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Research Papers: Forced Convection

Bifurcated Forced Convective Heat Transfer of Supercritical CO2 Flow in Plane Symmetric Sudden Expansion Duct

[+] Author and Article Information
Bi-Li Deng

Department of Energy and Resources Engineering, College of Engineering, Peking University, Beijing 100871, China

Xin-Rong Zhang

Department of Energy and Resources Engineering, College of Engineering, Peking University, Beijing 100871, China; Department of Mechanical Engineering, Energy Conversion Research Center, Doshisha University, Kyo-Tanabeshi, Kyoto 610-0321, Japan

Hiroshi Yamaguchi

Department of Mechanical Engineering, Energy Conversion Research Center, Doshisha University, Kyo-Tanabeshi, Kyoto 610-0321, Japan

J. Heat Transfer 133(2), 021703 (Nov 03, 2010) (7 pages) doi:10.1115/1.4002440 History: Received March 23, 2010; Revised August 18, 2010; Published November 03, 2010; Online November 03, 2010

This study presents a computational investigation of forced convection of supercritical CO2 flow in plane symmetric sudden expansion duct at an expansion ratio of 2 in flow asymmetric regime. Computations were conducted at various Reynolds numbers in flow asymmetric regime and low wall heat fluxes below 500W/m2 to examine the Reynolds number and thermal effects on the flow and heat transfer of the bifurcated flow. General flow features and temperature distributions are presented. The transitional Reynolds numbers above, which a third recirculation region will appear at different wall heat flux are presented, and thus thermal effects on the flow stability are discussed. Reynolds number and thermal effects on distributions of wall skin friction, pressure coefficient, and Nusselt number are presented and discussed.

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Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 1

Variations of thermophysical properties (TP) with temperature at 9 Mpa, density ρ×10−2(kg/m3), specific heat Cp×10−3(J/kg K), thermal conductivity k×102(W/m K), and dynamic viscosity μ×105(Pa s)

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Figure 2

Schematic diagram of the computation model

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Figure 3

Streamlines for general flow behaviors at qw=250 W/m2

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Figure 4

Bifurcation diagram

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Figure 5

Reynolds number effect on the variations of friction coefficient at qw=250 W/m2

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Figure 6

Thermal effect on the variations of friction coefficient at Re=280

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Figure 7

Reynolds number effect on contour of pressure coefficient qw=250 W/m2

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Figure 8

Thermal effect on contour of pressure coefficient Re=280

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Figure 9

Variations of wall temperature qw=250 W/m2

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Figure 10

Contours of dimensionless temperature qw=250 W/m2

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Figure 11

Reynolds number effect on the variations of Nusselt number qw=250 W/m2

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Figure 12

Thermal effect on the variations of Nusselt number Re=280

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