Abstract
In the present work, by using a paralelepipedic thermogravitational microcolumn, the temperature gradient influence on the stability of the flow was or has been examined, emphasizing mixtures with negative Soret coefficients. Experiments and numerical analysis were conducted for DCMIX2 Toulene-Methanol binary subsystem. This binary subsystem has a broad range of negative Soret values for low concentrations of Methanol which was analysed. Two different concentrations have been studied in order to confirm existence of temporal stability windows of those mixtures. Experiments were compared with numerical simulations conducted in open source software OpenFOAM, for both cases.
Highlights
Thermal diffusion phenomenon plays an important role in many technological and biological separation processes [1,2,3]
Thermodiffusion experiments are constructed in order to obtain Soret coefficients, which is linked with therrmodiffusion coefficients obtained by thermogravitational technique [1] and molecular diffusion coefficients obtained by pure diffusion experiments like those in Sliding Symmetric tubes, Open Ended Capillary tube or Taylor dispersion technique [4,5,6]
Its clearly shown that for mixture 1, that length of stability window was different for different temperature gradient applied, where higher temperature gradient resulted in longer stability window
Summary
Thermal diffusion phenomenon plays an important role in many technological and biological separation processes [1,2,3]. Liquid binary mixture is placed between two parallel closed walls maintained on different temperature levels. Due to this gradient, the Soret effect appears and horizontal separation is provoked. If the Soret coefficient of the mixture is positive for denser component, denser component goes to cold wall and less dense component migrates toward hot wall.
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