Numerical Simulation of Heat Transfer of Porous Rock Layers in Cold Sandy Regions DOI Creative Commons
Kaichi Qiu, Yong Huang, Fenglei Han

и другие.

Atmosphere, Год журнала: 2023, Номер 14(12), С. 1812 - 1812

Опубликована: Дек. 11, 2023

The heat transfer characteristics of porous rock layers (PRLs) have significant seasonal differences. This feature has been used to protect the permafrost subgrade under highways and railways from degeneration. However, in cold sandy environments, transformation law PRLs on account climate warming aeolian sand filling needs be solved. work developed a coupled model for soil–PRL system aimed at analyzing convective process mechanism closed PRL. Furthermore, impact cooling performance PRL different mean annual air temperatures (MAATs) −3.5, −4.5, −5.5 °C was quantified. numerical results indicated that natural convection occurred only winter, effective height layer decreased with sand-filling thickness. As thickness increased, critical temperature difference occurrence accompanied by decreases Rayleigh number, duration, intensity convection. When exceeded 80 cm, would not occur Under scenario 0.052 °C·a−1, could offset adverse raise table first 20 years. Moreover, can more regions colder MAATs. For zones, sand-control measures should taken maintain long-term study is great significance guiding embankment design road maintenance along Qinghai–Tibetan Railway.

Язык: Английский

Numerical Simulation of Heat Transfer of Porous Rock Layers in Cold Sandy Regions DOI Creative Commons
Kaichi Qiu, Yong Huang, Fenglei Han

и другие.

Atmosphere, Год журнала: 2023, Номер 14(12), С. 1812 - 1812

Опубликована: Дек. 11, 2023

The heat transfer characteristics of porous rock layers (PRLs) have significant seasonal differences. This feature has been used to protect the permafrost subgrade under highways and railways from degeneration. However, in cold sandy environments, transformation law PRLs on account climate warming aeolian sand filling needs be solved. work developed a coupled model for soil–PRL system aimed at analyzing convective process mechanism closed PRL. Furthermore, impact cooling performance PRL different mean annual air temperatures (MAATs) −3.5, −4.5, −5.5 °C was quantified. numerical results indicated that natural convection occurred only winter, effective height layer decreased with sand-filling thickness. As thickness increased, critical temperature difference occurrence accompanied by decreases Rayleigh number, duration, intensity convection. When exceeded 80 cm, would not occur Under scenario 0.052 °C·a−1, could offset adverse raise table first 20 years. Moreover, can more regions colder MAATs. For zones, sand-control measures should taken maintain long-term study is great significance guiding embankment design road maintenance along Qinghai–Tibetan Railway.

Язык: Английский

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