Theoretical analysis of vacuum freeze drying of biomaterials at contact-radiant-microwave heating

• Autorzy: Nastaj J. , Witkiewicz K.

Warianty tytułu

PL

Analiiza teoretyczna suszenia sublimacyjnego biomateriałów z ogrzewaniem kontaktowo-radiacyjno-mikrofalowym

• Języki publikacji: EN

Abstrakty

EN

In the numerical modelling of the vacuum freeze drying of biomaterials (fodder yeast, lactose, milk biopreparation and sulphamerazine) at combined contact-radiant-microwave heating, the explicit MacCormack finite differences method was employed for solving two-region parabolic plane moving boundary problem (PPLMBP) with heat generation in both frozen and dried regions and unknown a priori sublimation temperature T[s](t) at moving ice sublimation front. Simulation of vacuum freeze drying process of biomaterials at combined contact-radiant-microwave heating was made, and additionally, the influence both steady capacity and relaxation time of internal heat source capacity has been discussed. A method of experimental determination of the [mi[i]] and [tau[s(i)]] parameters was also presented.

PL

W modelowaniu matematycznym suszenia sublimacyjnego biomateriałów (drożdże paszowe, laktoza, biopreparat mleczarski, sulfamerazyna) z ogrzewaniem kombinowanym kontaktowo-radiacyjno-mikro-falowym zaproponowano jawną metodę różnic skończonych MacCormacka do rozwiązywania parabolicznych problemów płaskiej ruchomej granicy z generacją ciepła w dwóch obszarach: zamrożonym i wysuszonym oraz nieznaną a priori temperaturą ruchomego frontu sublimacji lodu Ts(t). Przeprowadzono analizę wpływu ustalonej wydajności wewnętrznego źródła ciepła oraz czasu relaksacji wydajności tego źródła na proces suszenia. Przedstawiono także sposób wyznaczania na drodze pomiarowej wartości parametrów mi[i] and tau[s[i]].

Słowa kluczowe

PL

biomateriały; ogrzewanie kontaktowo-radiacyjne; ogrzewanie mikrofalowe; suszenie sublimacyjne; źródło ciepła a proces suszenia

• Wydawca: Komitet Inżynierii Chemicznej i Procesowej Polskiej Akademii Nauk
• Czasopismo: Inżynieria Chemiczna i Procesowa
• Rocznik: 2004
• Tom: T. 25, z. 2
• Strony: 505--525
• Opis fizyczny: Bibliogr. 21 poz.

Twórcy

autor

Nastaj J.

• Department of Chemical Engineering and Environmental Protection Processes Technical University of Szczecin, al. Piastów 42, 71-065 Szczecin, Poland

autor

Witkiewicz K.

Bibliografia

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