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KMID : 0380619910230040437
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Korean Journal of Food Science and Technology
1991 Volume.23 No. 4 p.437 ~ p.441
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Effect of Feeding Rate for Operation Properties of Centrifugal Thin Film Evaporator
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박무현/Park, Moo Hyun
한봉호/김병삼/박노현/Han, Bong Ho/Kim, Byeong Sam/Park, Noh Hyun
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Abstract
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During the evaporation of garlic juice by centrifugal thin film evaporator (Centri-Therm, CT-1B), the effect of feeding rate was investigated for its operation properties. On the process condition of feeding rate of 25 to 125 kg/h, theoretical average thickness of the garlic juice film on the rotating cone and residence time of the juice in the evaporator varied in the range of 0.52 to 0.89 mm and 1.77 to 6.75 second, respectively. And the flow of garlic juice was considered as a streamline flow by Reynolds number. At constant temperatures of steam and juice evaporation, concentration ratio decreased with the increase of the feeding rate. But the evapoartion rate and overall heat transfer coefficient increased with the increase of the feeding rate until the feeding rate reached a certain value and then decreased. On the conditions of 25$lt;feeding rate ≤125 kg/h, evaporation temperature of 40℃, 95≤steam temperature≤120℃ and initial feed concentration of 32°Brix, concentration ratio and overall heat transfer coefficient were 1.04-2.04 and 3,074.33∼17,614.70 kJ/㎡·h·℃.
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