MODEL DEVELOPMENT FOR THE DESIGN OF BETTER MIST FILTERS

纤维过滤器在使用时，其效率随时间而降低 控制金属加工液雾。这些效率降低，这是 与过滤器内凝聚的液体的量有关，可能会导致 工人接触潜在危险飞沫的增加令人无法接受。 研究人员已经开发出方程来预测效率和 过滤器收集和保留液滴时的压力降。这些表达式可以 用于模拟从新过滤器到新过滤器的湿过滤器性能 达到稳定的运行状态。然而，这些方程式并没有考虑到 用于过滤器厚度或纤维材料对过滤器性能的影响。 因为过滤器厚度和纤维材料可能会影响液体的量 目前在过滤器内，控制设备制造商需要了解 这些因素对过滤器性能的影响以设计出更好的过滤器 雾控制。 本研究分为四个部分：(A)设计改进的测试装置 用于测量定制测试过滤器的性能；(B)进行 滤层厚度和高度对滤层影响的实验研究 性能；进行实验以评估纤维材料的影响 关于过滤器的性能；(D)利用实验收集的数据 修改用于预测湿式过滤器性能的数值模型。使用 在更新的模型中，设计了一种将效率降低降至最低的过滤器 在过滤器的使用寿命内，压降会增加。 当拟议的研究完成后，一个全面的数值模型 湿式过滤器的性能将向过滤器制造商提供 媒体和控制设备。使用该模型，制造商将能够 设计滤清器，更有效地保护工人免受接触 可能有害的金属加工液雾。其他类型的过滤器可以 使用改进的型号设计得更好，包括呼吸器过滤器，雾化 化工厂的除尘器，以及用于防止 发生核反应堆事故时放射性液滴的释放。

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.