An experimental study is performed to measure the terminal settling velocities of spherical particles in surfactant based shear thinning viscoelastic (VES) fluids. The measurements are made for particles settling in unbounded fluids and fluids between parallel walls. VES fluids over a wide range of rheological properties are prepared and rheologically characterized. The rheological characteriza...

The abundance of helium in the Sun's interior is estimated by the method of`model-oriented' helioseismic inversion of solar oscillation frequencies. In this method, the equations of state and thermal balance are used in addition to the hydrostatic equation. By inverting the observed p-mode frequencies, direct evidence for gravitational settling of helium has been obtained. However, the helium s...

A new adaptation scheme for low noise and fast settling phase locked loops (PLL’s) is presented. Extended loop bandwidth enhancement is achieved by the adaptive control on the reference frequency and frequency divide ratio. It enables the loop bandwidth in the speed-up mode to greatly exceed the limit of approximately 1/10 of the channel spacing in the integer frequency synthesizer. Based on th...

The problem of contact deformation an elastic body loaded by gravitational forces and laying on several small rigid supports is considered in the framework linear theory elasticity. Using method matched asymptotic expansions, limit model for determining support reactions kinematic parameters settling derived. effect surface reinforcement discussed. case a uniform (symmetric) detail.

Accurate estimates for the fall speed of natural hydrometeors are vital if their evolution in clouds is to be understood quantitatively. In this study, laboratory measurements of the terminal velocity yt for a variety of ice particle models settling in viscous fluids, along with wind-tunnel and field measurements of ice particles settling in air, have been analyzed and compared to common method...

A mathematical method for calculation of the minimum cross-sectional area of a thickener is presented by obtaining minimum laboratory batch settling test data, a function, which is called settling function, is derived. This function is found to be in the form of a polynomial of third order. The settling function and mass flux relation are used for the design of thickener. The method predict...

We develop and investigate an advection–diffusion-settling model of deep-sea mining collector plumes, building on the analysis midwater plumes in Part 1. In case deposition plays a predominant role controlling mass sediment suspension, thus setting extent plume. first discuss competition between settling, which leads to deposition, vertical turbulent diffusion, stretches plume vertically reduce...

a r t i c l e i n f o Keywords: Marine snow Aggregates Biogeochemistry Density gradients Density interfaces Fluid dynamics Marine snow aggregates are often a dominant component of carbon flux and are sites of high bacterial activity; thus, small-scale changes in the settling behavior of marine snow can affect the vertical locations of carbon export and remineralization in the surface ocean. In ...

Pelagic and demersal juvenile Baltic cod Gadus morhua L. were collected on the slope and the top of Rønne bank in the Baltic Sea during 2 cruises in November and December 1998. The growth, age at settling and vertical migration pattern were studied by otolith microstructure analysis. The relationship between fish and otolith size were found to change at settling, with an increase of fish size i...

many studies have considered the effects of suspension properties on the dewatering process but fewhave focused on ore properties. thus, the present work studied the effects of ore properties (density,particle size, mineralogy) on the dewatering process based on lab and pilot experiments. a hydrocyclonewas used to prepare the required samples for the experiments. to study the effects of mineral...