A numerical method for determination of moisture transfer coefficient according to the diffusion moisture profiles

For a set of the measured diffusion moisture profiles, a numerical method for determination of moisture transfer coefficient D ( w, t ) is suggested. The transfer coefficient is found as a sum of the degree and exponential functions of the moisture concentration w , as opposite to the previous works...

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Bibliographic Details
Published in:Physics of particles and nuclei letters 2008-05, Vol.5 (3), p.282-285
Main Authors: Pavlušová, E., Pavluš, M., Sarhadov, I., Amirkhanov, I. V., Puzynina, T. P., Puzynin, I. V.
Format: Article
Language:English
Subjects:
Particle and Nuclear Physics
Physics
Physics and Astronomy
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Summary:For a set of the measured diffusion moisture profiles, a numerical method for determination of moisture transfer coefficient D ( w, t ) is suggested. The transfer coefficient is found as a sum of the degree and exponential functions of the moisture concentration w , as opposite to the previous works. The exponent p(t) of the power function depends on time t . The exponential function describes profiles for large times nearby the boundary of the sample, where the moisture evaporation takes place to the atmosphere. A conservative difference scheme for numerical solution of direct problem is suggested. An inverse problem for minimization of an error functional is solved by the Newton method. Thus, a more accurate coincidence of the calculated profiles of the moisture concentration to the measured profiles is gained.
ISSN:1547-4771
1531-8567
DOI:10.1134/S1547477108030308