Abstract
Drag Reduction in the energy consumption for liquid transportation has attracted much interest in recent years. Previous study shows that the pressure drop in pipe decreases under the stratified condition. The objective of this study is to clarify the drag reduction phenomena of thermal stratification in pipe flow. It has been shown that the stratification of pipe flow decreases the pressure drop in 3000 < Re < 5000. Furthermore, several types of junctions are tested to promote the drag reduction by stratification.
