The hydrodynamics and the breakup of single oscillating drops which are accelerating from rest through a continuous phase were studied. Specially purified chlorobenzene, 1,2-dichloroethane, and ethylbromide were used as the drop phase liquids and double distilled water was used as the continuous phase liquid. The motion of the drops was recorded on cine-film using shadow and schlieren optical systems and these films were analysed frame by frame. Data is presented for the variation with time of the velocity of fall, the frequency of oscillation and the eccentricity of nonbreaking drops and the changes in the structure of the wake behind these drops is described. A transition of the wake behind the accelerating drops from class I to the wake class of the terminal region was observed. The first formation of a class III attached wake was followed by the onset of the terminal oscillations of the drop. A mechanism is proposed for the sustaining of these oscillations. The mode of breakup of freely falling drops was investigated. Secondary drops were formed by a necking process of the liquid columna which were formed both at the rear and at the front of the primary drop. The occurrance and the sizes of the secondary drops are related to the size and the oscillations of the primary drop. Theoretical predictions are made of the onset of necking and of the rate of necking using respectively surface free energy considerations and a momentum balance on the liquid in the column.
| Identifer | oai:union.ndltd.org:bl.uk/oai:ethos.bl.uk:461363 |
| Date | January 1975 |
| Creators | Kalafatoglu, I. E. |
| Publisher | University of Strathclyde |
| Source Sets | Ethos UK |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
| Source | http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=21710 |
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