Chin. Phys. Lett.  2004, Vol. 21 Issue (1): 114-116    DOI:
Original Articles |
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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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.


Keywords: 47.50.+d      83.50.Ha     
Published: 01 January 2004
PACS:  47.50.+d  
  83.50.Ha (Flow in channels)  
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https://cpl.iphy.ac.cn/       OR      https://cpl.iphy.ac.cn/Y2004/V21/I1/0114
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