Turbulent drag reduction with surfactant additives-basic research and application to an air conditioning system
It is well known that a small amount of chemicals such as water-soluble polymers or surfactants dramatically suppresses turbulence when they are added to liquid ow at large Reynolds number. In the last two decades, the application of surfactants to heat transportation systems such as district heating and cooling systems has attracted much interest among researchers. It has been revealed that 70% of the pumping power used to drive hot water in primary pipelines or district heating systems was saved by adding only a few hundred ppm of surfactant into the circulating water. The technological achievement requires a new design strategy for pipeline networks and heat exchangers to handle the drag reducing liquid flow. In the case of a Newtonian uid such as water or air, the knowledge for designing uid systems has been accumulated and the accuracy of numerical prediction is sufficient. On the other hand, the design system for surfactant solutions is not mature because drag-reducing ow phenomena are much more complicated than for Newtonian ow, for example, the friction factor for a surfactant solution depends not only on Reynolds number but also pipe diameter. In order to provide a design strategy for heat transportation systems using surfactant additives, we are now carrying out both experimental and numerical studies for surfactant solutions. In this lecture, experimental and numerical studies on the turbulence structure in drag reducing flow will be introduced. The result of an application study relating to the air conditioning system will be also shown.
drag reduction surfactant turbulence PIV DNS
Y.Kawaguchi F.C.Li B.Yu J.J.Wei
Department of Mechanical Engineering, Faculty of Science and Technology, Tokyo University of Science School of Energy Science and Engineering, Harbin Institute of Technology, P.O.Box 453, Harbin 150001 Beijing Key Laboratory of Urban Oil and Gas Distribution Technology, China University of Petroleum ( State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an 71004
国际会议
The Fifth International Conference on Fluid Mechanics(第五届国际流体力学会议)
上海
英文
2007-08-15(万方平台首次上网日期,不代表论文的发表时间)