Influence of process fluids properties on component surface convective heat emission

International Conference on Mechanical Engineering, Automation and Control Systems 2017

机械制造;无线电电子学;计算机科学

Ivanova, T.N.^1,2 ; Korshunov, A.I.^2 ; Zavialov, P.M.^3

Tchaikovsky Branch Perm, National Research Polytechnic Institute, Lenin St. 73, Tchaikovsky

617764, Russia^1

FGBUN Institute of Mechanics, Ural Branch of the Russian Academy of Sciences, Senior Research Scientist, T. Baramzinoy St. 34, Izhevsk

426000, Russia^2

Kalashnikov Izhevsk State Technical University, Studencheskaya St. 7, Izhevsk

426000, Russia^3

关键词: Cooling process;    Displacement path;    Functional correlation;    Homogeneous medium;    Hydrodynamic boundary layers;    Physical variables;    Thermal boundary layer;    Working process;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/327/2/022051/pdf
DOI  :  10.1088/1757-899X/327/2/022051

学科分类：计算机科学（综合）

来源: IOP

【 摘 要 】

When grinding with metal-working process fluid, a thin layer of inhibited liquid is formed between the component and the grinding wheel under the action of viscous forces. This can be defined as a hydrodynamic boundary layer or a thermal boundary layer. In this work, the thickness of the layers is studied depending on the viscosity of the fluid, inertia forces, velocity and pressure of the flow; also the causes of their occurrence are identified. It is established that under turbulent flow, the viscosity of the flow and the diffusion rate are much higher than in laminar flow, which also affects heat emission. Calculation of heat transfer in a single-phase chemically homogeneous medium of process liquids has shown that their properties, such as viscosity, thermal conductivity, density and heat capacity are of primary importance. The results of experimental studies of these characteristics are presented. When determining the heat transfer coefficient, functional correlations between the physical variables of the process fluid and the change in time and space have been established. As a result of the studies carried out to determine the heat transfer coefficient of a plate immersed in the process fluid, it is established that the intensification of the cooling process of the treated surface immersed in the coolant is more intense than with other methods of coolant supplying. An increase in the pulsation rate of the process liquid flow and the length of the flow displacement path leads to an increase in the heat transfer coefficient of the treated surface and a decrease in the temperature that arises during grinding.