This paper describes a tracer response analysis for water-steam flow through a porous medium. The experiments are carried out by using a packed, glass beads bed submerged horizontally in a thermostat at a temperature of more than 373K. Water is injected continuously into the bed under a constant pressure gradient and is heated from the surrounding, and a part of the water vaporizes in the bed. When the temperature and the flow rates of steam and hot water attain to be steady, 0.5 cm3 of ammonia water solution (about five volume percent of NH3) is injected into the bed as a tracer by using a syringe for a few seconds. The tracer vaporizes in the bed, and ammonia gas flows out of the bed with steam. Then, the NH3 content in the exit gas is measured by a gas chromatography every a few minutes. The experimental results of tracer response are analyzed by a onedimensional, mathematical model which describes mass transfer in water-steam flow under the boiling condition. The conclusions are as follows: (1) The mathematical model proposed in this paper describes experimental tracer response in gas phase of water-steam flow accompanied by boiling. (2) The analysis of the tracer response gives the leading edge of boiling (the position at which water starts to boil in a porous medium). (3) The theoretical value of the leading edge of boiling is consistent with the experimental one.
|Number of pages||16|
|Journal||journal of the geothermal research society of japan|
|Publication status||Published - 1992 Jan|
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