关键词:
heat
moisture transfer
soil type
unsaturated soil
摘要:
In order to study the effect of different soil types on heat and moisture transfer,a one-dimension soil column experimental platform is constructed,and 6 kinds of soil samples,such as gravel sand,coarse sand,middle sand,fine sand,silt and clay,are selected to study the rules of heat and moisture transfer. The experimental results show that: under the condition of the initial water content of 5%,the heat source temperature of 30 ℃ and the compaction work of 20J,there are some differences for heat transfer in 6 kinds of soil samples during the heating process;the silty sand,fine sand and clay have the best heat transfer effect,the second is the gravel sand and coarse sand,and the heat transfer effect of the middle sand is the worst;in the heat-affected radius,the conduction of heat in soil and the transfer of water content are mutually driven;the closer the monitoring point to the heat source,the more the temperature gradient becomes the main driving force for the migration of water in soil samples,and the farther away from the heat source,the more the humidity gradient becomes the main driving force of the temperature conduction. The difference of the heat and moisture transfer of soil types and the driving mechanism of heat and moisture transfer in unsaturated soil can provide some reference for solving the problems of heat and moisture transfer in different soils. © 2024 Editorial Office Of Water Saving Irrigation. All rights reserved.