Conjugate heat transfer in artificial ground freezing using enthalpy-porosity method: Experiments and model validation

Alzoubi, Mahmoud A.; Sasmito, Agus P.; Sasmito, Agus P.

doi:10.1016/j.ijheatmasstransfer.2018.05.059

Cited by 72 publications

(15 citation statements)

References 25 publications

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“…It should be noted that when performing hydrothermal coupling numerical calculations, there is another commonly modeling methodology called the enthalpy-porosity method [19,20], where the water-ice phase-change interface is modeled as a mushy zone. e transformation from water to ice in this zone is considered as a porous medium, where a modified Darcy source term is used to simulate motion in the phase-change region.…”

Section: Water Flow Field Equationmentioning

confidence: 99%

“…e Darcy term S D and inertial term S E make up the total resistance to the flow. At no-seepage, or low seepage velocity, the inertial term is so low that can be safely neglected [19,20]. C E is the Ergun coefficient.…”

Section: Water Flow Field Equationmentioning

confidence: 99%

“…e buoyancy source term S B is used to induce the natural convection within the voids, where g → is the gravitational acceleration, and β l is the thermal expansion coefficient. e mushy source term S m is a modified Darcy source term that is introduced to control the freezing process within the mushy zone [19,20]. As the temperature of the soil gradually decreases, the liquid fraction c within the pore fluid gradually reduces to 0, and mushy source term S m dominates all other terms in the momentum equation (26) and forces the superficial velocity close to zero [19,20].…”

Section: Water Flow Field Equationmentioning

confidence: 99%

“…is numerical model has been well verified by the results of three-dimensional ground freezing experiments under high seepage velocity conditions. Alzoubi et al [19,20] conceived and developed a controlled laboratory scale AGF experimental rig and developed a threedimensional conjugate mathematical and numerical model of the bayonet freeze pipes and porous ground structure using enthalpy-porosity method. e model was further validated against global heat balance and local temperature distributions from experiments at various operating conditions.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Study on the Formation Law of the Freezing Temperature Field of Freezing Shaft Sinking under the Action of Large-Flow-Rate Groundwater

Wang

Rong

Lin

et al. 2019

Advances in Materials Science and Engineering

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Taking into account moisture migration and heat change during the soil freezing process, as well as the influence of absolute porosity reduction on seepage during the freezing process, we construct a numerical model of hydrothermal coupling using laws of conservation of energy and mass. The model is verified by the results of large-scale laboratory tests. By applying the numerical calculation model to the formation of artificial shaft freezing temperature fields under the action of large-flow groundwater, we conclude that groundwater with flow rates of less than 5 m/d will not have a significant impact on the artificial freezing temperature field. The maximum flow rates that can be handled by single-row freezing pipes and double-row freezing pipes are 10 m/d and 20 m/d, respectively, during the process of freezing shaft sinking. By analyzing the variation of groundwater flow rate during freezing process, we find that the groundwater flow velocity can reach 5–7 times the initial flow velocity near the closure moment of the frozen wall. Finally, in light of the action characteristics of groundwater on the freezing temperature field, we make suggestions for optimal pipe and row spacing in freezing pipe arrangement.

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Section: Water Flow Field Equationmentioning

confidence: 99%

Section: Water Flow Field Equationmentioning

confidence: 99%

Section: Water Flow Field Equationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Study on the Formation Law of the Freezing Temperature Field of Freezing Shaft Sinking under the Action of Large-Flow-Rate Groundwater

Wang

Rong

Lin

et al. 2019

Advances in Materials Science and Engineering

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“…To limit the movement of upper structures and remain construction safety, some advanced research on frost heave has been carried out based on a prototype project. Here, a similarity simulation method is an effective means to investigate complex problems in engineering projects [28][29][30][31][32][33]. The freezing similarity simulation experiments have also been adopted for predicting frost heave and settlement in the AGF engineering cases.…”

Section: Introductionmentioning

confidence: 99%

Influence of Different Freezing Modes on the Base Slab Displacement of an Upper Structure

Wang

et al. 2019

Applied Sciences

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The high risk of metro tunnels that are underneath buildings in a water-rich layer has received much attention. The base slab of an upper structure deforms due to frost heave and settlement, which needs to be predicted before freezing and excavation. In this paper, simulation experiments with a similarity ratio of 1/25 were performed based on an engineering project where two tunnels underpass a running station through an artificial ground freezing method. The displacement of upper structures was analyzed under simultaneous and sequential freezing modes, with a simple formula proposed to estimate the frost heave in closely underpassing projects. It is shown that, under freezing and excavation stages, the base slab displacement displays a zigzag shape. These results are instructive to the construction of underpassing projects in a water-rich layer.

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Experimental research on microscopic and macroscopic damage evolution of artificial frozen sandy gravel

Wu,

Yan,

Liu

et al. 2024

Bull Eng Geol Environ

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Conjugate heat transfer in artificial ground freezing using enthalpy-porosity method: Experiments and model validation

Cited by 72 publications

References 25 publications

Study on the Formation Law of the Freezing Temperature Field of Freezing Shaft Sinking under the Action of Large-Flow-Rate Groundwater

Study on the Formation Law of the Freezing Temperature Field of Freezing Shaft Sinking under the Action of Large-Flow-Rate Groundwater

Influence of Different Freezing Modes on the Base Slab Displacement of an Upper Structure

Experimental research on microscopic and macroscopic damage evolution of artificial frozen sandy gravel

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