CASSON流体の管内流れについて

下限臨界レイノルズ数

抄録

It is the aim of this paper to provide a guide to the methacoal transportation design, that is to enable to determine the flow condition of the methacoal slurry of Casson characteristic fluids in pipes.
The application of the authors method using the stability parameter (i.e. Eq.(2)) for predicting the lower critical Reynolds number is extended to include the flow of Casson fluids in pipes and between parallel plates. The theoretical equations to estimate the lower critical Reynolds number for Casson fluids flow in pipes and between parallel plates are derived as Eqs.(12) and (23) respectively.
The reliability of the estimated values derived from these equations is not confirmed because at present no published loop test data which can be used to verify the theoretical results exist. These equations, however, seem to be suitable for predicting the lower critical Reynolds number of Casson fluids flow in pipes and between parallel plates, since a special case of Casson fluids (i. e. yeild stress τ_y=0) is a Newtonian fluid and the the theoretical results derived from the authors' method for Newtonian fluids and non-Newtonian fluids with/without the yield stress show good agreement with the experimental ones.