Dense beds of the suspension-feeding brittlestar Ophiothrix fragilis are common in European waters. Their potential importance in benthic±pelagic coupling has been highlighted, but little is known about the feeding dynamics of this species. Encounter-rate models provide a potential mechanism for the estimation of feeding rates on suspended material of varying sizes. This work investigates facto...

I would like to thank my graduation committee for their supervision, advice and support. I would also like to thank prof.dr.ir. L.C. van Rijn and dr.ir. J.C. Winterwerp for their valuable advices and dr.ir. M. van Koningsveld for providing the frame work of the model and for his comments and suggestions. Further I would like to thank my colleagues from the environmental department of Van Oord f...

The stability of stratified Rivlin-Ericksen fluid in porous medium in the presence of suspended particles and magnetic field has been investigated. Upon application of normal mode technique, the dispersion relation was obtained. The important results obtained in this paper include the instability of non-oscillatory modes and the stability of oscillatory modes. Also, it was found that the system...

using a magnetic property measurement system (mpms), we measure magnetic susceptibility continuously at frequencies from 0 to 1000 hz for three different superparamagnetic (sp) grain sizes of magnetite (5nm, 7 nm and 10 nm) suspended in hydrocarbons (ferrofluids). our results confirm non-zero values of frequency-dependent susceptibility in the fine tail of nano-sized grains and provide new empi...

We discuss the relative speeds DeltaV of inertial particles suspended in a highly turbulent gas when the Stokes number, a dimensionless measure of their inertia, is large. We identify a mechanism giving rise to the distribution P(DeltaV) approximately exp(-C|DeltaV|(4/3)) (for some constant C). Our conclusions are supported by numerical simulations, and by the analytical solution of a model equ...

We consider a system of a very large number of particles of very diierent sizes, suspended in a carrier uid. These particles move due to diiusion and superimposed transport processes, merge to form larger clusters, or fragment into smaller ones. In the present paper a mathematical model for such processes is derived, consisting of an innnite quasilinear reaction-diiusion system, coupled to the ...