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Enhanced drag in pipe turbulent flow by an aqueous electrolyte: An electroviscous effect |
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| Authors: | E Benard JJJ Chen AP Doherty PL Spedding |
| Institution: | 1. School of Mechanical and Aerospace Engineering, Queen’s University Belfast, Ashby Building, Stranmillis Road, Belfast BT9 5AH, United Kingdom;2. Department of Chemical Materials Engineering, University of Auckland, Symons Street, Auckland, New Zealand;3. School of Chemistry and Chemical Engineering, Queen’s University Belfast, Keir Building, Stranmillis Road, Belfast BT9 5AG, United Kingdom |
| Abstract: | Drag enhancement is reported for turbulent pipe flow of aqueous electrolyte solutions. No electroviscous effect was obtained with laminar flow. Nor was any unusual pressure drop observed for laminar or turbulent flow of non-electrolyte aqueous solutions such as sugar. An electroviscous theory was advanced that predicted the drag enhancement for a 1/1 electrolyte solution. The theory depended on consideration of Debye length. |
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