Ceramics-Silikáty 34, (2) 97 - 102 (1990) |
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DIFFUSION OF WATER THROUGH CERAMIC MIX IN ALTERNATING ELECTRIC FIELD - PART I. THE DIFFUSION PAIR MET HOD WITH AN INNER ELECTRIC HEAT SOURCE
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Havrda Jiří, Gregorová Eva, Oujiří František,
Azizi Hossein
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Institute of Chemical Technology, Deparment of Silicate Technology, Suchbátarova 5, 166 28 Prague
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The diffusion coefficient of water was determined by means of the diffusion pair method using an inner electric heat source and based on determining the moisture content profiles in pairs at various temperatures. The diffusion coefficient values obtained over the temperature range T ε (298K; 322.5K) were approximated by the relationship
D = (1123. 5 exp (-7655/T)) m²s⁻¹
A comparison of the relationship obtained with that established by the same method without passage of alternating electric current proves that the effects of electric current speed up diffusion of water through a saturated porcelain mix with a saturated boundary. |
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