Experimental and numerical analysis of droplet deformation in a complex flow generated by a rotor–stator device

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• 作者：Runi Ditlev Egholm ; Peter Fischer ; Kathleen Feigl ; Erich J. Windhab ; Robert Kipka ; Peter Szabo
• 关键词：Complex flow ; Drop deformation ; Emulsion ; Numerical analysis ; Product design ; Simulation
• 刊名：Chemical Engineering Science
• 出版年：2008
• 出版时间：July 2008
• 年：2008
• 卷：63
• 期：13
• 页码：3526-3536
• 全文大小：1197 K

文摘

The deformation behaviour of single drops suspended in a second immiscible liquid undergoing a complex laminar flow is analysed both experimentally and numerically. The flow is generated in a channel formed by two rotating concentric cylinders with teethed walls as a model for extruding flow. The transient drop deformation and position in the device is captured by a twin-camera system in which one camera captures the drop deformation and the other camera captures the position of the drop. Results from an experiment consist of the transient drop deformation and the particle track of the drop. In our data analysis we define a geometry-based apparent shear rate which we compare to time-averaged drop deformations. Results indicate that for small deformations the relation between the time-averaged drop deformation and time-averaged apparent shear rate can be described by Taylor's small deformation theory.