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International Heat Transfer Conference 13
Graham de Vahl Davis (open in a new tab) School of Mechanical and Manufacturing Engineering, University of New South Wales, Kensington, NSW, Australia
Eddie Leonardi (open in a new tab) Computational Fluid Dynamics Research Laboratory, School of Mechanical and Manufacturing Engineering, The University of New South Wales, Sydney, Australia 2052

ISSN Online: 2377-424X

ISBN CD: 1-56700-226-9

ISBN Online: 1-56700-225-0

PRESSURE LOSSES AND HEAT TRANSFER FOR FLOW OF DRAG REDUCING SURFACTANT SOLUTIONS IN PIPES AND FITTINGS

page 8
DOI: 10.1615/IHTC13.p20.60
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Experiments have been carried out to investigate pressure losses and heat transfer for flow of water with micellar drag reducing additives in a straight, 16 mm I.D. circular pipe, 180° bend of a 16 mm I.D. circular pipe and a 15 mm I.D. fully-and half-opened conventional globe-valve. Three commercially available surfactants: Arquad S-50, СТАВ and CTAC were used in preparing test liquids in four different concentrations. In the isothermal part of the measurements, flow of all three cationactive surfactants through the straight pipe induced significant and similar drag reduction characteristics whereas in the local hydraulic resistances, different drag reduction characteristics were observed. In the non- isothermal runs, measurement of axial profiles of the wall temperature on the electrically heated pipe (constant heat flux conditions) enabled to determine local and mean values of the Nusselt number. For flow of pure water through arrangements of piping elements in which the local hydraulic resistances were subsequently placed in front of the heated tube inlet, no influence of the front elements upon the heat transfer was observed. Contrary to this, flow of water with micellar additives increases heat transfer significantly, especially in the entrance region of the straight pipe.

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