Coupled heat and mass transfer in shallow caves: Interactions between turbulent convection, gas radiative transfer and moisture transport

Qaddah, B.; Soucasse, Laurent; Doumenc, F.; Mergui, Sophie; Rivière, Ph.; Soufiani, Anouar

doi:10.1016/j.ijthermalsci.2023.108556

Cited by 3 publications

(2 citation statements)

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“…(2019) and Qaddah et al. (2023) confirmed by numerical simulations the significance of radiative transfer inside weakly ventilated shallow caves, and showed that turbulent free convection also had to be considered. Both heat transfer mechanisms contribute to the homogenization of the wall temperature and the deformation of the temperature field in the rock matrix around the cave.…”

Section: Introductionmentioning

confidence: 79%

Modeling Heat Transfer for Assessing the Convection Length in Ventilated Caves

Sedaghatkish,

Pastore,

Doumenc

et al. 2024

JGR Earth Surface

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The present study focuses on heat transfer in ventilated caves for which the airflow is driven by the temperature contrast between the cave and the external atmosphere. We use a numerical model that couples the convective heat transfer due to the airflow in a single karst conduit with the conductive heat transfer in the rock mass. Assuming dry air and a simplified geometry, we investigate the propagation of thermal perturbations inside the karst massif. We perform a parametric study to identify general trends regarding the effect of the air flowrate and conduit size on the amplitude and spatial extent of thermal perturbations. Numerical results support the partition of a cave into three regions: (a) a short (few meters) diffusive region, where heat mainly propagates from the external atmosphere by conduction in the rock mass; (b) a convective region where heat is mainly transported by the air flow; (c) a deep karst region characterized by quasi‐constant temperatures throughout the year. Numerical simulations show that the length of the convective region is approximately proportional to the amplitude of the flowrate annual fluctuations divided by the square root of the cave radius. This result is tested against field data from a mine tunnel and two caves. Our study provides first estimates to identify climate sensitive regions for speleothem science and/or ecosystemic studies.

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Section: Introductionmentioning

confidence: 79%

Modeling Heat Transfer for Assessing the Convection Length in Ventilated Caves

Sedaghatkish,

Pastore,

Doumenc

et al. 2024

JGR Earth Surface

Self Cite

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“…In closed caves with little or no ventilation, heat transfer between the cave and the external atmosphere is mainly due to conduction in the rock mass. In shallow caves (depth of the order of 10 m), depth variations all along the cave modify the damping and phase shift of the thermal fluctuations, inducing temperature gradients inside the cave, which generate turbulent free convection (Qaddah et al, 2022) and radiative heat transfer (Qaddah et al, 2023). These heat transfer mechanisms contribute in turn to the homogenization of the wall temperature and the deformation of the temperature field in the rock matrix around the cave (Guerrier et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Modelling heat transfer for assessing the convection length in ventilated caves

Sedaghatkish,

Pastore,

Doumenc

et al. 2024

Preprint

View full text Add to dashboard Cite

The present study focuses on heat transfer in ventilated caves for which the airflow is driven by the temperature contrast between the cave and the external atmosphere. We use a numerical model that couples the convective heat transfer due to the airflow in a single karst conduit with the conductive heat transfer in the rock mass. Assuming dry air and a simplified geometry, we investigate the propagation of thermal perturbations inside the karst massif. We perform a parametric study to identify general trends regarding the effect of the air flowrate and conduit size on the amplitude and spatial extent of thermal perturbations. Numerical results support the partition of a cave into three regions: (1) a short (few meters) diffusive region, where heat mainly propagates from the external atmosphere by conduction in the rock mass; (2) a convective region where heat is mainly transported by the air flow; (3) a deep karst region characterized by quasi-constant temperatures throughout the year. An estimation of the length of the convective region is proposed and compared to field data from a mine tunnel and two caves. Our results provide first estimates to identify climate sensitive regions for speleothem science and/or ecosystemic studies.

show abstract