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Research Papers: Porous Media

Transient Methods of Thermal Properties Measurement on Fibrous Materials

[+] Author and Article Information
Zuo Lei, Sukang Zhu

Institute of Physics of Fibrous Soft Matters, Donghua University, Shanghai 200051, China

Ning Pan

Institute of Physics of Fibrous Soft Matters, Donghua University, Shanghai 200051, China; Department of Biological and Agricultural Engineering, University of California, Davis, CA 95616

J. Heat Transfer 132(3), 032601 (Dec 23, 2009) (7 pages) doi:10.1115/1.4000049 History: Received February 13, 2009; Revised July 28, 2009; Published December 23, 2009; Online December 23, 2009

Fibrous material is a complex porous medium and steady test methods are the main test approaches we currently depend on to study the heat transfer properties. The application of unsteady test methods on fibrous material is still not mature. In this paper, some systematic studies are taken to investigate this problem. By analyzing the main factors impacting the test results, it is found that the local heat convection potentially excited by imposing test temperature can be avoided by limiting the internal temperature gradient and the so-called dual-phase lagging effects are negligible so that the feasibility of the unsteady test method is verified via both theoretical analysis and experimental data.

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Figures

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Figure 1

Measuring principle of stepwise transient method

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Figure 2

The schematic diagram of test apparatus

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Figure 3

The actual sample in the experiment

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Figure 4

The impact of material thermophysical properties on Δfm

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Figure 5

The influence of t on |Δf|

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Figure 6

The influence of q on |Δf|

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Figure 7

The testing results for nonwoven fabric under different heat source power

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Figure 8

The test result of fiber materials (the range is +/− standard deviation of the test result)

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