SENSITIVITY OF A COUPLED HEAT AND MASS TRANSFER MODEL FOR UNSATURATED SOILS

摘要：

A new form of heat and moisture transfer relations in unsaturated porous media are introduced and then a sensitivity analysis of thermal properties is presented.The proposed model is defined with the effects of combined volumetric moisture content changes and temperature gradients.Thus at this formulation, there are introduced some new material parameters for each obtained equation which are related with thermodynamic specifications of soil and the soil-water characteristic curve.Hence, the influences by changing of each material parameter is so important in thermal behavior of wet soils, that in this paper will discussed on three kinds of them separately.The volumetric thermal and isothermal capacity, diffusivity and conductivity coefficients are defined from mass and heat balanced equations, investigated by some thermal graphs.Meanwhile, the suction derivatives which are the main parameters affected on thermal and isothermal coefficients, is obtained by examinating of the retention curve.As a result, it was found that the volumetric water content and specific heat capacity are the main factors could be effective to generating the thermal and isothermal diffiisivities and conductivities in representing of coupled behavior of heat and moisture in unsaturated porous media.This sensitivity studies allows for a more accurate prediction of the soil temperature field and the circulating fluid temperature profile, and also can be helped to determine the accurate perception of the thermal and isothermal material parameters.

关键词： heat and moisture transfer unsaturated soil volumetric moisture content temperature gradient sensitivity analysis

作者: MOHAMMAD HOSSEIN JAHANGIR SEYED AMIRODIN SADRNEJAD

作者单位: Civil Engineering,Khaje Nasirodin Toosi University of Technology,Tehran,Iran Civil Engineering Dep,,Khaje Nasirodin Toosi University of Technology,Tehran,Iran

会议类型: 国际会议

会议名称: 3rd International Conference on Mechanical and Electrical Technology(ICMET2011) (2011第三届机械与电气技术国际会议)

会议地点: 大连

会议语种:英文

页码: 695-703

在线出版日期: 2011-08-26（万方平台首次上网日期，不代表论文的发表时间）