Numerical Simulation of the Influence of Flow Velocity on Granite Temperature Field Under Thermal Shock
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Numerical Simulation of the Influence of Flow Velocity on Granite Temperature Field Under Thermal Shock Xinghui Wu . Peitao Wang . Qifeng Guo . Jie Zhang . Meifeng Cai
Received: 20 March 2020 / Accepted: 9 April 2020 Ó Springer Nature Switzerland AG 2020
Abstract Under thermal shock, the heat conduction between granite and fluid will lead to the redistribution of rock temperature field, while indoor thermal shock test cannot determine the distribution rule of temperature field inside granite accurately. In order to explore the influence of fluid velocity on the thermal shock process of granite, the temperature field and flow field is numerically simulated by COMSOL. The results show that heat transfer between granite and fluid is in the form of waves. In the process of heat conduction, the internal temperature and heat balance time of granite are greater than those of rock surface. The time of heat balance in rock provides reference for the design of indoor thermal shock test. After thermal shock, the temperature of granite is lower than the initial temperature. With the increase of fluid velocity, the thermal equilibrium time of granite decreases, and the final rock stable temperature decreases. According to the relationship between velocity and granite
X. Wu (&) P. Wang (&) Q. Guo J. Zhang M. Cai School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China e-mail: [email protected] P. Wang e-mail: [email protected] X. Wu P. Wang Q. Guo J. Zhang M. Cai Beijing Key Laboratory of Urban Underground Space Engineering, School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China
temperature, a linear correlation model between velocity and maximum instantaneous thermal shock velocity is proposed. It is also verified that the thermal fluid–solid coupling model of granite under thermal shock is feasible to simulate the heat conduction and temperature distribution in granite. Keywords Thermal shock Temperature field distribution Flow velocity Thermal shock velocity
1 Introduction In the rapid development stage of global economy, resources and energy are two important supports for the development of international economy, and the exploitation of resources and energy is very important for economic development (Guo et al. 2020a). The exploitation of both deep mineral resources and geothermal energy involves large-scale rock engineering excavation, and the influence of thermal shock of cold water on high-temperature rock cannot be ignored during the excavation of deep rock mass. The rock is an inhomogeneous body formed by cementation of different mineral components, and there are lots of cement and fractures in the rock (Guo et al. 2020b). When the high temperature rock is impacted by thermal shock, the thermal expansion coefficients of the mineral particles in the rock are different. After thermal shock, the deformat
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