The reductions in friction and heat transfer exhibited by a surfactant solution in the entry region of a circular pipe were measured and analyzed, with special attention paid to the relationship between the local heat transfer and friction. Two entrance configurations were used, a cone contraction and wire mesh plugs used as a device for velocity profile flattening. Both the simultaneous development of temperature and velocity profiles and the development of temperature profile with hydrodynamically predeveloped flow were studied. Interestingly, the local heat transfer measurements for surfactant solutions matched very well a correlation developed for polymer solutions, but for surfactants the development of the heat transfer and velocity profiles appear coupled, unlike what is thought to happen for polymer solutions. The development patterns appear to be independent of velocity and entrance type at low disturbance levels. At high disturbance levels, however, some striking changes in the fluid itself, likely due to temporary micellar structure degradation by high local shear stress in the inlet region, were observed as well, and quantified.
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Experimental Investigation of Thermal and Hydrodynamic Development Regions for Drag-Reducing Surfactant Solutions
K. Gasljevic,
K. Gasljevic
Department of Mechanical and Environmental Engineering, University of California, Santa Barbara, CA 93106
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E. F. Matthys
E. F. Matthys
Department of Mechanical and Environmental Engineering, University of California, Santa Barbara, CA 93106
Search for other works by this author on:
K. Gasljevic
Department of Mechanical and Environmental Engineering, University of California, Santa Barbara, CA 93106
E. F. Matthys
Department of Mechanical and Environmental Engineering, University of California, Santa Barbara, CA 93106
J. Heat Transfer. Feb 1997, 119(1): 80-88 (9 pages)
Published Online: February 1, 1997
Article history
Received:
April 24, 1996
Revised:
October 18, 1996
Online:
December 5, 2007
Citation
Gasljevic, K., and Matthys, E. F. (February 1, 1997). "Experimental Investigation of Thermal and Hydrodynamic Development Regions for Drag-Reducing Surfactant Solutions." ASME. J. Heat Transfer. February 1997; 119(1): 80–88. https://doi.org/10.1115/1.2824103
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