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Heat Transfer in Sandstones at Low Temperature

Journal Article


Abstract


  • This paper addresses experimental and modeling investigations of heat transfer in sandstones subject to low-temperature conditions. At low temperature, pore liquid (e.g., water) would freeze; thus, heat is transferred not only in the form of specific heat but also in the form of latent heat. Moreover, the melting point is not constant; it depends on the pore size. Considering these characteristics, a governing equation of heat transfer with phase transition is established using the equivalent heat-capacity method. To calculate the equivalent heat capacity, the relation between ice content and temperature is assessed by the pore-size distribution curve. Heating tests (from 77 to 293��K) of sandstone samples in three saturation conditions (water-saturated, oil-saturated, and dry) are conducted and simulated using the model established. The results reveal that the temperature sensitivity of the heat capacity of dry sandstone is more pronounced in the low-temperature regime than in the high-temperature regime. The thermal conductivity of dry sandstone increases with temperature in the low-temperature regime. This is different with the case of the high-temperature regime at which the thermal conductivity decreases with temperature. The temperature evolution curve for the water-saturated sample features a plateau regime, that is, the temperature remains quasi-constant with time. The analysis demonstrates that the position and length of this temperature plateau are governed by the pore-size distribution.

Publication Date


  • 2019

Citation


  • Liu, Z., Wang, L., Zhao, B., Leng, J., Zhang, G., & Yang, D. (2019). Heat Transfer in Sandstones at Low Temperature. Rock Mechanics and Rock Engineering, 52(1), 35-45. doi:10.1007/s00603-018-1595-x

Scopus Eid


  • 2-s2.0-85053417899

Start Page


  • 35

End Page


  • 45

Volume


  • 52

Issue


  • 1

Place Of Publication


Abstract


  • This paper addresses experimental and modeling investigations of heat transfer in sandstones subject to low-temperature conditions. At low temperature, pore liquid (e.g., water) would freeze; thus, heat is transferred not only in the form of specific heat but also in the form of latent heat. Moreover, the melting point is not constant; it depends on the pore size. Considering these characteristics, a governing equation of heat transfer with phase transition is established using the equivalent heat-capacity method. To calculate the equivalent heat capacity, the relation between ice content and temperature is assessed by the pore-size distribution curve. Heating tests (from 77 to 293��K) of sandstone samples in three saturation conditions (water-saturated, oil-saturated, and dry) are conducted and simulated using the model established. The results reveal that the temperature sensitivity of the heat capacity of dry sandstone is more pronounced in the low-temperature regime than in the high-temperature regime. The thermal conductivity of dry sandstone increases with temperature in the low-temperature regime. This is different with the case of the high-temperature regime at which the thermal conductivity decreases with temperature. The temperature evolution curve for the water-saturated sample features a plateau regime, that is, the temperature remains quasi-constant with time. The analysis demonstrates that the position and length of this temperature plateau are governed by the pore-size distribution.

Publication Date


  • 2019

Citation


  • Liu, Z., Wang, L., Zhao, B., Leng, J., Zhang, G., & Yang, D. (2019). Heat Transfer in Sandstones at Low Temperature. Rock Mechanics and Rock Engineering, 52(1), 35-45. doi:10.1007/s00603-018-1595-x

Scopus Eid


  • 2-s2.0-85053417899

Start Page


  • 35

End Page


  • 45

Volume


  • 52

Issue


  • 1

Place Of Publication