scholarly journals Effect of axial conduction and viscous dissipation on heat transfer for laminar flow through a circular pipe

2016 ◽  
Vol 8 ◽  
pp. 61-65 ◽  
Author(s):  
Mohan Jagadeesh Kumar Mandapati
Keyword(s):  
Heat Transfer ◽  
Laminar Flow ◽  
Viscous Dissipation ◽  
Circular Pipe ◽  
Axial Conduction ◽  
Flow Through

Numerical Analysis of Convective Heat Transfer of Nanofluids for Laminar Flow in a Circular Tube

2012 ◽  
Author(s):  
Oguz Kirez ◽  
Almila Yazicioglu ◽  
Sadik Kakac
Keyword(s):  
Heat Transfer ◽  
Numerical Analysis ◽  
Laminar Flow ◽  
Boundary Conditions ◽  
Heat Transfer Enhancement ◽  
Viscous Dissipation ◽  
Particle Diameter ◽  
Transfer Enhancement ◽  
Circular Duct ◽  
Axial Conduction

In this study, a numerical analysis of heat transfer enhancement of Alumina/water nanofluid in a steady-state, single-phase, laminar flow in a circular duct is presented for the case of constant wall heat flux and constant wall temperature boundary conditions. The analysis is performed with a newly suggested model (Corcione) for effective thermal conductivity and viscosity, which show the effects of temperature and nanoparticle diameter. The results for Nusselt number and heat transfer enhancement are presented in graphical and tabular forms, for a given Peclet number, nanoparticle volumetric fraction, and particle diameter in the thermal entrance region. The results are compared with the experimental results available in the literature under the same conditions and a good agreement is found. The two boundary conditions are compared and slightly differing results are discussed. Finally, the effect of the axial conduction and viscous dissipation are investigated. The axial conduction effect is found to be negligible for practical cases while the viscous dissipation effect is found to be significantly important depending on the boundary conditions and the pipe diameter.

A Method to Solve Conjugate Heat Transfer Problems: The Case of Fully Developed Laminar Flow in a Pipe

1985 ◽  
Vol 107 (1) ◽  
pp. 77-83 ◽  
Author(s):  
G. S. Barozzi ◽  
G. Pagliarini
Keyword(s):  
Heat Transfer ◽  
Laminar Flow ◽  
Conjugate Heat Transfer ◽  
General Procedure ◽  
Superposition Principle ◽  
Relative Importance ◽  
Axial Conduction ◽  
Flow Through ◽  
Transfer Problems ◽  
Fluid Conductivity

A simple, fast, and rather general procedure combining the superposition principle with a finite element method is proposed to deal with conjugate heat transfer problems. The method is employed to consider the wall conduction effect on heat transfer to fully developed laminar flow through a pipe whose exterior boundary is uniformly heated along a finite length. Results are given for two values of each of the four parameters determining the relative importance of axial conduction: the Peclet number of the fluid, the wall to fluid conductivity ratio, and the dimensionless thickness and length of the heated section of the pipe.

Hot-Wire Measurements of Turbulence Correlations in a Triangular Duct

1962 ◽  
Vol 29 (4) ◽  
pp. 609-614 ◽  
Author(s):  
C. J. Cremers ◽  
E. R. G. Eckert
Keyword(s):  
Heat Transfer ◽  
Laminar Flow ◽  
Cross Section ◽  
Circular Tube ◽  
Turbulent Transport ◽  
Circular Cross Section ◽  
Hot Wire ◽  
Round Tube ◽  
Flow Through ◽  
Hot Wires

Previous studies by flow visualization have indicated that the flow through a duct of triangular cross section is in its characteristics quite different from flow through a duct with circular cross section. They revealed among others that purely laminar flow exists in the corners of the duct even though the bulk of the fluid moves in turbulent motion. Heat-transfer measurements in such a duct appear to indicate that the turbulent transport in the direction of the height of the duct is considerably smaller than expected from circular tube measurements. The present paper reports the measurements of turbulent correlations for turbulent flow through such a duct. These measurements have been made with hot wires of very small dimensions. They again reveal the existence of a laminar corner region. In the bulk of the fluid, the differences of the correlations to those in a round tube turned out to be smaller than originally suspected.

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