F1-3 Recent movement of application study on the drag reduction in foreign countries
Details
Utilizing drag-reducing fluid -water added with surfactant, the pumping power in thermal energy transportation can be reduced significantly. In this paper, recent movement of application study to district heating/cooling system in northern European countries and USA is shown. Outlines of the field tests in each country are reported. A summary on development of surfactant, heat transfer improvement and fluid dynamical study are also given.
