Key Engineering Materials Vol. 685

Abstract: General idea of mathematical simulation is set. Equations that describe hydraulic power pulse machine operation are described. Restriction factors are identified; they are included in mathematical model simulation. Mathematical simulation results are shown for essential parts of machine. Results of hydraulic power pulse machine mathematical simulation are presented.

Abstract: A two-dimensional nonstationary model of calculation of heat transfer at viscous fluid droplet spreading over the heated substrate is presented. A process of the fixed droplet spreading over a simple geometry substrate has been calculated. A hydrodynamic picture of the process of spreading has been obtained. The influence of the parameters of the model on the nature of spreading has been studied. The temperature profiles at the droplet surface have been obtained. The setting time of the stationary mode has been evaluated.

Abstract: In this work, the thermal conductivity problem is solved for fourth layer plate at the heat flux action on one of surfaces. The interfaces between layers are assumed non ideal that leads to appearance of thermal resistances between layers. Additionally thermal resistances are inhomogeneous due to curved surfaces of materials. The existence of curved surfaces and porosity of layers are connected with the way of specimen manufacturing. Thermal conductivity coefficients of layers can by changed when their porosity changes. The problem is solved numerically. It was found that curved interfaces and thermal resistance affect process only at initial stage of the heating. Temperature gradients depend essentially on porosity and thickness of layers.

Abstract: The transition from water-in-oil to oil-in-water emulsion is generally very abrupt and it is characterized by a marked decrease in the effective viscosity. The mathematical model of the ascending bubble in the water phase comparatively to the oil phase is described in this paper. Numerical simulation has been performed on two petroleum compositions with different water cut using HYSYS software. More even distribution of gas evolution for multistage separation has been obtained with water cut of oil approximately 75%. These results allow saving of heavy hydrocarbons due to reducing of entrainment into off-gases.

Abstract: This article describes the signals classification method when signals recording by land-based Doppler radar from different sources. It also presents various systems attributes defined within the active perception theory, which can be used to describe the signals. The results of computational experiments are presented.

Abstract: This paper presents a three-dimensional direct boundary element approach for solving transient problems of linear anisotropic elasticity and viscoelasticity. In order to take advantage of the correspondence principle between viscoelasticity and elasticity the formulation is given in the Laplace domain. Anisotropic viscoelastic fundamental solutions are obtained using the correspondence principle and anisotropic elastic Green’s functions. The standard linear solid model is used to represent the mechanical behavior of viscoelastic material. Solution in time domain is calculated via numerical inversion by modified Durbin’s method. Numerical example is provided to validate the proposed boundary element formulation.

Abstract: Free convection on a vertical surface with Newtonian heating of the form proposed by Merkin (1994) in the fluid-filled porous medium is considered on the basis of the full equations of a viscous liquid. Using dimensional analysis a set of criteria that define the characteristics of flow and heat transfer was derived. Asymptotic analysis of the full equations allowed us to determine the region of applicability of the boundary layer approximation, which was used in the previous studies of this problem. Darcy parameter influence was studied; the composite numerical and analytical solution for stream function and temperature was derived.

Abstract: In the present paper, the solution of a finite one-dimensional column with Neumann and Dirichlet boundary conditions are deduced based on the theory of mixture. The solution is obtained in the Laplace domain and the time-step method is chosen to obtain the time domain solution. The material data of Massillion sandstone are used for calculations. The column response to the dynamic loading is examined in terms of displacement, pore water pressure, and pore air pressure.

Abstract: Numerical simulation of the motion of a viscous incompressible nonisothermal liquid in an open rectangular cavity with a glance of heterogeneity phase characteristics is performed. The hydrodynamic pattern of moving liquid has been obtained. Temperature profiles for solid and liquid phases have been received. The model parameters influence on the motion of the heat carrier and the distribution of temperatures in two phases have been studied.

Abstract: This article studies the stress and strain state of simulated microvolumes of compact bone tissue under uniaxial compression, having different orientation of collagen-mineral fibers, different porosity and mineral content. The purpose of the study is to work out recommendations on development of artificial mechanically compatible biomaterials for osteoimplants. It has been found out that it is necessary to take into account the effective mechanical parameters defining the distribution of the bone tissue stress and strain when making individual implants.