Hydrodynamic effects on coalescence.

Dimiduk, Thomas G. ; Bourdon, Christopher Jay ; Grillet, Anne Mary ; Baer, Thomas A. ; de Boer, Maarten Pieter ; Loewenberg, Michael (Yale University, New Haven, CT) ; Gorby, Allen D. ; Brooks, Carlton, F.

Sandia National Laboratories

关键词: Dynamics Symmetry (Physics);    Droplets;    Hydrodynamics.;    Coalescence;    42 Engineering;   

DOI  :  10.2172/897639
RP-ID  :  SAND2006-6561
RP-ID  :  AC04-94AL85000
RP-ID  :  897639

美国|英语

来源: UNT Digital Library

【 摘 要 】

The goal of this project was to design, build and test novel diagnostics to probe the effect of hydrodynamic forces on coalescence dynamics. Our investigation focused on how a drop coalesces onto a flat surface which is analogous to two drops coalescing, but more amenable to precise experimental measurements. We designed and built a flow cell to create an axisymmetric compression flow which brings a drop onto a flat surface. A computer-controlled system manipulates the flow to steer the drop and maintain a symmetric flow. Particle image velocimetry was performed to confirm that the control system was delivering a well conditioned flow. To examine the dynamics of the coalescence, we implemented an interferometry capability to measure the drainage of the thin film between the drop and the surface during the coalescence process. A semi-automated analysis routine was developed which converts the dynamic interferogram series into drop shape evolution data.