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41.
The theoretical flow models of homogeneous and separated flow are applied to in-tube condensation to predict the pressure
drop characteristics of R134a. The homogeneous flow model is modified by ten different dynamic viscosity correlations and
various alternative correlations of total, frictional and momentum pressure drops to take account of the partial condensation
inside the tube. Numerical analyses were performed to determine the average and local homogeneous wall shear stresses and
friction factors by means of a CFD program. The equivalent Reynolds number model is modified by six different two-phase friction
factors to determine the total condensation pressure drop in the separated flow model. The refrigerant side total pressure
drops, frictional pressure drops, friction factors and wall shear stresses are determined within a ±30% error band. The importance
of using the alternative total, momentum and frictional pressure drop correlations for the homogeneous flow model is also
shown. 相似文献
42.
In this study, we determined the most appropriate Hamiltonian that is needed for the present calculations of energy levels
and B(E2) values of 128–138Ce nuclei which have a mass around A≅130 using the interacting boson model (IBM). Using the best-fitted values of parameters in the Hamiltonian of the IBM-2,
we have calculated energy levels and B(E2) values for a number of transitions in 128,130,132,134,136,138Ce. The results were compared with the previous experimental and theoretical (PTSM model) data and it was observed that they
are in good agreement. Also some predictions of this model have better accuracy than those of PTSM model. It has turned out
that the interacting boson approximation (IBA) is fairly reliable for calculating spectra in the entire set of 128,130,132,134,136,138Ce isotopes and the quality of the fits presented in this paper is acceptable.
相似文献
43.
Buldurun Kenan Turan Nevin Bursal Ercan Mantarcı Asim Turkan Fikret Taslimi Parham Gülçin İlhami 《Research on Chemical Intermediates》2020,46(1):283-297
Research on Chemical Intermediates - Considering the importance of metal complexes in the development of medical science, two different Schiff base Fe(II) and Co(II) metal complex compounds were... 相似文献
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Ramadan Chalil Oglou Dr. Turkan Gamze Ulusoy Ghobadi Dr. Franziska Simone Hegner Prof. José Ramón Galán-Mascarós Prof. Núria López Prof. Ekmel Ozbay Prof. Ferdi Karadas 《Angewandte Chemie (International ed. in English)》2023,62(44):e202312353
Electrocatalytic processes involving the oxygen evolution reaction (OER) present a kinetic bottleneck due to the existence of linear-scaling relationships, which bind the energies of the different intermediates in the mechanism limiting optimization. Here, we offer a way to break these scaling relationships and enhance the electrocatalytic activity of a Co−Fe Prussian blue modified electrode in OER by applying external stimuli. Improvements of ≈11 % and ≈57 % were achieved under magnetic field (0.2 T) and light irradiation (100 mW cm−2), respectively, when working at fixed overpotential, η=0.6 V at pH 7. The observed enhancements strongly tie in with the intermetallic charge transfer (IMCT) intensity between Fe and Co sites. Density Functional Theory simulations suggest that tuning the IMCT can lead to a change of the OER mechanism to an external stimuli-sensitive spin crossover-based pathway, which opens the way for switchable electrocatalytic devices. 相似文献