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Measurement of temperature profiles in turbulent pipe flow of polymer and surfactant drag-reducing solutions
 

Summary: Measurement of temperature profiles in turbulent pipe flow
of polymer and surfactant drag-reducing solutions
K. Gasljevic, G. Aguilar, and E. F. Matthys
Department of Mechanical Engineering, University of California, Santa Barbara,
Santa Barbara, California 93106, USA
Received 19 May 2006; accepted 19 July 2007; published online 29 August 2007
A device was built to measure temperature profiles of turbulent pipe flows of various drag-reducing
fluids. It is easy to use and reliable. We measured temperature profiles over a range of conditions
leading to accurate measurements down to y+
10, for tests carried over Reynolds numbers Re
between 10 000 and 90 000. The effects of high heat fluxes and buoyancy, in particular, were
quantified to ascertain the parameter range for accurate measurements. Temperature profiles
measured for type-A polymer solution and for cationic surfactant solutions allowed us to see strong
similarity between velocity and temperature profiles for drag-reducing surfactant solutions. A
comparison between the slopes of the thermal and velocity buffer layers resulted in calculated
turbulent Prandtl numbers between 6 and 9 for those drag-reducing solutions. We also used this tool
to investigate drag reduction for a nonionic surfactant solution, which showed a significantly
different fan-type profile, and also for a type-B drag-reducing polymer solution Xanthan gum .
2007 American Institute of Physics. DOI: 10.1063/1.2770257
I. INTRODUCTION AND LITERATURE REVIEW

  

Source: Aguilar, Guillermo - Department of Mechanical Engineering, University of California at Riverside

 

Collections: Engineering