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首页> 外文会议>ASME(American Society of Mechanical Engineers) Pressure Vessels and Piping Conference 2006 vol.4 pt.B: Fluid-Structure Interaction >VIBRATION MECHANISMS OF A HEATED ROD DUE TO SUBCOOLED BOILING FLOW
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VIBRATION MECHANISMS OF A HEATED ROD DUE TO SUBCOOLED BOILING FLOW

机译：过冷沸腾流引起的加热杆振动机理

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Vibration characteristics of subcooled boiling flow on thin and long structures such as a heating rod were recently investigated by the authors. The results show that the intensity of the subcooled boiling-induced vibration (SBIV) was influenced strongly by the conditions of subcooling temperature, linear power density and flow velocity. Implosive bubble formation and collapse are the main nature of subcooled boiling, and their behavior are the only sources to originate SBIV. Therefore, in order to explain the phenomenon of SBIV, it is essential to obtain reliable information about bubble behavior in subcooled boiling conditions. This was investigated at different conditions of coolant subcooling temperatures of 25 to 75°C, coolant flow velocities of 16 to 53 cm/s, and linear power densities of 100 to 600 W/cm. High speed photography at 13,500 frames per second was performed at these conditions. The results show that even at the highest subcooling condition, the absolute majority of bubbles collapse very close to the surface after detaching from the heating surface. Based on these observations, a simple model of surface tension and momentum change is introduced to offer a rough quantitative estimate of the force exerted on the heating surface. The formation of a typical bubble in subcooled boiling is predicted to exert an excitation force in the order of 10~(-4) N.
机译：作者最近研究了细长的结构（如加热棒）上过冷沸腾流的振动特性。结果表明，过冷沸腾振动的强度（SBIV）受到过冷温度，线性功率密度和流速条件的强烈影响。爆炸性气泡的形成和破裂是过冷沸腾的主要性质，其行为是产生SBIV的唯一来源。因此，为了解释SBIV现象，必须获得有关过冷沸腾条件下气泡行为的可靠信息。在不同的冷却剂过冷温度为25至75°C，冷却剂流速为16至53 cm / s，线性功率密度为100至600 W / cm的条件下进行了研究。在这些条件下以每秒13,500帧的速度进行高速摄影。结果表明，即使在最高的过冷条件下，绝大部分气泡在从加热表面分离后也非常靠近表面坍塌。基于这些观察结果，引入了一个简单的表面张力和动量变化模型，可以对施加在加热面上的力进行粗略的定量估算。预计过冷沸腾中典型气泡的形成会施加10〜（-4）N量级的激发力。

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