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The IUP Journal of Mechanical Engineering
A Comparison of TiCN + Al2O3 + TiN and TiAlN Coated Carbide Tools for Machining of Inconel 718
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The Interfacial Tension (IFT) of an immiscible binary system is the most important property in the process design of Liquid-Liquid Extraction (LLE) and also in numerous mass transfer operations. Recently, the extraction of omega 3 Poly Unsaturated Fatty Acids (PUFA) from fish oil with silver nitrate solution is a novel extraction process, and in this case of process design, there is a lack of details about physical properties of fish oil silver nitrate system. Fish oil Ethyl Ester (EE)-AgNO3 is a rare binary system which lacks information about IFT system details. This work thus explored the interfacial surface force variations with practical fish oil/solvent/silver nitrate mixtures using spinning drop tensiometer to explore the observed variation in the flow pattern. The IFT data is used to design the flow dynamics of the extraction process design at mini/micro scale flow reactors.

 
 

Interfacial Tension (IFT) is one of the most common properties used for the characterization of liquid-liquid interfaces. A special situation arises in cases where there is the interfacial reaction or interfacial mass transfer operations. The extraction of omega 3 Poly Unsaturated Fatty Acids (PUFA) from fish oil EE with silver nitrate solution has been attempted in slug flow mini-fluidic contactor. It is necessary to investigate the flow properties such IFT of the fish oil Ethyl Ester (EE)-silver nitrate solution for better process design of Liquid-Liquid Extraction (LLE) conditions. IFT between two immiscible liquids arises from the dissimilarity of the intermolecular forces between the molecules in the phases. Therefore, this property affects two-phase flow patterns at mini/micro scale. Furthermore, the components in the experimental fluids play a major role either in reduction or increase of IFT. The densities and viscosities of both the aqueous phase and the organic phase are of importance since the difference in density and viscosity between the phases affects the flow patterns in the mini-channel. As a consequence, there is a possibility to separate phase in the LLE processes. In the case of LLE processes, the low IFT of solvent system offers increased surface area in the extraction system. However, sometimes low IFT can make phase separation and affect the flow pattern. The mini-channel is produced by a minute processing technique and the dimension of the channel is less than several millimeters in diameter, and the influence of the surface tension generally increases. Therefore, it is important that the fluid properties such as the IFT and surface tension values are accurately known to realize the advantages of mini/microfluidic processing. For more than a century, a variety of techniques have been utilized to measure IFTs between immiscible fluid phases. In the previous studies, a spinning drop method has usually been used to measure the IFT of two immiscible liquids. It is important to observe that the addition of various concentrations of organic solvents had an effect on the IFT of fish oil EE-silver nitrate system. However, the addition of organic solvents on the fish oil EE-silver nitrate system in mini-fluidic contactor might change the flow transition from stratified flow to slug flow in the channel. Moreover, the limitations in evaluating the IFT using spinning drop tensiometer are commented in this work.

 
 

Interfacial Tension (IFT), Spinning drop tensiometry, Fish oil, Silver nitrate solution