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Preferential Solvation in Binary Solvent Mixtures
Published in Yizhak Marcus, Solvent Mixtures, 2002
An example of the use of NMR chemical shift measurements for the direct study of the preferential solvation in binary solvent mixtures was provided by Muller [47]. He used the 19F chemical shifts of the trifluoromethyl group in perfluorohexane + hexane mixtures at 25 to 55∘C, the lower temperature being just above the upper consolute temperature of this mixture. These shifts were interpreted in a manner implicitly related to the QLQC method, using (2/Z)ΔeAB/kBT of Eq. (4.16) as the fitting parameter and volume fractions rather than mole fractions for weighting the observed shifts. The self-interactions of both components were found to be preferred over the mutual interactions. The lattice parameter Zincreased from 7 to 9 with increasing temperatures but ΔeAB decreased although relatively less.
Fundamental Issues Related to Flow Boiling and Two-Phase Flow Patterns in Microchannels – Experimental Challenges and Opportunities
Published in Heat Transfer Engineering, 2019
The comparison of experimental data presented in [59] with prediction according to Eq. (14) for flow boiling of perfluorohexane in copper microchannel heat sink at static pressure of 0.15 MPa is shown in Figure 11. The channels of heat sink have the cross-section of 335 × 930 µm2. The local vapor quality was slightly varied in the experiments near 0.25 and the measured heat transfer coefficients are in reasonable agreement with calculations. Perfluorohexane is dielectric liquid (the main component of FC-72) and it can be used for electronic component cooling. This liquid has low latent heat of vaporization and known correlations for pool boiling heat transfer of the refrigerants cannot be applied. Therefore, the experimentally determined dependence of pool boiling heat transfer on heat flux from [60] was used in calculations to account nucleate boiling heat transfer.