...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Physical chemistry chemical physics: PCCP >A study of the effectiveness and energy efficiency of ultrasonic emulsification
【24h】

A study of the effectiveness and energy efficiency of ultrasonic emulsification

机译：超声波乳化的有效性和能量效率研究

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Three essential experimental parameters in the ultrasonic emulsification process, namely sonication time, acoustic amplitude and processing volume, were individually investigated, theoretically and experimentally, and correlated to the emulsion droplet sizes produced. The results showed that with a decrease in droplet size, two kinetic regions can be separately correlated prior to reaching a steady state droplet size: a fast size reduction region and a steady state transition region. In the fast size reduction region, the power input and sonication time could be correlated to the volume-mean diameter by a power-law relationship, with separate power-law indices of -1.4 and -1.1, respectively. A proportional relationship was found between droplet size and processing volume. The effectiveness and energy efficiency of droplet size reduction was compared between ultrasound and high-pressure homogenisation (HPH) based on both the effective power delivered to the emulsion and the total electric power consumed. Sonication could produce emulsions across a broad range of sizes, while high-pressure homogenisation was able to produce emulsions at the smaller end of the range. For ultrasonication, the energy efficiency was higher at increased power inputs due to more effective droplet breakage at high ultrasound intensities. For HPH the consumed energy efficiency was improved by operating at higher pressures for fewer passes. At the laboratory scale, the ultrasound system required less electrical power than HPH to produce an emulsion of comparable droplet size. The energy efficiency of HPH is greatly improved at large scale, which may also be true for larger scale ultrasonic reactors.
机译：在理论上和实验中单独研究了超声波乳化过程中的三个基本实验参数，即超声乳化过程，声学时间，声学幅度和加工体积，并与产生的乳液液滴尺寸相关。结果表明，随着液滴尺寸的降低，在达到稳态液滴尺寸之前，可以分别相关两个动力学区域：快速尺寸减小区域和稳态过渡区域。在快速尺寸减小区域中，功率输入和超声处理时间可以通过幂律关系与体积平均直径相关，分别具有-1.4和-1.1的单独的功率法指数。在液滴尺寸和处理量之间发现了比例关系。基于输送到乳液的有效功率和消耗的总电力，比较了液滴尺寸减少的有效性和能量效率。超声处理可以在宽范围的尺寸上产生乳液，而高压均匀化能够在较小端的范围内产生乳液。对于超声波，由于高超声强度下的更有效的液滴断裂，功率输入的能量效率较高。对于HPH，通过在较高的通过的压力下操作来改善消耗的能效。在实验室规模，超声系统需要比HPH更少的电力，以产生可比液滴尺寸的乳液。 HPH的能量效率大大提高，大规模可能是较大尺度超声反应器的真实。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号