On pressure-work,viscous dissipation and the energy balance relation for geothermal reservoirs |
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| Authors: | SK Garg JW Pritchett |
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| Institution: | Systems, Science and Software, P. O. Box 1620, La Jolla, California 92038, USA |
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| Abstract: | This article examines the conditions under which the pressure-work and viscous dissipation terms should be retained in the energy balance relation for single (liquid water or vapor) and two-phase (liquid water and vapor) fluid flow through porous media. It is shown that if one wishes to retain the pressure-work term, then one must also keep the viscous dissipation term in the energy balance. Consideration of steady non-isothermal radial flow demonstrates that both pressure-work and viscous dissipation are liable to have negligibly small effects in single phase liquid water and in two-phase liquid-vapor systems. This conclusion is, however, not generally valid for pure vapor systems; in this case, pressure-work and viscous dissipation can produce significant variations in the computed reservoir response. |
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