Thermodynamic properties for the convection of steam-water-CO 2 mixtures

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ID: 309078
1981
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Abstract
Geothermal fluids often contain considerable quantities of gases such as CO/sub 2/, H/sub 2/S, CH/sub 4/, N/sub 2/ and H/sub 2/. If these gases are present in sufficiently large concentrations, they can influence profoundly the physical state of the geothermal system. Such is the case at the Broadlands geothermal field. New Zealand, for example, where the fluid contains about 4 wt% CO/sub 2/. This paper presents calculations of the thermal expansivity, isothermal compressibility, specific heat at constant pressure, and adiabatic temperature gradient for steam-water-CO/sub 2/ mixtures as functions of temperature for pressures of 1, 50, 100, and 200 bars and CO/sub 2/ mass fractions of 0.02, 0.04, and 0.06. The thermal expansivity of the mixture can be as large as 100 times that of liquid water and is typically 10 times as large. The mixture is also substantially more compressible (by a factor of 10 to 10/sup 5/) than is liquid water and has a specific heat typically 10 times that of water. It also has an adiabatic temperature gradient larger than that of liquid water. Depth profiles of these properties are calculated for the measured temperatures and pressures in the Broadlands geothermal field prior to exploration.
Reference Key
openalex_W2090939461 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors G. Schubert, Joe M. Straus
Journal american journal of science
Year 1981
DOI
10.2475/ajs.281.3.318
URL
https://doi.org/10.2475/ajs.281.3.318
Keywords Keywords not found

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