Poiseuille流れにおけるアルミニウム粉末を含むタービン油の電気粘性効果(流体工学,流体機械)

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There were two ways to treat electrovisicous effects in the recent papers. Some papers treated them as increasing phenomena of apparent viscosity and the others treated them as those of Bingham fluid. So we investigated whether they were incompatible with each other. We had used the way to treat them as phenomena increasing apparent viscosity when we studied with Couette flow in our previous papers. But it became clear that the empirical formula of increase of apparent viscosity we deduced also suggested that the test fluid would behave as Bingham fluid under electric fields. Furthermore, it suggested that the yield stress of Bingham fluid would be in proportion to the stress acted on conductors in the test fluid by electric fields, and that the proportionality constants were influenced by volume concentrations and apparent dielectric constants of the suspension. To express the characteristics with Couette flow, the two ways mentioned above seemed to be compatible with each other. Next we calculated the velocity distributions and the flow rates with Poiseuille flow under electric fields as Bingham fluid. And we performed experiments with suspension of turbine-oil and aluminum powder to obtain velocity distributions and flow rates. The calculated results almost agreed with experimental values. So we concluded that the test fluid should be treated as Bingham fluid. And we could obtain the same characteristics of yield stress experimentally with Poiseuille flow as those deduced from the results with Couette flow mentioned above. We had tried to investigate the characteristics of suspension containing metal powders with high specific gravities experimentally with Couette flow, but we found it difficult because of precipitation of the metal powders. So we expect that it becomes possible to investigate those characteristics experimentally with Poiseuille flow.
一般社団法人日本機械学会の論文
2003-08-25

Poiseuille流れにおけるアルミニウム粉末を含むタービン油の電気粘性効果(流体工学,流体機械)

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