Analytical and experimental studies of heat convection by water flow in rock fractures

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Heat transfer analysis forms a major part of the studies of hot dry rock geothermal energy systems. Heat transfer from rock mass to working fluid is through convection in rock fractures. Analytical solutions of heat convection are based on the boundary layer concept and involve the principles of heat conduction and fluid dynamics. The convective heat transfer coefficient is found to be a function of the thermal conductivities of rock and water, flow velocity, dynamic and kinematic viscosities, specific heat, and geometry of the rock fracture. Measurements on rock-fluid heat transfer were collected during the flow experiments. The results showed that the convective heat transfer coefficient varies from 200 to 1400 W/m-° C, and is proportional to the flow velocity.

Original languageEnglish
Number of pages6
Publication statusPublished - 1 Jan 1992
Externally publishedYes
EventUS Symposium on Rock Mechanics 1992 - Santa Fe, United States of America
Duration: 3 Jun 19925 Jun 1992
Conference number: 33rd


ConferenceUS Symposium on Rock Mechanics 1992
Abbreviated titleUSRMS 1992
CountryUnited States of America
CitySanta Fe

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