Anomalous temperature dependence of surface tension and capillary waves at liquid gallium

The temperature dependence of surface tension \gamma(T) at liquid gallium is studied theoretically and experimentally using light scattering from capillary waves. The theoretical model based on the Gibbs thermodynamics relates the temperature derivative of \gamma to the surface excess entropy -\Delta S. Although capillary waves contribute to the surface entropy with a positive sign the effect of dipole layer on \Delta S is negative. Experimental data collected at a free Ga surface in the temperature range from 30 to 160 C show that the temperature derivative of the tension changes sign near 100 C.Comment: 11 pages, 1 Postscript figure, submitted to J. Phys.

INFLUENCE OF SOFT SQUEEZING ON THE DEGREE OF AXIAL CHEMICAL HETEROGENEITY AT PRODUCTION OF CONTINUOUSLY CASTED SLUGS. Message 1. Analysis of existing methods of production realization and calculation of regimes of soft squeezing

The methods of influence on quality of uninterruptedlycasted slug from the point of  view of  the axial chemical heterogeneity depression are considered, at the same time high emphasis is placed on use of  soft squeezing method

CALCULATION OF GROWTH OF SKELETON DENDRITES AT ALLOYS SOLIDIFICATION USING THEORY OF FRACTALS

The possibility of determination of dendritic crystals configuration is shown, what in combination with complex of equations of unsteady-state heat conduction and convective diffusion makes universal physical-mathematical basis, allowing to forecast the development of time and area of complex processes

CRACK FORMATION PROCESSES IN BEARING ROLLERS OF THE MACHINES OF THE SLUGS CONTINUOUS CASTING

The thermostressed state and conditions of crack propagation, the length of which determines the extent of deficiency of the bearing rollers metal, are investigated in this article

ANALYSIS OF THERMO-STRESSED STATE OF TRUNNIONS OF MNLZ

The article contains materials, dedicated to theoretical investigations of thermostressed state of rolls of MNLZ with the purpose of estimation of their durability. The worked out methods enable to determine the roll durability (number of loading cyclic processes) depending on speed of the ingot stretchin

MECHANICAL CHARACTERISTICS OF INDUSTRIAL TYPES OF STEEL AT HARDENING OF INGOTS AND SLUGS

The analysis of possibility of the fire cracks arising is carried out on the basis of existing data on changing of mechanical characteristics of industrial steel grades at high temperatures (in the processes of hardening and cooling in ingots and slugs). It is determined that at casting of slugs at MNLZ the failure of uniformity of hard skin in the initial period of its formation is possible

THERMAL-PHYSICAL PROCESSES AT HEATING OF METAL IN ANNULAR FURNACES

In the article there are presented the materials, concerning the peculiarities of thermal-physical processes, occurring at heating of cylindrical slugs in circular furnaces. The methods of calculation of actual heat capacity and cubic density, enabling to receive more precise results in comparison to the known ones, are worked out

CONTROL OF THE PROCESS OF SCORCHING BY MEANS OF ITS MICROALLOYING AT CONTINUOUS CASTING. Message 2. Generalization of experimental results

The available experimental data are generalized with the purpose of determination of relation between speed of dendrite crystals growth and size of diffusion overcooling for different grades of steel

RESEARCH OF THERMO-GRAVITY CONVECTIVE PROCESSES IN LIQUID NUCLEUS AT HARDENING OF STEEL INGOTS

The results of theoretical description of the melt moving in liquid ingot and in two-phase zone on the basis of numerical solution of problem are given

PLASTICITY OF TUBE TYPES OF STEEL AT HIGH TEMPERATURES

More modem ways of description of metal plasticity with purpose of appraisal of ‘'plasticity resource'', which can be used at choice of cooling regimes in the process of continuous casting of tube types of steel are examine