No abstract

A united chemical thermodynamic model, that is, the COSMO-UNIFAC model, was first proposed to predict the phase equilibrium of multicomponent systems in which the UNIFAC model parameters are missing. This model combines the advantages of the UNIFAC model (accurate prediction) and the COSMO-based models (a priori prediction). The predicted vapor−liquid equilibrium results by the COSMO-UNIFAC model were compared with experimental data from the literature and this work, confirming that it can provide a moderate quantitative prediction even if the UNIFAC model parameters are missing.

The united chemical thermodynamic model, that is, COSMO-UNIFAC model was first extended to the systems containing ionic liquids (ILs). This model for ILs combines the respective advantages of COSMO-based (priori prediction) and UNIFAC (relatively accurate prediction) models. The comparison of the predicted values by COSMO-UNIFAC model with experimental data indicates that this model can provide a moderate quantitative prediction for the systems containing ILs when the UNIFAC model parameters are vacant.

No abstract

No abstract

No abstract

PurposeThe purpose of this paper is to apply the lattice Boltzmann method (LBM) to simulate mixed flow, which combines natural convection for temperature difference and forced convection for lid driven, in a two‐dimensional rectangular cavity over a wide range of aspect ratios (A), Rayleigh numbers (Ra) and Reynolds numbers (Re).Design/methodology/approachThe LBM is applied to simulate the mixed flow. A multi‐relaxation technique was used successfully. A scale order analysis helped the understanding and predicting the overall heat transfer.FindingsIn the considered lid driven cavity, the Richardson number emerges as a measure of relative importance of natural and forced convection modes on the heat transfer. An expression of the overall heat transfer depending on the cavity slender (A) is deduced. The validity of the obtained expression was checked in mixed convection under the condition of low Richardson number (Ri) and the limitation condition was deduced.Practical implicationsThis paper has implications for cooling system optimization and LBM technique development.Originality/valueThis paper presents a new cooling configuration, avoiding critical situation where the opposing effect induce weak heat transfer; and a stable and fast LBM approach allowing complex geometry treatment.

No abstract