W/O乳化液分散相液滴破裂的临界条件

Critical Breakage Condition for Dispersed Droplets of W/O Emulsion

分析牛顿型液-液两相乳化液的分散相液滴的破裂机理及其临界条件,用Couette双圆筒装置形成薄层纯剪切流场,通过白油包水型乳化液滴在不同剪切率下的变形和破裂情况,验证临界破裂条件并加以修正。提出对于油水旋流分离器,根据实际的流场分布和乳化液的物性特点,可以预测分离效果;或根据分离器的分离能力,适当控制其转速或流量等操作条件,使内部流场合理分布,防止乳化液进一步乳化。为此,研究液滴的临界破裂条件可为各类油水乳化液分离设备内部的剪切分布的合理性提供可靠依据和优化指标。

The mechanism and critical breakage condition of dispersed droplets in Newtonian liquid-liquid emulsion was analysed. A lamina shear flow was obtained by Couette double-cylinder device. Based on the deformation and breakage of the water-in-oil emulsion at different shearing rates, the critical breakage condition was validated and updated. With respect to the water-oil hydrocyclone, the separate effect can be forecast by the flow distribution and the physical properties of the emulsion. According to the separate capability of the hydrocyclone, the operaing condition such as rotating speed and flux can be appropriately controlled to maintain a reasonable distribution of the internal flow field, therefore, to prevent a further emulsification. The study of the critical breakage condition can provide a reliable basis to determine the proper shear distribution in various emulsion separating devices.