I have a question about calculating the 'U' value when a jacketed pressure vessel is either (1) not agitated at all, or (2) agitated using a pump, not an impeller. I'm only familiar with determining the U value for agitated vessels where the Nusselt number is determined by heat transfer correlations. This method requires a Reynold's number, which needs an impeller diameter, which I don't have. Do you have any suggestions?
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Jim Grant Forum Moderator 114 Posts
Re: How do I calculate the vessel side heat transfer coefficient?21 February 2012 at 1:29pmThe recommended approach to calculating the vessel side heat transfer coefficient is to utilize the power input per unit volume. See J.R. Bourne, Buerli and Regenass published in Chemical Engineering Science (Vol. 36, pp 347-354, 1981). If there is no agitation at all then it is best to calculate a natural convection film coefficient. See Perry's Chemical Engineers' Handbook, Chapter 5.