FACTORS THAT AFFECT GENERATION OF COOLANT MISTS

长期暴露在金属加工作业产生的冷却液雾中 与职业病有关。近年来，有证据表明 暴露在冷雾中与胃肠道癌症之间的联系 TRAIL导致了大幅降低这些产品的PEL的呼声 薄雾：从5.0到0.5毫克/立方米。要达到这些水平，有效的控制 是至关重要的。 目前，雾的控制是通过对雾进行通风来实现的- 生产过程中，然后收集通风空气中的雾气。 另一种控制方法，可能比通风更有效 而收集，就是从源头上减少这些雾气的产生。 减少雾的产生需要了解影响雾化的因素 这些雾的产生速度和大小分布。这项提议是为了 对影响生物多样性产生因素的基础性研究 冷却剂雾气。 这项研究将描述金属车削和金属磨削 操作会产生冷却剂雾。将进行以下实验： 雾的生成率和大小分布将被表征为 这两个过程都在一系列操作条件下进行。结果将是 通过表征过程的无量纲群进行分析 表面速度、工艺功率和冷却剂流量等特性， 以及粘度和表面张力等流体特性。 这项研究的结果将以公式的形式公布，这些公式预测 雾的产生速度和大小分布。这些方程式将表明 加工过程和冷却液的性质可能是什么 为了减少雾气的产生而进行了改动。它们也可能对我们有所帮助 用于流行病学研究的过去的雾气暴露的特征 没有进行暴露测量或测量不完整。

Exposure to coolant mists produced by metal machining operations has long been associated with occupational disease. In recent years, evidence linking exposure to coolant mists with cancers of the gastrointestinal tract have led to calls for a substantial lowering of the PEL for these mists: from 5.0 to 0.5 mg/m3. To achieve these levels, effective controls are crucial. At present, mist control is accomplished by ventilation of the mist- producing process, then collection of the mist from the ventilation air. Another control method, potentially even more effective than ventilation and collection, is to reduce the generation of these mists at the source. Reducing mist generation requires knowledge of the factors that affect the generation rate and size distribution of these mists. This proposal is for a fundamental investigation of factors that affect the generation of coolant mists. This research will characterize how metal turning and metal grinding operations generate coolant mists. Experiments will be conducted in which mist generation rates and size distributions will be characterized for both processes over a range of operating conditions. Results will be analyzed through dimensionless groups that characterize process characteristics such as surface velocity, process power, and coolant flow, and fluid characteristics such as viscosity and surface tension. The results of this research will be presented in equations that predict mist generation rate and size distribution. These equations will suggest how machining processes and the properties of coolant fluids might be altered to reduce mist generation. They may also be useful to help characterize past mist exposures for epidemiological studies where exposure measurements were not made or were incomplete.