Modelling two‐dimensional heat and moisture transfer in unsaturated soils, including gravity effects

Hywel Rhys Thomas1
1Department of Civil and Structural Engineering, University College, Cardiff, CFI 1 XL, U.K.

Tóm tắt

AbstractA theoretical model is presented to predict simultaneous transient coupled heat and moisture transfer in partly saturated soils. The formulation is in terms of volumetric moisture content, is two dimensional, includes gravitational flow and takes into account latent heat of vaporization effects. The numerical solution of the problem is accomplished by means of a finite element solution algorithm. Predictions from the numerical model are used to investigate the importance of gravitational flow, for the case of a soil stratum subjected to evaporation losses at the surface. The results achieved show good qualitative agreement with expected behaviour.

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Tài liệu tham khảo

1983, The influence of vegetation on the swelling and shrinking of clays, Symposium in Print, Geotechnique, 33, 87

D. E.Jones Jr. andW. G.Holtz ‘Expansive soils‐the hidden disaster’ Civil Engineering 49–51(1973).

10.1029/TR039i005p00909

10.1016/B978-1-4832-0065-1.50010-6

Hartley J. G., 1981, Transient simultaneous heat and mass transfer in moist, unsaturated soils, Trans. American Soc. Mech. Eng., 103, 376

10.1016/0017-9310(81)90053-3

10.1029/TR038i002p00222

C.BonacinaandG.Comini ‘Computer calculation of mass and heat transfer phenomena.’Proc. 3rd Conf. on Drying Budapest 1971 pp.456–465.

R.GauduandG.Bacon ‘Numerical simulation of heat and mass transfer in unsaturated porous media’ Proc. 1st Int. Conf. on Num. Meth. in Thermal Probs Swansea 1979 pp.1122–1130.

R. J.PreeceandR. M.Blowers ‘A numerical method for evaluating coupled heat and moisture diffusion through porous media with varying physical properties’ Proc. 1st Int. Conf. on Num. Meth. In Thermal Probs Swansea 1979. pp.527–538.

10.1016/0017-9310(76)90067-3

10.1080/01495728008961769

10.1002/nme.1620150910

10.1002/nag.1610020103

R. G.Baca I. P.KingandW. R.Norton ‘Finite element models for simultaneous heat and moisture transport in unsaturated soils’ Proc. 2nd Int. Conf. on Finite Elements in Water Resources Imperial College London 1978 pp.19–35.

10.1029/WR015i005p01195

10.1029/WR018i003p00489

10.4141/cjss73-006

Zienkiewicz O. C., 1977, The Finite Element Method

K. H.Sim ‘A finite element analysis of water flow in a partly saturated soil’ M. Sc. Thesis University College Cardiff 1982.

10.1097/00010694-197311000-00002

Carslaw H. S., 1959, Conduction of Heat in Solids