The Numerical Prediction of Turbulent Flow and Heat Transfer in The Entrance Region of a Parallel Plate Duct

1976 ◽  
Vol 98 (4) ◽  
pp. 594-600 ◽  
Author(s):  
A. F. Emery ◽  
F. B. Gessner
Keyword(s):  
Heat Transfer ◽  
Turbulent Flow ◽  
Flow Behavior ◽  
Three Dimensional ◽  
Axial Flow ◽  
Entrance Region ◽  
Parallel Plates ◽  
Fully Developed Flow ◽  
Flow And Heat Transfer ◽  
Corner Flows

Velocity and temperature profiles were computed for turbulent flow, both in the entrance region and the fully developed state, in a duct with heated parallel plates. By starting the calculations at the duct inlet and using a finite difference technique and a three-dimensional mixing length originally defined for corner flows, it was possible to predict axial flow behavior and the nonasymptotic approach to fully developed flow with and without associated heat transfer.

Numerical Simulation of Three Dimensional Turbulent Flow and Heat Transfer Within a Multi-Ribbed Cylindrical Duct

1991 ◽  
Author(s):  
C. Taylor ◽  
J. Y. Xia ◽  
J. O. Medwell ◽  
W. D. Morris
Keyword(s):  
Heat Transfer ◽  
Turbulent Flow ◽  
Fluid Model ◽  
Three Dimensional ◽  
Local Variation ◽  
Element Model ◽  
Enhancement Of Heat Transfer ◽  
Transfer Rates ◽  
Flow And Heat Transfer ◽  
Solid Walls

Turbulent flow and heat transfer within stationary and rotating cylindrical ribbed ducts is simulated using a finite element model. The transfer of heat from the solid walls into the fluid is effected using a coupled solid/fluid model and details of the rapid local variation of local Nusselt, especially adjacent to the ribs, is predicted. The enhancement of heat transfer, when compared with heat transfer within a smooth rotating duct, due to the incorporation of ribs is demonstrated. The numerically determined bulk heat transfer rates are also compared with experimental results.

Turbulent Flow and Heat Transfer in the Entrance Region of a Parallel Wall Passage

1969 ◽  
Vol 184 (1) ◽  
pp. 697-712 ◽  
Author(s):  
J. Byrne ◽  
A. P. Hatton ◽  
P. G. Marriott
Keyword(s):  
Heat Transfer ◽  
Boundary Layer ◽  
Entrance Region ◽  
Fully Developed Flow ◽  
Law Of The Wall ◽  
Flow And Heat Transfer ◽  
Developing Flow ◽  
Boundary Layer Development ◽  
Parallel Wall ◽  
Made In

Measurements of boundary layer development and heat transfer were made in the entrance region of a parallel passage and compared with a computer solution based on the law of the wall. Little difference was found between the heat transfer, both measured and predicted, with a developing flow and that predicted with a fully developed flow. The experiments also show that boundary layer parameters, such as momentum thickness, do not approach their fully developed values asymptotically.

Buoyancy Effect on Developing Turbulent Flow and Heat Transfer in a Helical Pipe With Finite Pitch

2000 ◽  
Author(s):  
B. Zheng ◽  
C. X. Lin ◽  
M. A. Ebadian
Keyword(s):  
Heat Transfer ◽  
Turbulent Flow ◽  
Control Volume ◽  
Three Dimensional ◽  
Boussinesq Approximation ◽  
Buoyancy Effect ◽  
Constant Wall Temperature ◽  
Flow And Heat Transfer ◽  
Helical Pipe ◽  
Volume Method

Abstract Numerical modeling was performed to investigate the buoyancy effect on developing turbulent flow and the heat transfer characteristics of saturated water in a helical pipe with finite pitch. The renormalization group (RNG) κ–ε model was used to account for the turbulent flow and heat transfer in the helical pipe at a constant wall temperature with or without buoyancy force effect. A control volume method with second-order accuracy was used to numerically solve the three-dimensional full elliptic governing equations for this problem. The O-type nonuniform structured grid system was adopted to discretize the computation domain. The Boussinesq approximation was applied to deal with the buoyancy. This study explored the influence of buoyancy on the developing heat transfer along the helical pipe. Based on the results of this research, the velocity, temperature, and Nusselt number are presented graphically and analyzed.

Numerical and Experimental Prediction of Transitional Characteristics of Flow and Heat Transfer in an Array of Heated Blocks

1999 ◽  
Vol 121 (3) ◽  
pp. 202-208 ◽  
Author(s):  
Y. Asako ◽  
Y. Yamaguchi ◽  
M. Faghri
Keyword(s):  
Heat Transfer ◽  
Reynolds Number ◽  
Fluid Flow ◽  
Parallel Plate ◽  
Three Dimensional ◽  
Parallel Plates ◽  
Number Range ◽  
Flow And Heat Transfer ◽  
Numerical Predictions ◽  
Experimental Prediction

Three-dimensional numerical analysis, for transitional characteristics of fluid flow and heat transfer in periodic fully developed region of an array of the heated square blocks deployed along one wall of the parallel plates duct, is carried out by using Lam-Bremhorst low-Reynolds-number two equation turbulence model. Computations were performed for Prandtl number of 0.7, in the Reynolds number range of 200 to 2000 and for two sets of geometric parameters characterizing the array. The predicted transitional Reynolds number is lower than the value for the parallel plate duct and it decreases with increasing the height above the module. Experiments were also performed for pressure drop measurements and for flow visualization and the results were compared with the numerical predictions.

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