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ISSN Online: 2377-424X

ISBN Print: 0-89116-130-9

International Heat Transfer Conference 6
August, 7-11, 1978, Toronto, Canada

LOCAL HEAT TRANSFER COEFFICIENTS IN WIPED-FILM HEAT EXCHANGERS

Get access (open in a dialog) DOI: 10.1615/IHTC6.3940
pages 1-6

要約

The instantaneous heat transfer coefficients in a wiped-film heat exchanger have been determined using the electrochemical technique for a two-bladed, 78.7 mm. I.D. exchanger. The time-averaged local heat transfer coefficients were found to agree fairly well with those of Azoory and Bott (1); however, some variation with liquid flowrate was detected. The time-averaged local Nusselt number was found to be represented by
Nu = 0.15 (RerPr)1/2 Rewa with a = (1.−6.24×10−4 N)/9. The variation of the instantaneous coefficient with time was observed to be very different from that predicted by the accepted model for the phenomena based upon unsteady state condition.