Analog experiments on thermal creep gas flow through Martian soil

摘要: Abstract At the low atmospheric pressure on Mars, thermal creep within its soil is unavoidable. Soil a complex mixture of particles and pores it not clear priori how to quantify such subsoil gas flow. A capillary model flow through granular beds was set up recently based laboratory experiments. Here, we extend earlier experiment probe different parameter ranges model. For bed directly traced resulting in regime 2–300 Pa. We specifically analyze dependence species - used He, CO2, N2 air. These data agree well calculations. This latest evidence strongly supports simple but analytical creep. Including CO2 measurements now allows quantitative calculations circulation distribution Martian as network Knudsen pumps.