钙质砂热传导性能试验

基于热针法测得了不同条件下南海钙质砂的热传导性能,探讨了含水率、干密度、温度、颗粒粒径等因素对钙质砂热导率的影响。研究结果表明：钙质砂热导率随含水率、干密度的增大而增大,且含水率越大,干密度对热导率的影响越明显;相对于随干密度的变化,钙质砂热导率随含水率的变化尤为显著;钙质砂热导率随温度升高而增大,但是热导率在不同温度下随含水率的增长趋势不同;颗粒粒径对钙质砂热导率的影响甚微;在钙质砂中掺入一定量石英砂有助于改善其导热性能。

Experimental study on thermal conductivity of calcareous sand

The thermal conductivity of calcareous sand in the South China Sea is measured under different conditions by the thermal probe method, and the effects of water content, dry density, temperature, particle size and other factors on the thermal conductivity of calcareous sand are discussed. The results show that the thermal conductivity of calcareous sand increases with the increase of the water content and dry density, and the higher the water content, the more significant the influences of dry density on thermal conductivity. The thermal conductivity of calcareous sand increases with the increase of the temperature, but the thermal conductivity of calcareous sand varies with the increasing trend of water content at different temperatures. The particle size has little effect on the thermal conductivity of calcareous sand. Adding a certain amount of quartz sand into the calcareous sand helps to improve its thermal conductivity.