A Study on the Hydrodynamic Instability in Boiling Channels : 3rd Report, The Modes of Vibration in Multi-Channel System and the Reverse Flow
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概要
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In the first part of this paper, the modes of vibration in the system with n parallel boiling channels and one downcomer and their stability are investigated. In the second part, a reverse flow, in which water flows downward in one or more heated channels, as if they were downcomers, and its stability are investigated. As the result, the following facts are found. (1) There are n normal modes of vibration in the system with n parallel boiling channels. One of them is an in-phase mode of vibration in which all channels vibrate in the same phase, and the other n-1 modes are mutual vibrations between channels, in which the sum of variations of flow rates is zero so that the downcomer gives no contributions to them. (2) The in-phase mode of vibration is more difficult to generate, as the number of channels becomes larger. Then, the mutual vibrations between channels, in which if flow rates are increased in some channels the same flow rates are decreased in other channels, are predominant in the system with many parallel boiling channels. (3) An orifice or throttle in the downcomer does not give the system any effects to damp the mutual vibrations between channels. (4) Reverse flow can be generated in the system with parallel boiling channels. The larger the flow resistance in the downcomer, the larger subcooling, the larger the difference of heat power between the channels, and the larger the number of channels is, the more easily a reverse flow is generated.
- 一般社団法人日本機械学会の論文
著者
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Hayama Shinji
Faculty Of Engineering University Of Tokyo
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Hayama Shinji
Faculty Of Engineering Tokyo University
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