Study Of Wave Motions Research Articles

Influence of intermittent steam injection into saline water: a study of wave motions in saline water for optimizing similar hydrodynamics in direct contact condensation based milk sterilization process

The injection of steam into the water or saline involve intermittent wave structures that can affect the mass and heat transfer within fluid domain. It may be analogous to the processes prevailed in milk sterilization process as the boiling point of the saline water ∼100.50C is nearly the same as the milk. Steam was injected into the rectangular duct at varying gauge pressure of 0.5, 1.0 and 1.5 bars and the proximity sensors were used to determine the disturbances over the surface of the saline water, read as the amplitudes of the waves. The wavy profiles thus found as a result of intermittent injection of steam into the saline water included the longitudinal waves, reflected waves cross-channel transverse and the edge waves. The normalized wave provided the spatial locations for the interaction regions between the surface gravity waves with the longitudinally propagating waves. The longitudinal waves and reflected waves reveals the length scales at which the incident longitudinal waves have been dissipated. These waves have been dissipated 80-90% of their amplitudes due to viscous dissipation. Thus, the relation between their growth rate and injection time has been defined based on the observed results.

Analysis of propagation of weakly nonlinear waves in a two-layer fluid with free surface

The study of wave motions in stratified fluids is one of the main tasks of hydrodynamics, which is caused by both theoretical and practical needs. Analytical analysis of propagation of weakly nonlinear wave packets in a two-layer fluid of finite depth in the presence of a free surface is performed. As a result, evolution equations of wave packets on the interface and the free surface in the form of the second-order nonlinear differential Schrodinger-type equations were derived. The form of internal and surface waves depending on the ratio of layer densities and the wave number considering the surface tension was analyzed. As a result, the effects of taking into account the second approximation in modeling wave motions in the two-layer system, which leads to blunting or sharpening of the wave crests and troughs were revealed. The analytical results are confirmed by field observations.

Study of wave motions in fluid-saturated porous rocks

In this investigation, Biot’s theory was employed in the study of wave motions in fluid-saturated porous rocks. Consistent with the described experimental arrangement, Biot’s equations were solved using a Laplace transformation. The theory predicts two dilatational waves: a slightly dispersed fast wave propagating ahead of a heavily dispersed and attenuated slow wave. By comparing these results with experimental results, it becomes evident that the measured waves are in fact the fast waves. Subject Classification: [43]20.15, [43]20.40.

DYNAMIC INSTABILITY OF TWO-DIMENSIONAL NONDIVERGENT FLOW IN A BAROTROPIC ATMOSPHERE

Abstract In discussing wave motions along a strong jet of westerlies, we can no longer neglect the variation of west wind with latitude, and therefore must consider the possibility of having a phase velocity whose value is between the maximum and minimum west-wind velocities. The study of wave motions is thus extended from the very long and slowly moving or retrograding waves into the realm of ordinary waves and cyclone waves and it is found that, for nondivergent barotropic motion, the condition for the presence of neutral and amplified waves with a phase velocity whose value is between the maximum and minimum wind velocity in the belt is the existence of critical points where the absolute vorticity has an extreme value. If no such point exists, then all perturbations must be damped. When this condition is satisfied, both amplified (unstable) and neutral waves can be expected. The wave moving with a velocity equal to the current velocity at the critical point is neutral while those with a velocity less t...