AbatraetDynamic behavior of gas emboti in a quiescent liquid having the rheological properties of human or animal blood subject to pressure variations is studied. Consideration is given to step and sinusoidal changes in the system pressure. It is disclosed that in the study of dynamic behavior of gas emboli, a Newtonian model may be used to approximate the rheological behavior of human or anima...

In the present study, an unlooped pulating heat pipe has been considered with two liquid slugs and three neighboirng vapor plugs.The governing equations such as momentum, energy and mass equations are solved explicitly except the energy equation of liquid slugs.The aim of the present study is to calculate the entropy generation through the performance of a pulsating heat pipe. Additionally, the...

Objective: to investigate the efficiency of a device that generates pulsatile flow during constant-speed axial-flow pump operation for use in left ventricular assist devices. Materials and methods. The flow-generating device, hereinafter referred as «pulsator», consists variable hydraulic resistance made form hull. A tube elastic biocompatible material featuring an inner diameter 11 mm is insta...

GW Vir variables are the pulsating members in the spectroscopic class of the PG 1159 stars. In order to understand the characteristic differences between pulsating and non-pulsating PG1159 stars, we analyse FUSE spectra of eleven objects, of which six are pulsating, by means of state-of-the-art NLTE model atmospheres. The numerous metal lines in the FUV spectra of these stars allow a precise de...

In this study, one-dimensional detonations in ammonia/hydrogen-air mixtures are numerically investigated by solving the fully compressible Navier-Stokes equations with detailed chemistry. Pulsating instabilities single-mode observed during detonation wave propagation, accompanied periodic coupling and decoupling of lead shock reactive front. The ratio between driver pressure initial determines ...

Due to insufficient knowledge of the processes occurring in chambers pulsating combustion, as well lack mathematical dependencies that make it possible fully describe parameters such chambers, authors this article present a model for calculating pressure fluctuations function time. The resulting dependence is based on fact combustion fuel takes place according an isochoric cycle, whereas outflo...

In recent years, flexible pipes made of synthetic polymer materials are being rapidly introduced into practice. Pulsating currents important in driving water and other liquids main pipes. This paper examines the pulsating a viscous incompressible fluid an elastic pipe. The necessary hydrodynamic parameters will be determined by solving problem, such as distributions pressure, velocity, flow rat...

This paper deals with the stability of triangular Lagrangian points in the elliptical restricted three body problem, under the effect of radiation pressure stemming from the more massive primary on the infinitesimal. We adopted a set of rotating pulsating axes centered at the centre of mass of the two primaries Sun and Jupiter. We have exploited method of averaging used by Grebenikov, throughou...

Context. The hot subdwarf B star HS 0702+6043 is known as a large-amplitude, short-period p-mode pulsator of the EC 14026 type. Its atmospheric parameters place it at the common boundary between the empirical instability regions of the EC 14026 variables and the typically cooler long-period g-mode pulsators of the PG 1716 kind. Aims. We analyse and interpret the photometric variability of HS 07...