MODIFIED LOG-WAKE LAWS FOR TURBULENT FLOW OF THE OUTER AND INNER REGIONS IN SMOOTH PIPES |
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| Authors: | LIU Ya-kun NI Han-gen |
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| Affiliation: | 1. College of Shipbuilding Engineering, Harbin Engineering University, Harbin 150001, China;2. Department of Physics and Astronomy, George Mason University, Fairfax, VA 22030, USA;3. Offshore Oil Engineering Co., Ltd., Tianjin 300451, China;1. Department of Pharmacology, Faculty of Medicine, University of Helsinki, Helsinki;2. Heart and Lung Center, Helsinki University Hospital, Helsinki;3. Department of Internal Medicine, Helsinki University Hospital, University of Helsinki, Helsinki;4. Department of Internal Medicine, South Karelia Central Hospital, Lappeenranta, Finland;1. Department of Cardiovascular Surgery, Institute for Clinical and Experimental Medicine, Prague, Czech Republic;2. Department of Cardiovascular Surgery, Second Faculty of Medicine, Charles University, Prague, Czech Republic;3. Third Faculty of Medicine, Charles University, Prague, Czech Republic;4. Second Department of Surgery, Department of Cardiovascular Surgery, First Faculty of Medicine, Charles University, Prague, Czech Republic;5. Abbott Laboratories, Santa Clara, California, USA;6. Montefiore Medical Center, Albert Einstein College of Medicine, New York, New York, USA |
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| Abstract: | Based on theoretical analysis two modified log-wake laws for turbulent flow in smooth pipes are obtained, one is applicable to the outer region and other one to inner region, the new law for the outer region fits the velocity profile measured in smooth pipes by Zagarola very well and the effect of Reynolds number can be taken into consideration, the velocity profile for inner region satisfies the wall boundary conditions ,equals zero at the pipe wall and smoothly joins up with the velocity profile in outer region, the adopted eddy viscosity model is consistent with Laufer's, Nunner's and Reichardt's experimental data. |
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| Keywords: | turbulent pipe flow eddy viscosity log-wake law outer and inner regions |
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