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Modeling interfacial tension of (CH4+N2)+H2O and (N2+CO2)+H2O systems using linear gradient theory
Farshad Varaminian,Shahin Khosharay 한국화학공학회 2013 Korean Journal of Chemical Engineering Vol.30 No.3
The linear gradient theory (LGT) of fluid interfaces in combination with the cubic-plus-association equation of state (CPA EOS) is applied to determine the interfacial tensions of (CH4+N2)+H2O and (N2+CO2)+H2O ternary mixtures from 298-373 K and 10-300 bar. First, the pure component influence parameters of CH4, N2, CO2 and H2O are obtained. Then, temperature-dependent expressions of binary interaction coefficient for (CH4+H2O), (N2+H2O)and (CO2+H2O) are correlated. These empirical correlations of pure component influence parameters and binary interaction coefficients are applied for ternary mixtures. For (CH4+N2)+H2O and (N2+CO2)+H2O mixtures, the predictions show good agreement with experimental data (overall AAD~1.31%).
Maryam Karamoddin,Farshad Varaminian 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.21 No.1
The objective of this work is the investigation of tetrahydrofuran hydrate formation under atmosphericpressure in a static reactor without stirring. The growth rate of hydrate is mostly controlled by theconduction heat transfer phenomenon. An approximate method based on the improved quasi solutionwas utilized to estimate the interface position of THF hydrate layer around a planar probe. In saidmethod, the polynomial (order 2) and exponential assumptions were introduced as temperature profilefor solid and liquid phases in finite regions. A proper agreement was found between the results ofmentioned solution and experimental data with average deviation about 3.5%. Also the parametriccurves were presented to describe the effect of operating parameters on the interface motion betweenhydrate and liquid phases. The hydrate formation based on subcooling driving force is very effective tosolve the separation difficulty between hydrate crystals and solution in water desalination procedure.
Bahman ZareNezhad,Mona Mottahedin,Farshad Varaminian 한국화학공학회 2013 Korean Journal of Chemical Engineering Vol.30 No.12
The carbon dioxide gas hydrate formation kinetics at the onset of turbidity is experimentally and theoretically investigated. It is shown that the time-dependent heterogeneous nucleation and growth kinetics are simultaneously governing the hydrate formation process at the onset of turbidity. A new approach is also presented for determination of gas hydrate-liquid interfacial tension. The CO2 hydrate-liquid interfacial tension according to the suggested heterogeneous nucleation mechanism is found to be about 12.7 mJ/m2. The overall average absolute deviation between predicted and measured CO2 molar consumption is about 0.61%, indicating the excellent accuracy of the proposed model for studying the hydrate-based CO2 capture and sequestration processes over wide ranges of pressures and temperatures.
Hadi Poortalari,Javad karimi Sabet,Farshad Varaminian 한국화학공학회 2018 Korean Journal of Chemical Engineering Vol.35 No.5
A simple non-equilibrium modeling approach is proposed to simulate multicomponent distillation process in packed columns. The real behavior of the column is simply considered by the evaluation of interphase mass transfer rate based on the overall mass transfer coefficient. Two distinct methods are used to calculate this overall coefficient including the effective mass transfer coefficient method and the packing efficiency method. The modelling procedure consists of an iterative segment-wise algorithm implemented in a MATLAB home-code. For verification, the obtained composition profiles from a structured and a random packed column are compared with reported experimental data. Comparisons show that the packing efficiency-based model could acceptably predict the experimental profiles with an average relative deviation of 18% and 25% for structured and random packed columns, respectively. This confirms that our simple non-equilibrium approach is a reliable and robust model for the performance evaluation of packed columns.