NUMERICAL INVESTIGATION OF LAMINAR FORCED CONVECTION OF NANOFLUIDS IN CIRCULAR PIPES UNDER UNIFORM WALL HEAT FLUX AND CONSTANT WALL TEMPRATURE

2008 ◽  
Author(s):  
Mehrdad Raisee ◽  
Mostafa Moghaddami ◽  
Zahra Niroobakhsh
Keyword(s):  
Heat Flux ◽  
Numerical Investigation ◽  
Forced Convection ◽  
Wall Heat Flux ◽  
Circular Pipes ◽  
Uniform Wall ◽  
Laminar Forced Convection ◽  
Uniform Wall Heat Flux

Graetz Problem in Curved Square Channels

1975 ◽  
Vol 97 (2) ◽  
pp. 244-248 ◽  
Author(s):  
K. C. Cheng ◽  
R. C. Lin ◽  
J. W. Ou
Keyword(s):  
Heat Flux ◽  
Nusselt Number ◽  
Transfer Problem ◽  
Correlation Equation ◽  
Wall Heat Flux ◽  
Constant Wall Temperature ◽  
Thermal Boundary Conditions ◽  
Circular Pipes ◽  
Uniform Wall ◽  
Uniform Wall Heat Flux

Thermal entrance region heat transfer problem in curved square channels is solved by a numerical method for the two basic thermal boundary conditions of constant wall temperature and uniform wall heat flux by including the curvature ratio effect in the formulation as an independent parameter. Solutions are obtained for Pr = 0.1, 0.7, 5, 10.05 and 500 and Dean numbers ranging from 0–488. Local Nusselt number results are qualitatively similar to those reported in the literature for the case of curved circular pipes. The numerical results for the asymptotic Nusselt number agree well with the only experimental data available for the case of uniform wall heat flux. A correlation equation for the asymptotic Nusselt number is proposed.

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