Experimental investigation of the hydraulic and heat-transfer properties of artificially fractured granite

Luo, Jun; Zhu, Yongqiang; Guo, Qinghai; Tan, Long; Zhuang, Yaqin; Liu, Mingliang; Zhang, Canhai; Xiang, Wei; Rohn, Joachim

doi:10.1038/srep39882

Cited by 42 publications

(16 citation statements)

References 29 publications

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“…As it is shown in Equation (1), the hydraulic conductivity is proportional to the aperture and inversely proportional to the kinematic viscosity of fluid. It has been previously reported that water viscosity decreases from 100.5 × 10 −5 to 28.38 × 10 −5 Pa·s when the temperature increases from 20 to 100 • C (25). The viscosity of the water decreases relatively rapidly at a low temperature range, resulting in an increase of hydraulic conductivity.…”

Section: Influence Of Confining Pressurementioning

confidence: 95%

“…Based on the experimental results, Li proposed heat transfer correlations. Luo et al [25] tested the hydraulic properties of artificial fractured granite under different confining pressure and temperature, then further studied the heat transfer efficiency under coupled hydro-thermal-mechanical conditions. It was found that the hydraulic property depends largely on the surface area of the fractures.…”

Section: Description Of the Samplesmentioning

confidence: 99%

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Investigation of Flow and Heat Transfer Characteristics in Fractured Granite

Luo

Zhao

et al. 2018

Energies

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Hydraulic and heat transfer properties of artificially fractured rocks are the key issues for efficient exploitation of geothermal energy in fractured reservoirs and it has been studied by many previous researchers. However, the fluid temperature evolution along the flow path and rock temperature changes was rarely considered. This study investigated flow and heat transfer characteristics of two sets of fractured granite samples each with a single fissure. The samples were collected from a geothermal reservoir of Gonghe basin in Qinghai province in China. The results show that the larger area ratio, the higher hydraulic conductivity exhibited. Hydraulic conductivity of fractured rock masses is positively proportional to injection pressure, but inversely proportional with both confining pressure and temperature. In order to analyze heat transfer during the flow process, temperature distribution along the flow path in a fracture was monitored. The temperature of the fluid was determined to increase with distance from the flowing inlet. Increasing the temperature of the rock or decreasing the injection pressure will raise the temperature at the same location. Furthermore, in order to understand the heat transfer in rock mass, temperature distribution was observed by using an infrared thermal camera. Finally, the energy exchange efficiency during the flowing process was examined. The energy exchange rate increases continuously with the rock temperature, with an effective stress ratio of 1:2.

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Section: Influence Of Confining Pressurementioning

confidence: 95%

Section: Description Of the Samplesmentioning

confidence: 99%

Investigation of Flow and Heat Transfer Characteristics in Fractured Granite

Luo

Zhao

et al. 2018

Energies

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“…Figure 2 shows the physical structure model of heat transfer. Luo et al [35,36] analyzed the heat transfer phenomenon in the flow process, and results showed that heat flow is a process of energy exchange. Therefore, the author divides the heat transfer process into three types: linear, curved, and spiral.…”

Section: Causes Of Formation Of High Ground Temperaturementioning

confidence: 99%

Mechanical Properties and Microstructure of Shotcrete under High Temperature

Liu

Zhao

Zhang³

et al. 2021

Applied Sciences

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High temperature is recognized as one of the extreme environments in the application of shotcrete which significantly deteriorate the performance of shotcrete. This paper reviews the mechanical properties and microstructure of shotcrete under high temperature. First of all, this paper reviews the cause of formation of high ground temperature. Based on these causes, the author establishes a heat transfer model with a spiral shape by introducing a multidimensional morphological formula into the heat conduction process. Then, the paper reviews the influence of high temperature on the mechanical and micro properties of shotcrete, the cooling technology under high temperature, and the optimization research technology of shotcrete. The author discusses the influence of high temperature on the thermal parameters and the deformation of shotcrete from the perspective of thermodynamics. Multiple studies have shown that the irregular movement and disorderly overlapping of molecules in the shotcrete caused by the high temperature environment result in the premature termination of the hydration reaction of cement in shotcrete. Finally, the author suggests the challenges of high-temperature shotcrete in term of the process structure, performance optimization, and application in special engineering fields. The research in this paper intends to give guidance to those conducting shotcrete research under high temperature, and to promote the further development of shotcrete technology.

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“…Additionally, the response of a rock fracture to THMC processes also depends on the morphology of the fracture surfaces (Pyrak-Nolte and Morris 2000). Size and spatial distribution of mechanical apertures as well as contact areas directly influence the hydraulic characteristics of the fracture, where large mean mechanical apertures and pronounced roughnesses tend to result in higher hydraulic conductivities and larger hydraulic aperture variations when mechanical loads change (Bandis et al 1983;Luo et al 2017). The spatial correlation of fracture aperture fields is also expected to play a significant role in the response of the fracture to increased compressive stresses, as a high spatial correlation results in preferential flow channels.…”

Section: Figmentioning

confidence: 99%