![]() We simulate the mixing (demixing) process of a quiescent binary liquid mixture with a composition-dependent viscosity which is instantaneously brought from the two- phase (one- phase) to the one- phase (two- phase) region of its phase diagram. ![]() Phase-field modeling of mixing/demixing of regular binary mixtures with a composition-dependent viscosity Thus, in this work the general aspects of phase and viscosity behaviour linked to the type of asymmetry found in refrigerant-lubricant mixtures are discussed in the context of phase. This also has a profound effect in the mixture transport properties. , mainly as a function of the molecular asymmetry. Phase and viscosity behaviour of refrigerant-lubricant mixturesĬisneros, Sergio Garcia, J. Lastly, for anhydrous conditions in which alpha quartz is stable, we find that there is a strong correlation between Vp/Vs and bulk viscosity in contrast, little to no correlation exists for hydrous conditions. In all cases, the viscosity calculated from the mixing model decreases less with depth compared to single- phase estimates. ![]() A mafic lower crust predicts viscosities that are an order of magnitude higher for the same geotherm. An andesitic lower crust results in viscosities of 1020-1021 Pa-s and 1021-1022 Pa-s for hotter and colder crustal geotherms, respectively. In all cases, the middle continental crust has a viscosity that is 2-3 orders of magnitude greater than that inferred for wet quartz, a common proxy for mid-crustal viscosities. To assess the role of crustal composition on viscosity, we examined two compositional gradients extending from an upper crust with ~67 wt% SiO2 to a lower crust that is either: (i) basaltic with ~53 wt% SiO2 (Rudnick and Gao, 2003), or (ii) andesitic with ~64% SiO2 (Hacker et al., 2011). Calculations are performed along geotherms appropriate for the Basin and Range, Tibetan Plateau, Colorado Plateau, and the San Andreas Fault. (2014) incorporating flow laws for each mineral phase. Effective viscosity is then calculated using the rheologic mixing model of Huet et al. We use Perple_X to calculate mineral assemblages for different crustal compositions. Here we follow a new approach for calculating the viscosity structure of the lower continental crust. The decomposition of the high pressure phase due to the slow decompression have shown very large hysteresis of viscosity on pressure dependenceĬrustal Viscosity Structure Estimated from Multi- Phase Mixing TheoryĮstimates of lower crustal viscosity are typically constrained by analyses of isostatic rebound, post seismic creep, and laboratory-derived flow laws for crustal rocks and minerals. The pressure exponents of the viscosity of both phases were different (the high-pressure phase had much smaller exponent). Further exponential rise of viscosity with pressure of the high-pressure phase of triolein. Extraordinary increment of viscosity at constant pressure during phase transition. Exponential rise of viscosity with pressure up to 0.5 GPa. For the measurement the authors have adopted a new ultrasonic method based on Bleustein-Gulyaev waves, successfully developed earlier for the low pressures in the Section of Acoustoelectronics of the Institute of Fundamental Technological Research. The high-pressure properties of triolein, a subject of extensive research at the Faculty of Physics of Warsaw University of Technology (WUT) have been enhanced by the results of viscosity measurement within the pressure range up to 0.8 GPa. Siegoczynski, R M Rostocki, A J Kielczynski, P Szalewski, M International Nuclear Information System (INIS) A viscosity measurement during the high pressure phase transition in triolein
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