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ISSN Online: 2377-424X

ISBN Print: 0-89116-299-2

International Heat Transfer Conference 7
September, 6-10, 1982, Munich, Germany

EFFECT OF WEISSENBERG NUMBER ON TURBULENT HEAT TRANSFER OF AQUEOUS POLYACRYLAMIDE SOLUTIONS

Get access (open in a dialog) DOI: 10.1615/IHTC7.1480
pages 63-68

要約

Simultaneous measurements of friction and heat transfer coefficients for drag-reducing polyacrylamide solutions flowing turbulently in circular pipes were conducted in two different modes: 1) a once-through system in which fluid degradaion was kept to a minimum and 2) a recirculating flow system in which the fluid was allowed to deqrade. In the analysis of the resulting friction and heat transfer data, the characteristic time of each test solution was calculated using the Powell-Eyring model so that both friction and heat transfer results could be expressed as functions of the Reynolds and Weissenberg numbers.
The critical Weissenberg number for heat transfer for aqueous polyacrylamide solutions is found to be of the order of 200-250, above which the turbulent heat transfer lies on the minimum heat transfer asymptotic line. For these same solutions, the critical Weissenberg number for friction is of the order of 5-10, above which the turbulent friction lies on the minimum friction asymptotic line.