The influence of return bends on the downstream pressure drop and condensation heat transfer in tubes
Name
HTL_TR_1971_075.pdf
Size
3.23 MB
Format
Adobe PDF
Checksum (MD5)
a522e63d11d3d7322f9abbff2e7795f7
Author(s)
Traviss, Donald P.
Rohsenow, Warren M.
Date Issued
1971
Publisher
Cambridge, Mass. : M.I.T. Heat Transfer Laboratory, [1971]
Series/Report no.
Technical report (Massachusetts Institute of Technology, Heat Transfer Laboratory) ; no. 75.
Abstract
The influence of return bends on the downstream pressure drop and heat transfer coefficient of condensing refrigerant R-12 was studied experimentally. Flow patterns in glass return bends of 1/2 to 1 in. radius and 0.315 in. I. D. were examined visually and photographically using a high frequency xenon light source. Local pressure drop and heat transfer measurements were made along a horizontal 14 1/2 ft. test section immediately following the return bend. The refrigerant mass flux ranged from 1.32 X 105 to 4.58 X 105 lbm/hr-ft 2, saturation temperature from 90 to 107*F, and return bend quality from 0.24 to 1.0. The pressure drop and heat transfer data were compared to previous data for condensation without return bends. Effects on the downstream pressure drop and heat transfer were found to be small, if not negligible.
Subjects
Heat -- Transmission.
Refrigerants.
Condensation.
Tubes -- Fluid dynamics.
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