Results are given of measurements of the pressure, density, and temperature of a mixture of water with methyl alcohol (methanol) with a composition of 0.5 mass fraction in the subcritical, critical, and supercritical regions of state parameters. The measurements are performed by the piezometer method at constant volume. The isotherms and isochors of p,ρ-dependences are used to determine the regions of the twophase liquid-vapor state and single-phase gas state and to estimate the values of the critical parameters of the mixture.
Vortex dynamics and heat transfer in a viscous incompressible fluid flow past shallow and deep trenches on a plane wall are studied methodically within the framework of the multiblock approach to solution of steadystate Reynolds equations closed by the Menter and Spalart-Allmaras turbulence models and the energy equation.A detached flow of viscous fluid in the vicinity of a trench on a plane wall has drawn the attention of hydromechanicians [1]. Trenches as well as protrusions on a washed wall are of interest to them first of all from the point of view of the contribution of the mentioned elements of roughness to the total resistance of bodies of complex geometry. Simultaneously, thermal physicists consider trenches or grooves as elements of enhancement of heat-transfer processes in near-wall flows [2,3].In many respects, interest in investigation of vortex dynamics and heat transfer in flow past a trench on a plane wall is also predetermined by the fact that lunes are a three-dimensional analog of trenches. As is known (see, e.g., [4]), lune technologies are a very promising tool of heat and mass transfer enhancement with very low hydraulic losses for pumping of a heat-transfer agent. Therefore, in order to analyze the governing mechanism of self-generation of vortex structures in concavities, thorough measurements of the parameters of flow past spherical lunes and two-dimensional trenches with a generatrix that copies the shape of the lune in the middle cross section were conducted at the N. E ′ . Bauman Moscow Higher Technical School at the beginning of the 1990s [5]. We should also mention a series of experimental works performed at the Institute of Thermophysics of the Siberian Branch of the Russian Academy of Sciences [6] with an emphasis on the effect of a three-dimensional character of flow in trapezoidal short trenches.The genesis of numerical simulations of an incompressible viscous fluid flow past trenches, as well as of the whole computational fluid dynamics (CFD), is closely related to the progress made in computer technology, the development of methods of solution of the Navier-Stokes equations, and improvement of semiempirical models of turbulence. It should be emphasized that the problem under consideration ranks among the classical problems, and its numerical solution for a laminar flow is quite satisfactory and has long been known. Of course, problems still remain, which are related, first of all, to interpretation of unsteady flows past bodies. However, the calculations of turbulent detached flows always presented the greatest difficulties. In the 1970-80s, a two-parameter dissipative model of turbulence or the Launder-Spalding k-ε model was widely used to close the Reynolds equations [7]. In the standard highReynolds variant it was supplemented by near-wall functions, since it was inapplicable in the immediate vicinity of the wall. Within this approach, detached flows with a fixed detachment point in the neighborhood of a recess [8] and technological joint [9] were calculated; in the latter ca...
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.