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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Observations of acoustically generated cavitation bubbles within typical fluids applied to a scroll expander lubrication system
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Observations of acoustically generated cavitation bubbles within typical fluids applied to a scroll expander lubrication system

机译：应用于涡旋膨胀机润滑系统的典型流体中产生的空化气泡的声学观察

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摘要

An experimental study to evaluate the dynamic performance of three different types of cavitation bubbles is conducted. An ultrasonic transducer submerged into the working fluids of a scroll expander is utilised to produce cavitation bubbles and a high speed camera device is used to capture their behaviour. Three critical regions around the ultrasonic source, between the source and the solid boundary, and across the solid boundary were observed. Experimental results revealed that refrigerant bubbles sustain a continuous oscillatory movement, referenced as " wobbling effect", without regularly collapsing. Analytical results indicate the influence of several factors such as surface tension/viscosity ratio, Reynolds number and Weber number which interpret that particular behaviour of the refrigerant bubbles. Within the refrigerant environment the bubbles obtain large Reynolds numbers and low Weber numbers. In contrast, within the lubricant and the water environment Weber number is significantly higher and Reynolds number substantially lower. The bubble radius and velocity alterations are accurately calculated during the cavitation process. Lubricant bubbles achieve the highest jet velocity while refrigerant bubbles having the lowest jet velocity are not considered as a destructive mean of cavitation for scroll expander systems.
机译：进行了一项实验研究，以评估三种不同类型的空化气泡的动态性能。浸入涡旋膨胀机工作流体中的超声换能器用于产生气蚀气泡，并使用高速摄像装置捕获其行为。观察到超声源周围，源与固体边界之间以及跨越固体边界的三个关键区域。实验结果表明，制冷剂气泡可保持连续的振荡运动，称为“摆动效应”，而不会定期塌陷。分析结果表明几个因素的影响，例如表面张力/粘度比，雷诺数和韦伯数，这些因素解释了制冷剂气泡的特定行为。在制冷剂环境中，气泡获得大的雷诺数和低的韦伯数。相反，在润滑剂和水环境中，韦伯数显着较高，而雷诺数显着较低。在气蚀过程中，可以准确计算气泡半径和速度变化。润滑剂气泡达到最高喷射速度，而具有最低喷射速度的制冷剂气泡不被认为是涡旋膨胀机系统气蚀的破坏性手段。

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