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RESEARCH PAPERS: Forced Convection

Effects of Wall Rotation on Heat Transfer to Annular Turbulent Flow: Outer Wall Rotating

[+] Author and Article Information
Joon Sang Lee1

Department of Mechanical Engineering, 3024 Black Engr. Building,  Iowa State University, Ames, IA 50011

Xiaofeng Xu2

Department of Mechanical Engineering, 3024 Black Engr. Building,  Iowa State University, Ames, IA 50011

Richard H. Pletcher3

Department of Mechanical Engineering, 3024 Black Engr. Building,  Iowa State University, Ames, IA 50011pletcher@iastate.edu

1

Current address: Mechanical Engineering Department, Wayne State University, 5050 Anthony Wayne Drive, Rm. 2100, Detroit, MI 48202

2

Current address: Department of Mechanical Engineering, The Johns Hopkins University, 223 Latrobe Hall, Baltimore, MD 21218

3

Corresponding author

J. Heat Transfer 127(8), 830-838 (Aug 28, 2004) (9 pages) doi:10.1115/1.1929788 History: Received September 23, 2003; Revised August 28, 2004

Simulations were conducted for air flowing upward in a vertical annular pipe with a rotating outer wall. Simulations concentrated on the occurrence of laminarization and property variations for high heat flux heat transfer. The compressible filtered Navier-Stokes equations were solved using a second-order accurate finite volume method. Low Mach number preconditioning was used to enable the compressible code to work efficiently at low Mach numbers. A dynamic subgrid-scale stress model accounted for the subgrid-scale turbulence. When the outer wall rotated, a significant reduction of turbulent kinetic energy was realized near the rotating wall and the intensity of bursting appeared to decrease. This modification of the turbulent structures was related to the vortical structure changes near the rotating wall. It has been observed that the wall vortices were pushed in the direction of rotation and their intensity increased near the nonrotating wall. The consequent effect was to enhance the turbulent kinetic energy and increase the Nusselt number there.

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Copyright © 2005 by American Society of Mechanical Engineers
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Figures

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Figure 1

Sketch of control volumes

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Figure 2

The configuration for annular pipe flow with outer wall rotation

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Figure 3

Variation of Nusselt number along with correlation data

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Figure 4

Mean streamwise velocity for low heating case

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Figure 5

Turbulent intensities for low heating case in streamwise and radial directions

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Figure 6

Streamwise velocity profiles for cases 4, 5, and 6

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Figure 7

Urms, Vrms, and TKE profiles for cases 4, 5, and 6

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Figure 8

Effect of Re and rotation rate on friction coefficient

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Figure 9

The radial profiles of the second production term (P2) in transport equations for u′v′¯

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Figure 10

Richardson number contour plot for radius ratio=0.3

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Figure 11

Vorticity contour plot for nonrotating and rotating cases at 2000, 6000, and 10,000 physical time steps

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Figure 12

Instantaneous temperature contour plot for nonrotating and rotating cases

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Figure 13

Instantaneous U velocity plot for nonrotating and rotating cases

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