Author:
Jebson R. Selwyn,Iyer Mani
Abstract
SummaryThe performances of falling film evaporators used in the New Zealand dairy industry for concentrating skim milk, whole milk and buttermilk were evaluated by determining (1) the kg steam used per kg water evaporated, and (2) the heat transfer coefficient of each pass in the evaporators. A computer program was used to calculate the results. The heat transfer coefficients varied from 0·3 to 3·2 kW/m2 per °C and the steam consumption from 0·4 to 0·09 kg steam/kg evaporation. The viscosity of the feed and the momentum of the vapours passing down the tubes were found to be the main factors controlling the heat transfer coefficient. A correlation between the heat transfer coefficient and these factors is presented. Other factors likely to have an influence on the performance are discussed.
Publisher
Cambridge University Press (CUP)
Subject
Animal Science and Zoology,General Medicine,Food Science
Reference11 articles.
1. Falling film evaporators - A design equation for heat transfer rates
2. Jebson R. S. 1988 The performances of falling film evaporators. Proceedings, IPENZ (Institution of Professional Engineers of New Zealand) Annual Conference vol. 2 pp. 195–204
3. Forced convection condensation in the presence of noncondensables and interfacial resistance
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