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首页> 外文会议>NCA-vol.32; American Society of Mechanical Engineers(ASME) International Mechanical Engineering Congress and Exposition; 20051105-11; Orlando,FL(US) >ACOUSTIC CLOUD CONDENSATION NUCLEI COUNTER
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ACOUSTIC CLOUD CONDENSATION NUCLEI COUNTER

机译：声学云凝结核计数器

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摘要

Analysis and simulation of an acoustic cloud condensation nuclei counter is presented. The instrument is capable of accurately counting the number of micro scale water droplets impacting a water surface. The sound produced underwater by the water droplets is determined when the droplets strike the water surface with an impact velocity equal to either their terminal or maximum velocity. First, the terminal velocities of the droplets are calculated using Stoke's law and compared to measured velocities from Gunn and Kinzer. Then the maximum velocities that these droplets can sustain without breaking are calculated as a function of droplet diameter. Second, the sound due to droplet impact is estimated. Due to their size and water surface tension, there is no bubble formation at impact when the droplets are falling with terminal velocities. However conditions for regular bubble entrainments are established and limit velocities are calculated. Assuming that the micro water droplets can be accelerated, the maximum velocities for no bubble entrainments are calculated. The results show that the level of the sound produced by individual micro scale droplet falling with terminal velocity is so small that experimental verification is not possible. However, reasonable level of acoustic energy can be obtained by increasing the impact velocities of the droplets or by measuring the sound radiated by a group of impacting droplets. Finally, the droplets counting process is simulated using a water surface of one centimeter squared and a vertical growth chamber.
机译：给出了声云凝结核子计数器的分析与仿真。该仪器能够准确计算撞击水面的微水滴的数量。当水滴以等于其最终速度或最大速度的撞击速度撞击水面时，确定水滴在水下产生的声音。首先，使用斯托克定律计算液滴的最终速度，并将其与来自Gunn和Kinzer的测得的速度进行比较。然后，将这些液滴可以维持而不破裂的最大速度计算为液滴直径的函数。其次，估计由于液滴撞击而产生的声音。由于其大小和水表面张力，当液滴以最终速度下落时，在撞击时不会形成气泡。但是，建立了规则的气泡夹带条件并计算了极限速度。假设可以加速微水滴，则可以计算出没有气泡夹带的最大速度。结果表明，由单个微滴产生的声音随着终端速度的下降而减小，因此无法进行实验验证。然而，可以通过增加液滴的撞击速度或通过测量一组撞击液滴所辐射的声音来获得合理水平的声能。最后，使用一平方厘米的水表面和垂直的生长室模拟液滴计数过程。

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