Turbulence lost in transience

Article Abstract:

Many scientists have challenged the general assumption of turbulence, which is regarded as a permanent feature of many fluid flows, by claiming that shear turbulence has a limited lifetime. Reynolds number is used to measure the strength of nonlinearity in a flow relative to the smoothing effects of viscosity and the studies have indicated that at small Reynolds number the shear turbulence is always destined to return to laminar state provided one waits long enough.

United States, Usage, Shear flow

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Dilatant shear bands in solidifying metals

Article Abstract:

Partially solidified alloys have exhibited characteristics of cohesionless granular materials, including Reynolds' dilatancy and strain localization in dilatant shear bands, which is vital in defect formation during high pressure die casting of Al and Mg alloys. The analysis of these alloys has highlighted the potential to apply the principles and modeling approaches developed in granular mechanics to the field of solidification processing.

Viscosity, Alloys, Mechanical properties, Solidification

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Hydrodynamic turbulence cannot transport angular momentum effectively in astrophysical disks

Article Abstract:

A laboratory experiment was carried out to demonstrate that non-magnetic quasi-keplerian flows at Reynolds numbers up to millions are essentially steady. The results indirectly support the magnetorotational instability as the likely cause of turbulence even in cool disks by ruling out purely hydrodynamic turbulence.

California, Angular momentum, Hydraulic measurements, Hydraulic flow

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