Research Papers

Effective Thermal Conductivity of Stainless Steel Fiber Sintered Felt With Honeycombed Channels

[+] Author and Article Information
Zhenping Wan, Shuiping Zou

School of Mechanical and
Automotive Engineering,
South China University of Technology,
Guangzhou 510640, China

Xiaowu Wang

Department of Physics, School of Science,
South China University of Technology,
Guangzhou 510640, China
e-mail: jouney5@163.com

Jun Deng

School of Mechanical and Automotive
South China University of Technology,
Guangzhou 510640, China

1Correspongding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS. Manuscript received April 18, 2018; final manuscript received September 10, 2018; published online October 26, 2018. Assoc. Editor: Steve Q. Cai.

J. Thermal Sci. Eng. Appl 11(2), 021002 (Oct 26, 2018) (9 pages) Paper No: TSEA-18-1196; doi: 10.1115/1.4041491 History: Received April 18, 2018; Revised September 10, 2018

A novel stainless steel fiber sintered felt (SSFSF) with honeycombed channels (SSFSFHC) is a promising support for catalytic combustion of the volatile organic compounds (VOCs). The SSFSFHC consists of stainless steel fiber, three-dimensionally reticulated porous structures, and interconnected honeycombed channels. The equivalent thermal conductivity (ETC) of the SSFSFHC is tested. It is found that the ETC of the SSFSFHC increases with the hot side temperature increasing but decreases with the porosity increasing and channel occupied area ratio increasing. The ETC of the SSFSFHC changes little with channel diameter increasing. The heat transfer model of the SSFSFHC is considered as parallel/series combinations of relevant thermal resistances. In order to estimate the ETC of the SSFSFHC, the correlation of the ETC of the SSFSF is derived. The expressions of the axial temperature under different porosities are deduced when eliminating the radial heat transfer between the channel section and the SSFSF section. The relationships of the transferred heats and the corresponding resistances along the radial direction are obtained by assuming that the radial heat transfer can be simplified as a serial of heat resistances located between the channels and the SSFSF.

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Fig. 1

The manufacturing process of SSFSFHC sample: (a) cutting, (b) clipping, (c) filling, (d) pressing and preforming, (e) sintering, and (f) final sample

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Fig. 2

Test rig for measuring effective thermal conductivity of samples

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Fig. 3

The ETCs of the SSFSFHCs with different structure parameters under different hot side temperature: (a) influence of porosity on ETC of SSFSFHC with d = 2.5 mm and α = 3%; (b) influence of channel occupied area ratio on ETC of SSFSFHC with ε = 85% and d = 2.5 mm; (c) influence of channel diameter on ETC of SSFSFHC with ε = 85% and α = 3%

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Fig. 4

Scanning electron microscope image of a SSFSFHC: (a) appearance of honeycombed channels, (b) micrograph of a SSFSFHC, (c) inner wall structure of honeycombed channels, and (d) sintering joints between two fibers

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Fig. 5

Equivalent circuit in parallel resistance

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Fig. 6

Configuration of parallel-series model

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Fig. 7

Fitted and tested ETCs of the SSFSF at different porosities and hot side temperatures

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Fig. 8

The linear regression of the calculated ke-SSFSF

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Fig. 9

Equivalent circuit in series and parallel resistance



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