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Dual Role of Viscosity During Start-Up of a Maxwell Fluid in a
Pipe |
| REN Ling;ZHU Ke-Qin |
| Department of Engineering Mechanics, Tsinghua University, Beijing 100084 |
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| Cite this article: |
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REN Ling, ZHU Ke-Qin 2004 Chin. Phys. Lett. 21 114-116 |
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Abstract Based on the exact solution of start-up flow of Maxwell fluids in a long circular straight pipe, the effect of viscosity on the time of flow establishment is analysed. It is found that the viscosity of Maxwell fluids plays a dual role. A key parameter is the dimensionless relaxation time λ. For 0 < λ < 0.0432, the viscosity mainly plays the same role as in Newtonian fluids, and the time of flow establishment decreases with the increasing viscosity; for λ > 0.0432, the viscosity mainly plays a role of strengthening the oscillation, and the time of flow establishment increases with the incremental viscosity.
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| Keywords:
47.50.+d
83.50.Ha
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Published: 01 January 2004
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