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| Force analysis of power-law fluid annular flow with the inner pipe in rotation and in orbital motion |
| Revised:May 24, 2006 |
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| DOI：10.7511/jslx20082041 |
| KeyWord:annular flow,orbital motion of inner pipe,power-law fluid,numerical simulation |
| FENG Shun-xin LI Qi-bing FU Song |
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| Abstract: |
| The fully developed laminar flow confined in an annulus was simulated numerically,when the inner pipe is rotating eccentrically with an orbital motion,and the flow is driven by axial pressure,and the fluid is in power-law type.The flow-induced forces on the inner pipe were analyzed.The results show that when the inner pipe is rotating eccentrically,the flow-induced forces on the inner pipe always have the effect of pushing the inner pipe to move along the same direction as its rotation.The inner pipe may have different motion states with force equilibrium depending on its linear density,when only a torque is imposed externally to drive its rotation: when the linear density is small enough,only in the concentric rotating situation can the inner pipe get force balance;when the linear density is large enough,the inner pipe can get force balance while rotating with orbital motion,and the orbital motion has constant eccentricity and speed.The greater the linear density is,the larger the eccentricity of the orbital motion is. |
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