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首页> 外文学位 >Characterization of the effects of low power pulsed vibration energy on biofouling inhibition in water piping systems.
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Characterization of the effects of low power pulsed vibration energy on biofouling inhibition in water piping systems.

机译：表征低功率脉冲振动能量对水管道系统中生物污垢的抑制作用。

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摘要

Low power pulsed vibration energy inhibits biofouling in water piping systems. The precise inhibition mechanisms, however, are unknown. This research focused on low power pipe structural vibrations that inhibit biofouling in flowing water systems. First, the effects of the pulse energy were evaluated. Biofouling inhibition in clear plastic piping was analyzed as a function of the distance from a Pulsed Acoustic Device (PAD) using a novel light absorption technique to approximate biofouling mass. Vibration induced in the PVC pipe wall inhibited biofouling up to 50% out to a distance of 24-pipe diameters from the PAD. Biofouling inhibition decreased with distance from the PAD. Second, pipe wall acceleration power spectrum levels were measured at discrete longitudinal distances from the PAD and evaluated between 0 and 10,000 Hz. Biofouling rate inhibition was observed over approximately four-week durations, however, the experiments were not run long enough to evaluate any long-term effects on total fouling population. Results indicate a potential relationship between biofouling inhibition and bending wave acceleration power spectrum levels at 1 kHz and potentially no relationship at 2 kHz. When the pipe was vibrated at two specific frequencies with equivalent bending wave acceleration power spectrum levels, it was observed that biofouling inhibition occurred at the higher of these frequencies (14,350 Hz) and that it did not occur at the other (700 Hz).; Pipe wall vibration was shown to be a necessary condition for pulsed-induced inhibition; the presence of an acoustic wave in the fluid by itself does not appear to inhibit biofouling. The data suggest that pipe wall vibration at selected frequencies within the critical residence time inhibited the irreversible attachment of microbes causing the fouling.; Experimental data were not sufficient to reach conclusions regarding whether the broadband impulse from the PAD excites many pipe natural frequencies. Nevertheless, the data suggest that some of the excited modes might in turn excite some of the mechanisms that could transfer energy to microbes to break them free from reversible adhesive forces holding them tentatively to the pipe wall and push them away from the wall.
机译：低功率脉冲振动能抑制水管道系统中的生物污染。但是，确切的抑制机制尚不清楚。这项研究的重点是抑制流动水系统中生物污垢的低功率管道结构振动。首先，评估脉冲能量的影响。使用一种新颖的光吸收技术，对透明塑料管道中的生物污染抑制进行了分析，该抑制作用是与脉冲声学设备（PAD）距离的函数，以近似生物污染质量。 PVC管壁中引起的振动在距PAD的24管直径范围内最多可抑制50％的生物积垢。生物污染抑制作用随距PAD的距离而减小。其次，在距PAD的不连续纵向距离处测量管壁加速度功率谱水平，并在0到10,000 Hz之间进行评估。在大约四周的时间内观察到了生物结垢率的抑制，但是，实验进行的时间不足以评估对总结垢种群的任何长期影响。结果表明，生物污垢抑制与弯曲波加速功率谱水平在1 kHz之间存在潜在关系，而在2 kHz则可能没有关系。当管道在两个特定的频率上以等效的弯曲波加速功率谱水平振动时，观察到在两个频率中较高的频率（14,350 Hz）上发生了生物污染抑制，而在另一个频率（700 Hz）上则没有发生。事实证明，管壁振动是抑制脉冲产生的必要条件。流体本身中存在声波似乎并不抑制生物积垢。数据表明，在临界停留时间内，选定频率的管壁振动会抑制微生物的不可逆附着，从而导致结垢。实验数据不足以得出有关PAD的宽带脉冲是否激发许多管道固有频率的结论。然而，数据表明，某些激发模式可能反过来激发了一些机制，这些机制可以将能量传递给微生物，从而使它们摆脱可逆的粘附力，从而暂时将其固定在管壁上并将其推离壁。

著录项

  • 作者

    Arcano, Joseph Timothy, Jr.;

  • 作者单位

    University of Maryland College Park.;

  • 授予单位 University of Maryland College Park.;
  • 学科 Engineering Environmental.
  • 学位 Ph.D.
  • 年度 2002
  • 页码 206 p.
  • 总页数 206
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 环境污染及其防治;
  • 关键词

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