水撃圧の負担について

概要

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In this paper, a clue for analysis of negative pressure in comparison with standard atmospheric pressure is discussed. In consequence of a much change of velocity of water in a pipe suddenly, the limitation of water hammer occures sometimes in negative pressure. Fluctuation of the pressure in that case amounts to the neighborhood of the absolute zero pressure, and it brings about a change of the propagation velocity of the water hammer wave. We suspected a change in the bulk modulus of whole water in the pipe as a result of this phenomenon, and introduced an asumption that evaporation of water was not negligible at extremely low pressure. Therefore, in the equation of continuity, the bulk modulus of the gas is considered, and through out the phenomena from normal to low pressure, a graphical method is made a trial by the characteristics curve.
山梨大学の論文