Frontal Regime of Heat and Mass Transfer in a Geothermal Bed
Based on an earlier proposed mathematical model, the conditions for the existence of a frontal regime of steam extraction from a high-temperature bed have been derived. It is shown that unlike the familiar one-dimensional case, in the radial-symmetrical model considered the radius of the region occupied by steam tends to a limiting value, that is, the front of boiling that separates the regions of water and steam practically comes to a stop after a time. A formula has been derived pointing clearly to the dependence of the indicated limiting value of the front radius on the water and steam parameters as well as on the characteristics of the geothermal bed. It is shown that for the steam to occupy a considerable region around the well when the bed is in service, it is necessary that the initial state of water be close to that of steam generation. Otherwise the front of boiling in the considered regime of heat and mass transfer extends from the well only a little.
Keywordssteam generation in a bed heat and mass transfer flow regimes radial model analytical solution
Unable to display preview. Download preview PDF.
- 1.J. Elder, Geothermal System, Academic Press, New York (1981).Google Scholar
- 2.M. A. Grant, I. J. Donaldson, and P. F. Bixley, Geothermal Reservoir Engineering, Academic Press, New York (1982).Google Scholar
- 3.G. G. Tsypkin, Mathematical model of water–steam phase transitions in hydrothermal beds, Izv. Ross. Akad. Nauk, Mekh. Zhidk. Gaza, No. 6, 94–105 (1994).Google Scholar
- 6.A. B. Alkhasov, Geothermal Power Engineering: Problems, Resources, Technologies [in Russian], Fizmatlit, Moscow (2008).Google Scholar
- 7.G. G. Tsypkin, Flows with Phase Transitions in Porous Media [in Russian], Fizmatlit, Moscow (2009).Google Scholar
- 10.N. N. Verigin and V. S. Golubev, On vapor generation in underground beds-collectors, Dokl. Akad. Nauk, 223, No. 6, 1355–1358 (1975).Google Scholar
- 12.M. J. O′Sullivan, Geothermal reservoir simulation, Energy Res., 9, 313–332 (1985).Google Scholar