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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-421-2

International Heat Transfer Conference 15
August, 10-15, 2014, Kyoto, Japan

Drag Reduction of Thermally Stratified Flow in a Horizontal Pipe

Get access (open in a dialog) DOI: 10.1615/IHTC15.ttr.009892
pages 9189-9199

Resumo

The reduction of energy consumption for liquid transport has attracted a great deal of interest in recent years. Friction drag is closely related to turbulence and is a function of Reynolds number. In a stable, thermally stratified pipe flow, the buoyancy force caused by the temperature difference between the upper and lower layers suppresses heat transfer and turbulent mixing between the layers. The objective of the present study is to clarify the drag reduction phenomena of thermal stratification in a pipe flow. The stratification of pipe flow has been demonstrated to decrease the pressure drop by up to 22%. Furthermore, measurements performed under various Reynolds number conditions demonstrate that the drag reduction is effective in the range of 3000 < Re < 5000.