A theory was developedf or cavitation flow in a two-dimensional right-angled branch duct. In analysis, the wake model was used. As a numerical example, the shape of the cavity streamline originating from the branch corner, the length of the cavity and the cavity height (thickness) were obtained for the values of 0.5, 1.0 and 2.0, which was the width ratio of the main duct to the lateral duct. The length and thickness of the resulting cavity were determined as a function of the cavitation parameter and the velocity of the lateral stream to the mainstream. That is, the length and thickness of the cavity increased as the cavitation parameter and the velocity ratio decreased, and as a result, the flow width of the lateral duct decreased. The cavitation parameters on the condition of the supercavitation were increased as the velocity ratio decreased a, nd these parameters agreed well with experimental results of the author's previous paper.

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The Vickers V1044C Vane Pump Test has been widely applied to estimate the anti-wearp roperties of hydraulic fluids such as mineral oils and various fire-resistan ftluids.
This paper studies the applicability of these test methods regarding high-water content fluids (HWCF). A s a result of this work, it wasr evealedth at the test pressuref or high-waterc ontent fluidso f the present state of the art should be low, namely 10-20 bar. Therefore, the special feature of this test, in which it simulates, though not satisfactorily the actual function of fluid powere lements, is thus lost for usual high-water content fluids. This test was able to show, however, the effects of anti-wear additives. Therefore, the test procedure itself maybe used to estimate the effect as an anti-wear agent when a high-water content fluids is finally developed.

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