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5Hydrogen detectors
MATHEMATICAL MODEL OF THE DYNAMICS OF HYDROGEN INTERACTION WITH THE SENSOR SURFACE UNDER THE CONDITIONS OF LOW TEMPERATURES AND WATER VAPOUR INFLUENCE
M. V. Vedernikov, M. M. Pen'kov, I. V. Naumchik
Mozhaisky Military Space Academy 13 Zhdanovskaya nab., St. Petersburg, 197082, Russia Phone: (812) 235-85-55
A mathematical model has been proposed for the dynamics of interaction between hydrogen-water mixtures and the sensor surface in vacuum and under low temperature conditions as well as allowing for the heat of hydrogen conversion ortho-steam at lower temperatures.
The model developed is based on the accounting of the Stefan flux. It has been demonstrated that the flux considerably affects the mass transfer and becomes the determining factor for sorbents with sufficiently big transportation pores (ceolit adsorbents), which leads to the appearance of new effects. Upon gas mixture adsorption, the concentration of a weakly sorbed component in transportation grain pores can be higher than the con-
centration of the given component outside the grain. During the initial period of the adsorption process, the convective Stefan flux has various directions over the grain radius, i. e. it is directed to the sorption area, both outside the grain and from its centre.
The analysis of the mathematical model of adsorption on a grain will allow the averaging of temperature and concentration profiles through the grain and simplifies models of the joint water-hydrogen kinetics on the grain. On the basis of the simplified kinetics model, a model has been developed for the dynamics of multicomponent non-isothermal adsorption in the layer allowing engineering and process calculations to be made.
ISJAEE Special issue (2003)
