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Experiment Study on Water, Vapor, and Heat Transport in the Unsaturated Sandbox

Author: YangZhenLei
Tutor: WanLi
School: Chinese Geology University (Beijing)
Course: Groundwater Science and Engineering
Keywords: Vapor heat transfer Vapor diffusion Water vapor convection Water vapor diffusion Temperature effect
CLC: S152.7
Type: Master's thesis
Year: 2010
Downloads: 54
Quote: 1
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Abstract


Unsaturated soil water vapor heat transfer in the in-depth attention by hydrology and soil physics and other disciplines , the exchange process for the identification of water and energy between the surface and atmosphere of the arid and semi-arid regions in this study is very important . Soil water and heat transport equations are coupled to each other mainly water vapor migration Therefore , this study focused on centralized of soil vapor migration mechanism . Diffusive transport mechanism for water vapor , the domestic and foreign scholars have done a lot of research , and the relatively few studies of the moisture convection and vapor dispersion mechanism . On the basis of soil physical parameters of the test as well as the temperature of the water content observation instrument EasyAG50 effect correction test taken from the fine sand of the Badain Jaran Desert sand box test under three different conditions , according to the preliminary results discussed vapor flow mechanism of the impact of changes in soil moisture characteristics . Through sealed temperature testing , draw the liquid water transport in soil moisture can be ignored when using air-dry desert fine sand sand box water vapor heat transfer test . Derived soil moisture change in violent variable temperature conditions by sealing the variable temperature test , mainly caused by the temperature effect of the instrument itself , the vapor diffusion not play a major role at this stage ; vapor diffusion on when the soil temperature is gradually stabilizing , the changing role of soil moisture and temperature effects only quite , even more than the temperature effect . Ventilation variable temperature test , drawn in the air the actual average flow rate of 0.011cm / s , the contribution rate of water vapor of convection and instrument temperature effect on soil moisture changes were 191.2% and 28.6% , respectively , and water vapor diffusion and vapor diffusion on soil moisture change in the contribution rate of -25.5 % and -94.1 % , respectively . At this point , the water vapor convection is the most important influencing factors for soil moisture change , and not usually think of water vapor diffusion .

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CLC: > Agricultural Sciences > Agriculture as the foundation of science > Soil > Soil physics > Soil moisture
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