Thermal effect on drainage flow of a viscous gas from a semisealed narrow channel

Huang, Wei; Chen, Kang Ping

doi:10.1103/physrevfluids.4.084202

Cited by 6 publications

(2 citation statements)

References 15 publications

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“…The higher the temperature, the smaller the gas flow rate. It is due to the large gas absolute (dynamic) viscosity for high temperature [42][43][44][45].…”

Section: Calculation Of Gas Permeabilitymentioning

confidence: 99%

“…However, the ability to control temperature is not available in these permeameters. Furthermore, considering that temperature significantly affects gas viscosity [42][43][44][45] and consequently permeability, further investigation into the influence of this variable on low-pressure gas permeability is warranted. Therefore, utilizing the current apparatus to measure gas permeability with low-level gas pressure poses a challenge.…”

Section: Introductionmentioning

confidence: 99%

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A Temperature-Controlled Apparatus for Gas Permeability under Low Gas Pressure

Wu,

Huang,

Liu

et al. 2023

Applied Sciences

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The measurement of soil gas permeability is influenced by the temperature and pressure fluctuation in the low gas pressure region. In order to investigate these influences, a soil temperature-controlled apparatus connected to a low-gas-pressure supply equipment is proposed in this study. The low constant gas pressure is supplied by two Mariotte bottles, by which the airflow rate is measured. Meanwhile, the soil specimen is controlled by a temperature-controlled apparatus. During the test, the negative pore water pressure and volume change of the soil specimen are measured. Through the temperature-controlled apparatus, it is observed that as the temperature increases from 25 °C to 60 °C, there is a corresponding increase in soil sample porosity by 5.4%, while the negative pressure of pore water decreases by 11.1%. This can be attributed to the reduction in the surface tension of contractile skin caused by elevated temperatures. Furthermore, due to variations in gas viscosity with temperature, there was a significant decrease in the gas flow rate by 50.5%. And, the relationship between permeability and volumetric gas content at different temperatures in low-pressure regions well confirms the existing power-law model. In addition, the existence of a temperature-independent critical negative pore water pressure is observed, beyond which the intrinsic permeability remains constant. At 36 kPa of negative pore water pressure, the intrinsic permeability at 60 °C exhibits an 81.8% reduction compared to that at 25 °C. This decline in intrinsic permeability can be attributed to a diminished pore connectivity, resulting from elevated temperatures.

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“…The higher the temperature, the smaller the gas flow rate. It is due to the large gas absolute (dynamic) viscosity for high temperature [42][43][44][45].…”

Section: Calculation Of Gas Permeabilitymentioning

confidence: 99%