On pipe diameter effects in surfactant drag-reducing pipe flows |
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| Authors: | H Usui Takayasu Itoh Takashi Saeki |
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| Institution: | (1) Department of Chemical Science and Engineering Kobe University 1-1 Rokkodai, Nada-ku Kobe 657 Japan, JP;(2) Department of Applied Chemistry and Chemical Engineering Yamaguchi University 2557 Tokiwadai, Ube 755 Japan, JP |
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| Abstract: | Remarkable power saving in a fluid transport system is possible if the surfactant drag reduction technology is used. Application
of surfactant drag reduction to district heating and cooling systems has been investigated in the past. The establishment
of the scale-up law in drag-reducing pipe flows is one of the most important problems in this application. Main purpose of
this study is aimed to develop a reliable scale-up law in surfactant drag-reducing flows. As the basic data of surfactant
solutions, both non-Newtonian viscosity and viscoelasticity were experimentally determined. A turbulent eddy diffusivity model
based on the Maxwell model was employed to estimate the drag reduction of surfactant solutions. The predictions by the turbulence
model developed in this study with proper rheological characteristics of surfactant solutions has resulted in a reliable estimation
of the pipe diameter effect in surfactant drag-reducing flows over the pipe diameter range from 11 to 150mm.
Received: 30 June 1997 Accepted: 29 December 1997 |
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| Keywords: | Drag reduction surfactant micelles turbulence pipe diameter effect |
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