On Lower Critical Reynolds Number of Non-Newtonian Fluid Flow

抄録

Based on stability criterion, many researchers are investigating the lower critical Reynolds number of non-Newtonian fluid flow in tubes. The authors estimate theoretically the lower critical Reynolds number of Newtonian fluid flow in concentric annuli and in parallel plates and non-Newtonian fluid flow in circular pipes by the use of the stability parameter. The theoretical results of the present investigation are compared with the theoretical results given by Hanks, Mishra and Ryan and the experimental results quoted from literature. It is found that the theoretical lower critical Reynolds number agrees well with the experimental results of non-Newtonian fluid flow in circular pipes and also agrees with the experimental results of Newtonian fluid flow in concentric annuli and in parallel plates within the errors of the experimental values.