Radiation-Induced Transformations of Iron(II) Formate

The solid-phase decomposition of the iron formate crystal hydrate Fe(HCOO)₂ · 2H₂O under exposure to ⁶⁰Co -rays or 3.5-MeV electrons was studied. It was found that the irradiation of this salt to absorbed doses of 0.1–2 MGy resulted in the radiolysis of water of crystallization and the HCOO^– anion and in the reduction or oxidation of the Fe²⁺ cation. The composition of the solid-phase (-Fe, -Fe, FeO, -Fe -Fe₂O₃, Fe₃O₄, and FeCO₃) and gaseous (H₂O, CO, CO₂, HCOOH, and CH₄) radiolysis products of the substance was determined.     

EHD flows at large electric Reynolds numbers

The motion of a medium consisting of neutral particles and charged particles of single sign is studied under the assumption that the electric Reynolds number (R_q=u/bE) is large. We calculate the freezingin integral and the Bernoulli and Cauchy-Lagrange integrals, study the fluid motion in a stream tube, and formulate the boundary layer problem.     

Tangential Slot Gas Film Cooling. Comparison of Calculation and Experiment

A method of calculating of the boundary layer in liquid rocket engine (LRE) nozzles, developed by the authors and based on a differential three-parameter turbulence model, is tested using the known experimental data for the boundary layer on a plate in zero-pressure-gradient flow with tangential gas injection. Over a wide range of both bulk flow and injected gas parameters and for variable slot geometry, the calculations for both integral and local flow and heat transfer characteristics satisfactorily agree with experiment. The study has made it possible to obtain the governing parameters which significantly affect the gas film effectiveness.     

Thermal convection in a cylindrical enclosure with intense internal heat generation in the presence of a longitudinal magnetic field

Steady convection in a gaseous medium with intense heat generation is considered without making use of the Boussinesq approximation. The effect on convection of the thermal boundary conditions at the walls of the enclosure is investigated, together with the influence of a longitudinal magnetic field which is effective when the medium is strongly heated and becomes electrically conducting.Translated from Izvestiya Rossiiskoi Akademii Nauk, Mekhanika Zhidkosti i Gaza, No.3, pp. 11–18, May–June, 1992.The authors are grateful to the participants in the G. A. Lyubimov seminar for discussing their work.     

Supersonic boundary layer on a plate. Comparison of calculation and experiment

For verifying the method of calculating the boundary layer in liquid rocket engine (LRE) nozzles developed by the authors on the basis of a differential three-parameter turbulence model, the boundary layer on a plate in a zero-gradient flow is calculated. Over a wide range of variation of the free-stream Mach number, the temperature factor, and the Reynolds number, based on the momentum thickness of the boundary layer, the calculation agrees satisfactorily with the known experimental data, with respect to both integral and local flow and heat transfer characteristics. Moscow. Translated from Izvestiya Rossiiskoi Akademii Nauk, Mekhanika Zhidkosti i Gaza, No. 6, pp. 64–78, November–December, 1998. The work received financial support from the Russian Foundation for Basic Research (project No.96-012-00260).     

Tangential Slot Film Cooling in a Nozzle. Comparison of Calculation and Experiment

To test a method of calculating the boundary layer in liquid rocket engine (LRE) nozzles, developed by the authors and based on a differential three-parameter model of turbulence, nozzle flow with tangential-slot coolant injection in subsonic part of the nozzle is studied numerically. The effect of nozzle flow acceleration on the turbulence parameters and the dependence of the gas film effectiveness on the nozzle-inlet turbulence intensity are investigated. The numerical results are compared with available experimental data.     

Stability of Hydrocarbon Dispersions of Titanium, Zinc, and Calcium Oxides in an Electric Field

Hydrocarbon dispersions characterized by an aggregation and sedimentation stability in strong electric fields are obtained for titanium, zinc, and calcium oxides. To stabilize the suspensions, adsorption layers of 12-hydroxystearic acid, isotactic polypropylene, and barium di(2-ethylhexyl)dithiophosphate are consecutively applied. The observed stability of the dispersions is explained using the concepts of the concentration and hydrodynamic components of the polarization interaction between dispersed particles in an electric field.     

Perturbation method for solving the inverse vibrational problem in dependent coordinates

Solution of the inverse vibrational problem (IVP) when the dependent coordinates are excluded leads to a linear combination of the molecular force constants, of very limited usefulness for a series of related compounds. In this work we consider the question of separating these combinations during the solution of the IVP in a system of dependent coordinates. Such a solution is obtained by introducing a perturbation into the matrix of kinematic coefficients with the help of a certain self-consistent matrix. We obtain intrinsic force constants for tetrahedral hydrides (methane, silane, and germane) which reproduce experimental frequency spectra well.Three Hundredth Anniversary of the Reunion of the Ukraine with Russia State University, DnepropetrovskTranslated from Izvestiya Uchebnykh Zavedenii, Fizika, No. 8, pp. 26–30, August, 1987.