|M.Sc Student||Ratner Kornblau Inna|
|Subject||Spreading of Organic Liquid on Aqueous Solutions|
|Department||Department of Chemical Engineering||Supervisor||Professor Emeritus Abraham Marmur|
The spreading of organic liquids on aqueous solutions is of a great importance in a large number of industrial, day-to-day, and research applications. The understanding of the nature of the behavior of this spreading is crucial in controlling these applications. Up till now most of the research was dealing with the spreading of liquids on a solid substrate, while the spreading of the liquids on a liquid substrate got significantly less attention. In addition, it must be pointed out that in most researches made in the field of the spreading of organic liquids on water, the focus was on the spreading of pure liquids and not on the spreading of solutions. The understanding of liquid-liquid system behavior requires qualitative and quantitative investigations of these systems.
First in the present work, an experimental setup was constructed with a simple visualization technique that enables a qualitative characterization of spreading phenomena in liquid-liquid systems. With this experimental setup, the equilibrium state of pure and saturated alcohols and alkanes, spreading on pure or saturated (with the spreading liquid) water, was observed. In addition, this experimental setup was used for the qualitative characterization of binary solutions of alcohols and alkanes of various concentrations.
In the following step of the experimental work, by using the same experimental setup as before, the quantitative characterization of organic liquids-water systems was observed. However, after a close examination it was concluded that due to the short duration of the kinetic process of the observed spreading liquids the sampling rate should be higher. For that purpose the experimental technique was upgraded by using a fast camera that can shoot up to two thousand pictures per second.
In the upgraded system a number of problems were viewed. As a result of these problems, the power in the kinetics power law, for lens-forming alkanes, could not be conclusively determined. As a solution to these problematic issues, and to enable a more accurate quantitative characterization, a shadowgraph was built on an optical table. The advantage of this optical system, the construction of which is one of the main results in this research, is that it allows visualizing of the kinetic spreading process in liquid -liquid systems, using a noninvasive and precise method.