ABSTRACT

This paper deals with the mathematical modelling of the electrostatic spraying process in an industrial electrostatic oiling machine (EOM) for steel strips. Measurements from an industrial EOM show that the thickness and inhomogeneity of the oil film on the strips frequently exceed specified tolerance limits whereby the reasons were previously unknown. A numerical model of the spraying process is developed in ANSYS Fluent, which serves as the basis for a root-cause analysis of the erroneous oil film thickness. In contrast to other works in this area, a droplet break-up model, which describes the break-up of the oil droplets due to the charge they carry, is included to get more accurate results. The model is validated based on measurement data from an industrial oiling machine. It is demonstrated that the model yields a better understanding of the spraying process and it is successfully used to improve the oiling process.

摘要

本文涉及钢带工业静电涂油机 (EOM) 中静电喷涂过程的数学建模。工业 EOM 的测量结果表明，钢带上油膜的厚度和不均匀性经常超过规定的公差限值，而原因以前是未知的。在 ANSYS Fluent 中开发了喷涂过程的数值模型，作为油膜厚度错误的根本原因分析的基础。与该领域的其他工作相比，包含了一个液滴破裂模型，该模型描述了油滴因其携带的电荷而破裂，以获得更准确的结果。该模型基于来自工业涂油机的测量数据进行验证。