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논문 상세정보

종이내 수분확산(제2보)-종이의 공극구조에 의한 수분확산 이론

Molecular Diffusion of Water in Paper(II)-Water-diffusion theory on pore structure of paper-

Abstract

The objective of this study was to investigate the relationship between water vapor diffusion properties and the pore structure of paper. Gas-phase molecular diffusivity of water vapor through pores was determined based on the kinetic theory of gas. A mathematical model was derived to characterize the dimensional changes of the pore caused by the fiber-swelling mechanism. A modified-Fickean diffusion model was designed to simulate the water-vapor diffusion phenomena in porous paper web. Structural characterisocs of paper pores including the tortuosity and the shape factor was studied on a theoretical basis of Knudsen flow diffusion. Results are summarized as follows: 1. The theoretical water vapor diffusivity in gas-phase was 0.092$cm^2$ /min, 2. Porosity was inversely proportional to the degree of wet-swelling of paper, 3. Solid-phase water-diffusivity of fiber was 1.2 $ \times 10^{-5}cm^2/min$, 4. Modified diffusion model was fairly consistent to the experimental data (from part I), and 5. The Fickean pore tortuosity, ranging from 1,000 to 2,500, was in inverse proportion to the porosity of paper, and the Knudsen shape factor and length-angle factor for micro-pores in paper were 0.5~3.5 and about 340, respectively.

저자의 다른 논문

참고문헌 (11)

  1. Reid R.C.;Sherwood, T.K. , The Properties of Gases and Liquids / v.,pp.274-275, 1958
  2. Welty, J. R.;Wicks, C. E.;Wilson, R. E. , Fundamentals of momentum, Heat, and Mass Transfer (3rd Ed.) / v.,pp.471-488, 1984
  3. Molecular Diffusion of Water in Paper(Ⅰ): Steady-state diffusion experiment for the evaluation of water vapor-proof properties of paper , Yoon, S-H.;Jeon, Y.;Ow, S-K.;Seo, Y-B. , J. of Korea Tappi / v.30,pp.53-64, 1998
  4. Kaviany, M. , Principles of Heat Transfer in Porous Media / v.,pp.22-32, 1991
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  7. Siau, J.F. , Flow in Wood / v.,pp.3-6, 1971
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  11. Chapman, S.;Cowling, T. G. , Mathematical Theory of Non-uniform Gases / v.,pp.10-14, 1959

이 논문을 인용한 문헌 (1)

  1. 2002. "Molecular Diffusion of Water in Paper (IV) - Mathematical model and fiber-phase moisture diffusivities for unsteady-state moisture diffusion through paper substrates -" 펄프 종이기술 = Journal of Korea Technical Association of the Pulp and Paper Industry, 34(3): 17~24 

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