Optimum shape and dimensions of ducts for convective heat transfer in laminar flow at constant wall temperature

2000 ◽  
Vol 43 (5) ◽  
pp. 767-775 ◽  
Author(s):  
Alper Yilmaz ◽  
Orhan Büyükalaca ◽  
Tuncay Yilmaz
Keyword(s):  
Heat Transfer ◽  
Laminar Flow ◽  
Convective Heat Transfer ◽  
Convective Heat ◽  
Wall Temperature ◽  
Optimum Shape ◽  
Constant Wall Temperature

On the Convective Heat Transfer in a Tube of Elliptic Cross Section Maintained Under Constant Wall Temperature

1986 ◽  
Vol 108 (1) ◽  
pp. 33-39 ◽  
Author(s):  
M. A. Ebadian ◽  
H. C. Topakoglu ◽  
O. A. Arnas
Keyword(s):  
Heat Transfer ◽  
Nusselt Number ◽  
Temperature Distribution ◽  
Convective Heat Transfer ◽  
Cross Section ◽  
Convective Heat ◽  
Wall Temperature ◽  
Elliptic Cross Section ◽  
Constant Wall Temperature ◽  
Elliptic Cross

The convective heat transfer problem along the portion of a tube of elliptic cross section maintained under a constant wall temperature where hydrodynamically and thermally fully developed flow conditions prevail is solved in this paper. The successive approximation method is used for the solution utilizing elliptic coordinates. Analytical expressions for temperature distribution and Nusselt number corresponding to the first cycle of approximation are obtained in terms of the ellipticity of the cross section. In the case of a circular section, the first cycle approximation of the Nusselt number is obtained as 3.7288 compared to the exact value of 3.6568. Representative temperature distribution curves are plotted and compared to those corresponding with constant wall heat flux conditions.

The Research on Exergy Transfer of Forced Convective Heat Transfer Through a Duct With Constant Wall Temperature

2005 ◽  
Author(s):  
Shuang-Ying Wu ◽  
Yan Chen ◽  
You-Rong Li ◽  
Dan-Ling Zeng
Keyword(s):  
Heat Transfer ◽  
Convective Heat Transfer ◽  
Convective Heat ◽  
Wall Temperature ◽  
Constant Wall Temperature ◽  
Cross Sectional ◽  
Forced Convective Heat Transfer ◽  
Fully Developed Turbulent Flow ◽  
Exergy Transfer ◽  
Comparison Of The Results

Based on the first and second thermodynamic laws, a new systematic approach to study in detail the exergy transfer processes of forced convective heat transfer through a duct with constant wall temperature for fully developed turbulent flow is introduced. Some definition formula of the local and mean convective exergy transfer coefficient, convective exergy resistance, exergy flux and exergy-transfer Nusselt number etc have been provided and their new generalized expressions are derived. By reference to smooth duct, the numerical results of exergy transfer are obtained, the effect of Reynolds number and different cross-sectional position in the duct on exergy transfer process is analyzed. In addition, a comparison of the results of exergy transfer with that of energy transfer is also discussed.

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