7,933 research outputs found
Is the fish-hook effect in hydrocyclones a real phenomenon?
Although the fish-hook effect has been reported by many for a very long time, scientists and practitioners
alike share contradictory opinions about this phenomenon. While some believe that it is of physical origin,
others opine that it is the result of measurement errors. This article investigates the possibility that the
fish-hook effect could indeed be measurement error related. Since all the experimental errors are embedded
in the raw size distribution measurements, the paper first lays down the steps that lead to estimation of the
partition function and confidence bounds, which are seldom reported in hydrocyclone literature, from the
errors associated with the experimental size distribution measurements. Using several data sets generated
using a 100 mm diameter hydrocyclone operating under controlled dilute to dense regimes, careful analysis
of the partition functions following the developed methodology yields unambiguous evidence that the
fish-hook effect is a real physical phenomenon. An attempt is also made to reunite some of the major contradictory
views behind the existence of the fish-hook based on sound statistical arguments
Multi-impurity adsorption model for modeling crystal purity and shape evolution during crystallization processes in impure media
ACKNOWLEDGMENTS Financial support provided by the European Research Council Grant No. [280106-CrySys] is gratefully acknowledged.Peer reviewe
Parametric, Optimization-Based Study on the Feasibility of a Multisegment Antisolvent Crystallizer for in Situ Fines Removal and Matching of Target Size Distribution
Peer reviewedPostprin
Theoretical spectroscopic studies of the atomic transitions and lifetimes of low-lying states in Ti IV
The astrophysically important electric quadrupole (E2) and magnetic dipole
(M1) transitions for the low-lying states of triply ionized titanium (Ti IV)
are calculated very accurately using a state-of-art all-order many-body theory
called Coupled Cluster (CC) theory in the relativistic frame-work. Different
many-body correlations of the CC theory has been estimated by studying the core
and valence electron excitations to the unoccupied states. The calculated
excitation energies of different states are in very good agreement with the
measurements. Also we compare our calculated electric dipole (E1) transition
amplitudes of few transitions with recent many-body calculations by different
groups. We have also carried out the calculations for the lifetimes of the
low-lying states of Ti IV. A long lifetime is found for the first excited
3d state, which suggested that Ti IV may be one of the useful
candidates for many important studies. Most of the results reported here are
not available in the literature, to the best of our knowledge.Comment: 15 pages submitted to J. Phys.
Universality in Fluid Domain Coarsening: The case of vapor-liquid transition
Domain growth during the kinetics of phase separation is studied following
vapor-liquid transition in a single component Lennard-Jones fluid. Results are
analyzed after appropriately mapping the continuum snapshots obtained from
extensive molecular dynamics simulations to a simple cubic lattice. For near
critical quench interconnected domain morphology is observed. A brief period of
slow diffusive growth is followed by a linear viscous hydrodynamic growth that
lasts for an extended period of time. This result is in contradiction with
earlier inclusive reports of late time growth exponent 1/2 that questions the
uniqueness of the non-equilibrium universality for liquid-liquid and
vapor-liquid transitions.Comment: 6 pages, 5 figure
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