| 摘 要： | When Bingham fluid is in motion, plugged flow often occurs at places far from theboundary walls. As there is not a decisive formula of constitutive relation for plugged flow,in some problems the solutions obtained may be indefinite. In this paper, annular flow andpipe flow are discussed,and unique solution is obtained in each case by utilizing the analyticproperty of shear stress. The solutions are identical in form with the commonly usedformula for the pressure drop of mud flow in petroleum engineering.
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