  
Fuzzy Modeling ◽  
Convection Heat ◽  
Neuro Fuzzy ◽  
Supercritical Carbon

Neuro-Fuzzy Modeling of the Free Convection Heat Transfer From a Wavy Surface

2014 ◽  
Vol 36 (9) ◽  
pp. 847-855 ◽  
Author(s):  
Alimohammad Karami ◽  
Tooraj Yousefi ◽  
Iraj Harsini ◽  
Ehsan Maleki ◽  
Sajjad Mahmoudinezhad
Keyword(s):  
Heat Transfer ◽  
Free Convection ◽  
Convection Heat Transfer ◽  
Fuzzy Modeling ◽  
Wavy Surface ◽  
Convection Heat ◽  
Neuro Fuzzy ◽  
Free Convection Heat

Effect of Turbulent Prandtl Number on Convective Heat Transfer to Turbulent Upflow of Supercritical Carbon Dioxide

2009 ◽  
Author(s):  
Majid Bazargan ◽  
Mahdi Mohseni
Keyword(s):  
Heat Transfer ◽  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Prandtl Number ◽  
Convection Heat Transfer ◽  
Turbulent Prandtl Number ◽  
Upward Flow ◽  
Transfer Coefficients ◽  
Heat Transfer Coefficients ◽  
Supercritical Carbon

A two-dimensional model is developed to simultaneously solve the momentum and energy equations and thus predict convection heat transfer to an upward flow of supercritical carbon dioxide in a round tube. The effect of the turbulent Prandtl number, Prt, on heat transfer coefficients has been extensively studied. A number of constant values of Prt, as well as a number of suggested equations accounting for variations of Prt with flow conditions, have been examined. The investigation has been carried out for both regimes of enhanced and deteriorated heat transfer. The results of this study show that the increase of Prt, even in the viscous sublayer, cause the heat transfer coefficients to decrease. The models of Prt leading to best agreement with experiments in either regimes of heat transfer were recognized. From the effect Prt has on heat transfer coefficients, it has been deduced that the buoyancy effects in upward flow of a supercritical fluid causes the Prt to decrease and hence the heat transfer coefficients to increase.

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