MODEL DEVELOPMENT FOR THE DESIGN OF BETTER MIST FILTERS

当纤维过滤器用于过滤时，它们表现出效率随时间而降低。 控制金属加工液雾。 这些效率的降低， 与过滤器内聚结的液体量有关，可能导致 工人暴露于潜在危险液滴的不可接受的增加。 研究人员已经开发出方程来预测效率和 当过滤器收集和保留液滴时，压力下降。 这些表达式可以 用于模拟湿过滤器性能，从过滤器是新的， 达到稳定的工作状态。 然而，这些方程并没有考虑到 过滤厚度或纤维材料对过滤性能的影响。 因为过滤器的厚度和纤维材料可能会影响液体的量 目前在过滤器，控制设备制造商需要了解的 这些因素对滤波器性能的影响，以设计更好的滤波器， 雾控制 本文的研究工作分为四个部分：（a）设计了一种改进的测试装置 用于测量定制测试过滤器的性能;（B）进行 实验来评估过滤器厚度和高度对过滤器的影响 性能; 进行实验以评估纤维材料的影响 （d）利用从实验中收集的数据， 修改用于预测湿过滤器性能的数值模型。 与 更新后的模型，设计一个过滤器，使效率降低最小化， 压降在过滤器的寿命期间增加。 当拟议的研究完成后，一个全面的数值模型， 湿过滤器的性能将提供给过滤器制造商 媒体和控制设备。 使用该模型，制造商将能够 设计过滤器，更有效地保护工人免受 潜在有害的金属加工液雾。 其他类型的过滤器， 使用改进的模型设计得更好，包括呼吸器过滤器，雾 化工厂中的消除器，以及用于防止 在核反应堆事故中释放出的放射性液滴。

Fibrous filters exhibit efficiency decreases with time when they are used to control metalworking fluid mists. These efficiency reductions, which are related to the amount of liquid coalesced within the filters, may lead to unacceptable increases in worker exposure to potentially hazardous droplets. Researchers have developed equations to predict changes in efficiency and pressure drop as filters collect and retain droplets. These expressions can be used to model wetted filter performance from when a filter is new until it reaches a steady operating condition. However, the equations do not account for the influence of filter thickness or fiber material on filter performance. Because filter thickness and fiber material may affect the amount of liquid present within filters, control equipment manufacturers need to understand the influence of these factors on filter performance to design better filters for mist control. The proposed research has four parts: (a) Design an improved test apparatus for measuring the performance of custom-made test filters; (b) Conduct experiments to evaluate the influence of filter thickness and height on filter performance; Conduct experiments to evaluate the influence of fiber material on filter performance; (d) Utilize the data collected from experiments to modify the numerical model used to predict wetted filter performance. With the updated model, design a filter that minimizes efficiency reductions and pressure drop increases over the life of the filter. When the proposed research is complete, a comprehensive numerical model of the performance of wetted filters will be available to manufacturers of filter media and control equipment. Using the model, manufacturers will be able to design filters that protect workers more effectively from exposure to potentially harmful metalworking fluid mists. Other types of filters that may be designed better using the improved model include respirator filters, mist eliminators in chemical plants, and high efficiency filters used to prevent the release of radioactive droplets in case of a nuclear reactor accident.