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多孔介质期刊
影响因子: 1.49 5年影响因子: 1.159 SJR: 0.504 SNIP: 0.671 CiteScore™: 1.58

ISSN 打印: 1091-028X
ISSN 在线: 1934-0508

多孔介质期刊

DOI: 10.1615/JPorMedia.v5.i4.20
12 pages

Estimation of Thermal Moisture Diffusivity from Liquid Redistribution Measurements

S. K. Saiful Islam
Department of Mechanical Engineering, National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260
Nihal E. Wijeysundera
Department of Mechanical Engineering, National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260
S. K. Chou
Department of Mechanical Engineering, National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260
K. Srinivasan
Department of Mechanical Engineering, Indian Institute of Science, Bangalore 560 012, India

ABSTRACT

Experiments are performed to estimate the thermal liquid diffusivity of water in cork. The isothermal liquid diffusivity, the moisture content dependent thermal conductivity and the sorption isotherm are measured in separate experiments. A heat and moisture transfer model is used to interpret the experimental data. The error between the measured and predicted moisture distributions is minimized to obtain the best estimate of the thermal liquid diffusivity.The value obtained is 2.1·10-9 kg/m·s·K. The dominant mode of moisture redistribution is the transfer due to the temperature gradient in the material. The ratio of the effective thermal moisture diffusivity to the thermal vapor diffusivity varies from about 2 to 4. The material property that has the most significant impact on the heat flux is the moisture content-dependent thermal conductivity. The contribution of condensation/evaporation processes associated with vapor diffusion to the effective thermal conductivity is less than 5 percent.


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