Shahin Khosharay

14 Questions 30 Answers 0 Followers

Questions related from Shahin Khosharay

How is the interfacial tension of liquid-liquid system measured by pendant drop method?

It is known that the surface/interfacial tension tension can be measured by pendant drop method and the following equation: IFT=deltaro*g*de^2/H. 1/H is function of ds/de (1/H=f(ds/de)). I used...

06 February 2018 1,633 12 View

How does interaction between the hydrophobic tail of a foaming surfactant and an additive affect foaming?

Based on the previous investigations, the interaction between hydrophobic tail of a foaming surfactant like CTAB and additive like ethanol is stronger than the one between the hydrophobic tail and...

30 August 2017 1,633 3 View

Does the large area/molecule of a surfactant at the liquid-air interface decrease foaming of a surfactant solution?

The area/molecule of a surfactant is an important factor. What is the effect of this parameter on foaming?

30 August 2017 1,569 3 View

Does any experimental phase equilibrium data exist for (DMSO+alcohol) systems?

I need experimental phase equilibrium data exist for (DMSO+alcohol) systems, containing (methanol+DMSO), (ethanol+DMSO), (propanol+DMSO), (butanol+DMSO) and (hexanol+DMSO). Do we have any...

23 April 2017 6,125 0 View

Is the PEG family (for example PEG 4000) a good anti foam? What about its usage in the presence a cationic or anionic surfactant?

One of the method which can be used as an anti foam is the synergism of PEG with an anionic or cationic surfactant. Can this synergism compete with silicon based anti foams?

09 January 2017 4,873 5 View

Can PEG 400 form micelle?

Is Polyethylene glycol 400 (PEG 400) really a non-ionic surfactant? When PEG 400 dissolved in water, is it only decrease the surface tension of water or it can also form micelle and it has a CMC...

09 August 2016 7,652 3 View

What is the problem with three phase flash calculation for water/pentane/Co2?

I write a three-phase flash calculation for water/pentane/Co2 which has three phases, including vapor, water-rich liquid, and hydrocarbon-rich phases, but this program works up to 12 bar. When the...

03 June 2016 2,796 6 View

Does any equation exist for describing the fugacity coefficient of surface phase at high pressures?

I search for equation for describing the fugacity coefficient of surface phase or interface because I believe that different equation is needed for surface phase or interface. I search for the...

28 March 2016 3,621 5 View

Which version of SAFT equation of state is suitable for immiscible liquid-liquid phase equilibrium?

I begin a modelling investigation for immiscible liquid-liquid phase equilibrium such as water-octane.I realize that CPA EOS is not accurate enough for these systems. Which version of SAFT...

28 March 2016 3,425 4 View

Can change in initial ratio of oil and gas affect the results of two phase flash calculations at constant pressure and temperature?

I have an oil sample with 10 components and a gas mixture. For both of them we know the composition. We also know the pressure and temperature. For my calculation, first, I consider a molar ratio...

20 July 2015 543 6 View

Can methyl-cyclopentane form hydrate without presence of a gas?

Methyl-cyclopentane+help gas forms SH. Can methyl-cyclopentane form hydrate without this help gas?

10 April 2015 3,603 2 View

Can you name a book in which the thermodynamic of interface a good introduction into the thermodynamics of interfaces exists?

I search for a book in which the thermodynamics of interfaces is well explained.

23 March 2015 4,824 14 View

Why does the interfacial tension of systems containing water/immiscible liquid (for example water/octane) increase by increasing the pressure?

The interfacial tension usually decreases by increasing pressure, but for water/immiscible liquid interfacial tension increases by increasing pressure.

20 March 2015 2,701 3 View

Does any model exist which can support the viscosity and thermal conductivity of fluids up to very high pressures?

It is known that many viscosity and thermal conductivity models are only applicable for atmospheric and saturation conditions. On the other hand, very high pressures (higher than 500 bar) is a...

01 January 1970 3,584 3 View