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Experimental study of heat transfer between fluid flowing through fracture surface with tortuous seepage path

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  • Ma, Yueqiang
  • Gan, Quan
  • Zhang, Yanjun
  • Yuan, Xuebing

Abstract

Under the dual challenges of energy demand and environmental protection, geothermal energy has broad application prospects because of their cleanliness and huge reserves. Understanding the flow and heat transfer process of fluid flowing through fractured rock is of importance for the utilization of geothermal resources. A more practical calculation equation for convective heat transfer coefficient is derived based on Newton's cooling equation and previous research. Samples with different seepage paths were prepared through 3D printing technology and cement mortar pouring method. The effect of seepage path tortuosity, aperture, and initial temperature on the characteristics of heat transfer were analyzed and discussed by conducting the seepage and heat transfer test. The experimental results show that the overall convective heat transfer coefficient of sample with seepage path are lower than those of sample with smooth fractures. The greater the tortuosity of seepage path, the greater the overall convective heat transfer coefficient. In addition, the correlation of tortuosity and C, n in the characteristic number equation is proposed, providing significant parameters for the study of hydraulic-mechanical-thermal coupling when fluid flowing through rock mass with high temperature.

Suggested Citation

  • Ma, Yueqiang & Gan, Quan & Zhang, Yanjun & Yuan, Xuebing, 2022. "Experimental study of heat transfer between fluid flowing through fracture surface with tortuous seepage path," Renewable Energy, Elsevier, vol. 188(C), pages 81-95.
    • Handle: RePEc:eee:renene:v:188:y:2022:i:c:p:81-95
    DOI: 10.1016/j.renene.2022.02.026
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    References listed on IDEAS

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    1. Shu, Biao & Zhu, Runjun & Elsworth, Derek & Dick, Jeffrey & Liu, Shun & Tan, Jingqiang & Zhang, Shaohe, 2020. "Effect of temperature and confining pressure on the evolution of hydraulic and heat transfer properties of geothermal fracture in granite," Applied Energy, Elsevier, vol. 272(C).
    2. Li, Zheng-Wei & Feng, Xia-Ting & Zhang, Yan-Jun & Zhang, Chi & Xu, Tian-Fu & Wang, Yun-Sen, 2017. "Experimental research on the convection heat transfer characteristics of distilled water in manmade smooth and rough rock fractures," Energy, Elsevier, vol. 133(C), pages 206-218.
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