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Turbulent heat transfer in drag reducing fluids
Author(s) -
Wells C. Sinclair
Publication year - 1968
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690140313
Subject(s) - nusselt number , drag , parasitic drag , mechanics , heat transfer , turbulent prandtl number , prandtl number , churchill–bernstein equation , thermodynamics , turbulence , drag coefficient , reynolds number , pressure drop , dynamic scraped surface heat exchanger , heat transfer coefficient , physics , critical heat flux
Abstract An analysis is presented which extends the analogy between energy and momentum transport for turbulent pipe flow of purely viscous fluids to include drag reducing, non‐Newtonian fluids. The correlation by Meyer is used to predict friction factor and sublayer thickness for the drag reducing fluids. The use of the friction factor correlation with the heat transfer analogy makes it possible to predict heat transfer rates from simple measurements of pressure drop and flow rate for the drag reducing fluids. Some recent experimental data for two effective drag reducing fluids and for water are compared with the predicted heat transfer rates, and the mean deviation in Nusselt number is found to be +8.5% for all of the data. The heat transfer analysis predicts a reduction in Nusselt number accompanying a reduction in friction factor for a given Reynolds number and for Prandtl numbers greater than 1.