TY - JOUR
TI - Compressed air-flow and physical property in mine tunnels during cyclic charging and discharging
AU - Cai Cheng-Zheng
AU - Zhu Zheng-Chao
AU - Zou Zeng-Xin
AU - Wang Bo
AU - Li Jia-Cheng
AU - Zhou Yue-Jin
JN - Thermal Science
PY - 2025
VL - 29
IS - 2
SP - 1145
EP - 1151
PT - Article
AB - This paper utilizes CFD methods to simulate high pressure gas charging and  dis­charging in a horseshoe-shaped tunnel. Simulation results reveal linear  pressure and temperature variations during charging and discharging cycles,  with stabi­lized trends after several cycles. The evolution of air physical  properties such as density, viscosity, thermal conductivity, and specific  heat capacity within the tunnel is also analyzed. The air density increases  with pressure and decreases with tem­perature, stabilizing after several  cycles. Viscosity and thermal conductivity exhibit similar trends to  temperature, with minor variations throughout the cycle. Specific heat  capacity increases during gas charging, remains constant during storage, and  decreases during gas release. The study contributes to the optimization of  CAES systems in abandoned coal mines by providing detailed insights into  air-flow and heat transfer characteristics.