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Technical Brief

Numerical Investigation of Heat Transfer Enhancement Inside the Pipes Filled With Radial Pore-Size Gradient Porous Materials

[+] Author and Article Information
Peiyong Ma, Xianjun Xing

School of Mechanical Engineering,
Hefei University of Technology,
Hefei 230009, Anhui, China;
Institute of Advanced Energy Technology & Equipment,
Hefei University of Technology,
Hefei 230009, Anhui, China

Baogang Wang

School of Automotive and Transportation Engineering,
Hefei University of Technology,
Hefei 230009, Anhui, China

Shuilin Chen

School of Mechanical Engineering,
Hefei University of Technology,
Hefei 230009, Anhui, China

Xianwen Zhang

Institute of Advanced Energy Technology & Equipment,
Hefei University of Technology,
Hefei 230009, Anhui, China;
School of Automotive and Transportation Engineering,
Hefei University of Technology,
Hefei 230009, Anhui, China

Changfa Tao

School of Automotive and Transportation Engineering,
Hefei University of Technology,
Hefei 230009, Anhui, China
e-mail: chftao84@hfut.edu.cn

1Corresponding author.

2Present address: School of Mechanical Engineering, Hefei University of Technology, No. 193, Tunxi Road, Anhui 230009, Hefei, China.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS. Manuscript received June 21, 2017; final manuscript received April 23, 2018; published online June 14, 2018. Assoc. Editor: Sandra Boetcher.

J. Thermal Sci. Eng. Appl 10(5), 054502 (Jun 14, 2018) (5 pages) Paper No: TSEA-17-1214; doi: 10.1115/1.4040276 History: Received June 21, 2017; Revised April 23, 2018

The gradient porous materials (GPMs)-filled pipe structure has been proved to be effective in improving the heat transfer ability and reducing pressure drop of fluid. A GPMs-filled pipe structure in which radial pore-size gradient increased nonlinearly has been proposed. The field synergy theory and tradeoff analysis on the efficiency of integrated heat transfer has been accomplished based on performance evaluation criteria (PEC). It was found that the ability of heat transfer was enhanced considerably, based on the pipe structure, in which the pore-size of porous materials increased as a parabolic opening up. The flow resistance was the lowest and the integrated heat transfer performance was the highest when radial pore-size gradient increasing as a parabolic opening down.

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Figures

Grahic Jump Location
Fig. 1

Model descriptions: (a) the diagrammatic of physical model and (b) the distribution of different pore-size gradient by R-direction

Grahic Jump Location
Fig. 2

Computational fluid dynamics model check: (a) the grid independence check of CFD model and (b) the validation check of CFD model

Grahic Jump Location
Fig. 3

Velocity description: (a) velocity contours with uin = 0.05 m/s and ε = 0.98 and (b) fully developed velocity profiles along the R direction

Grahic Jump Location
Fig. 4

Comparison of parameters in different configurations: (a) average Nusselt number variation with different Reynolds number; (b) friction factor variation with different Reynolds number; (c) PEC values versus the Reynolds number; and (d) field synergy angle distribution inside the fluid fully developed pipe structures with uin = 0.1 m/s

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