The field of hydrodynamics, specifically microfluidics, is currently undergoing rapid development, with significant progress being made in the creation new devices and technologies that outperform their macroscopic counterparts. Concurrently, determining parameters a non-Newtonian fluid becoming an important task many areas industry production, particularly oil industry. Both drilling fluids (needed to create wells) polymer-based displacers surfactants extract oil) have properties. This...

This paper presents a study of the influence various factors on heat transfer in microchannels associated with use velocity slip (including thermal creep) and temperature jump boundary conditions walls. These can affect both individually together, but their effect microchannel has still not been practically studied. An attempt to eliminate this lack was made paper. It shown that as length increases value flux density by about 40% average coefficient 50% compare no-slip conditions. Wherein,...

Flow regimes and mixing pattern in a T-type micromixer at high Reynolds numbers were studied by numerical solution of the Navier-Stokes equations micro-PIV micro-LIF experimental measurement. The number was varied from one to thousand. cross section channel 200 μm×400 μm its length 3000 μm. Five different flow identified: (i) stationary vortex-free (Re < 5); (ii) symmetric vortex with two horseshoe vortices (5 Re 150); (iii) asymmetric (150 240); (iv) nonstationary periodic (240 400); (v)...

Cavitation flow in a microchannel behind cylinder with smooth and textured surface is investigated using mathematical modeling methods. The has 72 triangular prisms on its surface. height of the prism, normal to bluff body, was 100 nm. Profiles velocity volume fraction vapor are constructed. monitoring pressure at five points both carried out, while inlet changed up 30 bars. It shown that there no restructuring vortex street symmetrical form quite high-pressure values channel for rough...

Numerical modeling and experimental investigation of hydrodynamic cavitation on a microcylinder located in microchannel were carried out. The Zwart–Gerber–Belamri model was employed to simulate processes, turbulence simulated using the LES model. Experimental studies performed by visualization with shooting frequency 960 Hz. Fluid pressure at channel inlet ranged from 2 30 bar. Time dependences pressure, velocity vapor volume fraction, as well their average values, obtained five points....

The paper presents the results of a systematic microfluidic study application nanosuspensions for enhanced oil recovery. For first time, approximately dozen prepared by dilution silica sols as displacement fluids were considered. concentration nanoparticles in suspensions varied from 0.125 to 2 wt%, and their size ranged 10 35 nm. Furthermore, under consideration differed compositions functional groups pH. effects concentration, nanoparticle size, fluid flow rate, viscosity displaced...

Flow patterns and mixing of liquids with different initial temperatures in T-shaped micromixers are numerically investigated on the Reynolds number range from 1 to 250. The temperature one media was set equal 20°C, while another varied 10°C 50°C; its effect flow structure studied. dependences efficiency pressure difference this mixer miscible fluids were obtained. It shown that presence a leads shift regimes two can be considered as self-similar pattern regard reduced number.

Flow patterns and mixing of liquids with different densities in T-shaped micromixers are numerically investigated at Reynolds number range from 1 to 250. The density ratio the media varies 2; its effect on flow structure is studied. dependences efficiency pressure difference this mixer obtained. It shown that has a considerable structure, especially before transition symmetric asymmetric pattern.

An experiment-calculated investigation of forced convection nanofluids based on Al 2 O 3 nanoparticles was carried out. The hydrodynamic description and a model homogeneous were used. assumes that the hydrodynamics heat transfer can be described by conventional Navier-Stokes equations with physical parameters corresponding to nanofluids. results showed this very well experimental data in some cases. However, other cases, there are discrepancies between experiment theory explained real...

The study of regimes ethanol and water mixing was carried out using numerical simulation, the dependence efficiency these fluids on Reynolds number defined.In course investigation, a significant effect differences in viscosities densities miscible flow two found.The distributions pressure, components concentration velocity micromixer were obtained.The pressure drop number, as well map determined.The nonlinear mixture thermophysical properties taken into account.It found that last one results...

In this paper, we present the results of a systematic numerical study flow and mixing modes fluids in micromixers various configurations, particular, an analysis passive micromixers, most widely used practice, as well main methods to intensify mixing. The advantages microstructure reactors can significantly reduce reaction times increase productivity compared traditional bulk reactors. Four different geometries including straight T-shaped microchannel, were considered. effect geometrical...

Abstract The dependence of thermal conductivity suspension on the concentration single-walled carbon nanotubes was investigated. Mass ranged from 0.05 to 0.5%. Sodium dodecyl sulfate used as a surfactant. enhancement 34.8% were achieved for coefficient suspensions at 0.5wt.% CNT.

The results of development and testing the experimental method for determining thermal conductivity coefficient nanofluids are presented in this work.The measuring coefficients water ethyleneglycol were carried out developed technique.The measures ethyleneglycol-based Al 2 O 3 CuO nanofluid at room temperature out.Satisfactory coincidence measured by authors article other was obtained.