The Laplacian growth problem in the limit of zero surface tension is proved to be equivalent to finding a particular solution to the dispersionless Toda lattice hierarchy. The hierarchical times are harmonic moments of the growing domain. The Laplacian growth equation itself is the quasiclassical version of the string equation that selects the solution to the hierarchy. The Laplacian growth pro...

Catalytic thermolysis is considered to be an effective process for viscosity reduction, the conversion of high-molecular components oil (resins and asphaltenes) into light hydrocarbons, desulfurization hydrocarbons. In this paper, we conducted non-catalytic catalytic a heavy sample isolated from Ashalcha field (Tatarstan, Russia) at temperature 250 °C. Fullerene C60 nanoparticles were applied p...

Laser confocal microscopy is used to non-invasively investigate the steady and unsteady evolution of viscous microdroplets on solid substrates. Three characteristic dynamical regimes of spreading drops (viscous-capillary, viscous-inertia-capillary, and inertia-capillary) are studied using this non-invasive optical technique. It is shown that the dynamics of each regime depend on the Ohnesorge n...

ABSTRACT Two different sizes of aggregates glass microspheres were compared in suspension with silicone oils viscosities. The concentration the was kept constant and equal to 62 vv.%. rheological behavior suspensions evaluated by squeeze flow test, for two test speeds. For both particles size, when immersed less viscous oil, yield stress did not show a good correlation tests Meanwhile, more oil...

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The displacement of more viscous fluids by less in porous media provides not only an industrial application for enhanced oil recovery (EOR) from reservoirs, but also a fundamental study the phase transition phenomena fluids, combining fluid mechanics and thermodynamics. Recent studies have shown that coupling thermodynamic hydrodynamic instabilities results formation self-driven active signific...

In this paper we present a mathematical model for estimate the collapse time of a gas bubble in a vane of a oil gerotor pump. This amount of time cannot be greater of the total time spent by the pump for filling and then emptying out a vane in a single revolution, otherwise there is a loss of lubrication between internal and external gears. We assume that oil is incompressible and viscous, the ...

The creation of new technological equipment for the implementation of highly efficient methods for recovering viscous oil from deep oil-bearing beds is a challenging scientific and engineering objective. To this end, a series of theoretical and experimental studies for designing tubing with the application of the developed basaltand glass-fiber-based composite heatinsulating coatings has been c...

Non-aqueous phase change emulsions are very unknown and promising multifunctional fluids consisting of materials dispersed in carrier fluids, both being oily phases. The oil-in-oil allow the possibility using same medium for latent heat storage transport under more extreme pressure temperature conditions. In this paper, stable composed stearic acid with a melting point 68–71 °C silicone oil hav...

As a first step towards a new crack healing methodology for cyclic loading, this paper examines two promising crack-tip shielding mechanisms during fatigue of a microcapsule toughened epoxy. Artificial crack closure is achieved by injecting precatalyzed monomer into the crack plane to form a polymer wedge at the crack tip. The effect of wedge geometry is also considered, as dictated by crack lo...