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Abstract�� A simplification for Sheng and Peck's freeze-drying model with heat radiation has been made in this paper.Linear distribution of temperature within the dried layer during sublimation is assumed instead of the error function profile proposed by Sheng and Peck.Therefore,an explicit expression for predicting the time required to remove the free water and the bound water in products during a freeze-drying process has been developed.The model suggests that sublimation and desorption may take place simultaneously in the sublimation stage.Good agreement has been found by comparing with Sheng and Peck's prediction data for freeze-drying of beef and poultry meat.The method is suitable for engineering application because of its simplicity.

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Received 2002-01-15; published 2002-01-15

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�̽�,ͿΰƼ,��׿��,�»��.��䴫��䶳��ʵļ�ݹ��[J]. ��ѧ��ҵ�빤��, 2002,19(1): 107-112

CHENG Jiang,TU Wei-ping,YANG Zhou-ru,CHEN Huan-qin .Estimation of the Rates for Freeze-Drying with Heat Radiation[J]. Chemcial Industry and Engineering, 2002,19(1): 107-112