Dr. Ireneusz Iwanowski
2021-(I)-A new evaluation Q-factor to be calculated for suction geometries as a basis for smooth suction in the operating field to ensure the highest possible blood integrity for re-transfusion systems
I. Iwanowski, J. Böckhaus , P. Richardt, I. Kutschka, G.G. Hanekop, M.G Friedrich: A new evaluation Q-factor to be calculated for suction geometries as a basis for smooth suction in the operating field to ensure the highest possible blood integrity for re-transfusion systems
Parameters which have been obtained from ultrasonic spectrometry, dynamic light scattering and shear viscosity are presented in Table (5.9). It is a fascinating aspect of the dynamic scaling theory of ultrasonic attenuation that, due to scaling of frequency data of different critical mixtures fall on one scaling function. However, the most curious speciﬁc system parameter is the characteristic relaxation rate amplitude Γ_0, which according to Bhattacharjee-Ferrell theory, corresponds with the mutual diffusion coefﬁcient D and the ﬂuctuation correlation length ξ. In Table (5.9) parameters Γ_0 and ξ_0 are listed for various binary mixtures with critical demixing point. The isobutoxyethanol-water system exhibits by far the smallest amplitude Γ_0 in the relaxation rate of order parameter ﬂuctuations. In comparison, with the system n-pentanol-nitromethane, Γ_0 is 35 times larger. Assuming, that the life time of ﬂuctuations τξ = Γ_0^−1, as inverse characteristic relaxation rate reﬂects intermolecular properties as well the geometry of considered components the strong variation of Γ_0 of various liquids can be understood. In addition, due to the Coulombic interactions, relaxation from a local nonequilibrium distribution of electrical charges into thermal equilibrium will involve extensive redistribution of ions in ionic solutions and may, therefore, proceed with a smaller relaxation rate than a molecular liquid mixture at the same reduced temperature. A quantity, which may be taken to summarize the above mentioned molecular properties, is the surface tension σ. If considering critical ﬂuctuations, reﬂected by the ﬂuctuation relaxation rate Γ_0 , to depend on the surface tension, a correlation between both quantities should exist.
The following project deals with the dynamic scaling aspects within the framework of Bhattacharjee-Ferrell theory. Furthermore, relationships between the critical sound attenuation and the dynamic scaling function are presented. Moreover, crossover effects for binary and ternary ﬂuids are presented.
Bhattacharjee-Ferrell scaling hypothesis - binary systems:
Critical phenomena, as all continuous phase transitions, Show universal characteristics of their thermodynamic properties, if they belong to the same universality class and if their dimension is identical. The concepts and consequences of critical slowing down have been presented in 2005-(II)-Critical Phenomena and Universality. In particular, the light scattering is well represented and described by dynamic scaling theories, resulting from the mode-coupling considerations. However, the treatment of critical ultrasonic attenuation necessitates the development of new theories in order to get an access to critical ﬂuctuations in a sound ﬁeld. Bhattacharjee and Ferrell have presented a general theory of the critical ultrasonic attenuation, based on an extension of the concept of the frequency-dependent speciﬁc heat. This conception was ﬁrstly introduced by Herzfeld and Rice in 1928.
J. K. Bhattacharjee, I. Iwanowski and U. Kaatze; Bulk viscosity universality and scaling function near the binary liquid consolute point;
J. Chem. Phys. 131 174502 (2009)
2009-(I)-Fluorescence Change Detection of Glycopolymers during Phathogen Binding via Waveguide Technology
I. Iwanowski, S. Z. Mirzaev, K. Orzechowski and U. Kaatze; Critical dynamics at the col point of the ternary system methanol-n-hexane-cyclohexane;
Journal of Molecular Liquids 145 2 103-108 (2009)
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