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Date of Publication:2013-01-01

Journal:大连理工大学学报

Issue:6

Page Number:811-815

ISSN No.:1000-8608

Abstract:Experiments are carried out to simulate the flow characteristics in a large horizontal falling film evaporator of desalination plant .The tube bundle arrangements are regular triangle and rotated square ,and the relative tube bundle-pitch ratio is 1 .3 , a typical value for evaporators used in desalination .Experiments are conducted with saturated temperature ranging from 50 ℃ to 70 ℃ and spray density ranging from 0 .02 kg·m-1·s-1to 0. 08kg·m-1·s-1. The influences of these factors ,such as tube arrangement ,spray density and saturated temperature on steam flow resistance are analyzed .The experimental results show that the steam flow resistance across regular triangle tube bundle is bigger than that across rotated square tube bundle .Parameters Rel ,Reg ,slo/D ,str/D are employed to fit the prediction formula .Based on the experimental data ,a pressure drop correlation for steam flowing across horizontal tube bundle with falling film is proposed with a standard deviation of ± 15% .

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