... friction drag heat transfer non-Newtonian flow viscosity shear turbulence viscoelasticity drag reduction heat transfer reduction rheological characteristics Giesekus model Polymer and dilute surfactant solutions have been found to reduce turbulent friction drag greatly ( 1 2 3 4...

... Newtonian fluid flow like water through the same coils in the turbulent drag reduction region. Drag reduction and heat transfer reduction increase with an increase in surfactant solution concentration and temperature in the measured concentration and temperature ranges. On the other hand, they decrease...

... flow instability finite volume methods stagnation flow flow separation laminar to turbulent transitions wakes shear turbulence friction drag reduction heat transfer pressure drop lenticular elliptical cylinder cross flow subcritical flow The objective of the present study...

... ° C and fluid velocities from 0.56 to 3.5 m ∕ s , thus straddling normal velocities of heat transfer liquids in pipes. The aim was to investigate the drag reduction and the heat transfer reduction behavior of the surfactant solution. The velocity increment was deliberately reduced...

... received June 18, 2003. Associate Editor: G. P. Peterson. 30 August 2002 18 June 2003 23 09 2003 surfactants drag reduction turbulence channel flow non-Newtonian flow non-Newtonian fluids cryogenics transmission electron microscopy Heat Transfer Microstructures Non...

... (Re ′ >2300) to require the effect of drag reduction. On the other hand, the modified Reynolds number should be limited in the laminar region (Re ′ <2300) in order to take advantage the heat transfer enhancement...

... in a two-dimensional channel by utilizing the characteristic of fluid was studied. As the networks of rod-like micelles in surfactant solution are responsible for suppressing the turbulence in drag-reducing flow, destruction of the structure of networks was considered to eliminate the drag reduction...