scholarly journals Theoretical description of adiabatic laser alignment and mixed-field orientation: the need for a non-adiabatic model

2011 ◽  
Vol 13 (42) ◽  
pp. 18815 ◽  
Author(s):  
J. J. Omiste ◽  
M. Gärttner ◽  
P. Schmelcher ◽  
R. González-Férez ◽  
L. Holmegaard ◽  
...  
Keyword(s):  
Theoretical Description ◽  
Field Orientation ◽  
Laser Alignment ◽  
Mixed Field

scholarly journals Mixed-field orientation of molecules without rotational symmetry

2013 ◽  
Vol 139 (23) ◽  
pp. 234313 ◽  
Author(s):  
Jonas L. Hansen ◽  
Juan J. Omiste ◽  
Jens H. Nielsen ◽  
Dominik Pentlehner ◽  
Jochen Küpper ◽  
...  
Keyword(s):  
Rotational Symmetry ◽  
Field Orientation ◽  
Mixed Field ◽  
Orientation Of Molecules

Non-adiabatic effects in near-adiabatic mixed-field orientation and alignment

2016 ◽  
Vol 479 ◽  
pp. 63-71 ◽  
Author(s):  
Anjali Maan ◽  
Dharamvir Singh Ahlawat ◽  
Vinod Prasad
Keyword(s):  
Field Orientation ◽  
Mixed Field

scholarly journals Adiabatic Mixed-Field Orientation of Ground-State-Selected Carbonyl Sulfide Molecules

ChemPhysChem ◽  
2016 ◽  
Vol 17 (22) ◽  
pp. 3740-3746 ◽  
Author(s):  
Jens S. Kienitz ◽  
Sebastian Trippel ◽  
Terry Mullins ◽  
Karol Długołęcki ◽  
Rosario González-Férez ◽  
...  
Keyword(s):  
Ground State ◽  
Carbonyl Sulfide ◽  
Field Orientation ◽  
Mixed Field

Analysis of shear bands in slow granular flows using a frictional Cosserat model

2000 ◽  
Vol 627 ◽  
Author(s):  
Prabhu R. Nott ◽  
K. Kesava Rao ◽  
L. Srinivasa Mohan
Keyword(s):  
Scaling Laws ◽  
Shear Bands ◽  
Shear Layers ◽  
Theoretical Description ◽  
Field Variable ◽  
Cosserat Continuum ◽  
Momentum Balance ◽  
Rigid Plastic ◽  
Independent Field ◽  
Cosserat Model

ABSTRACTThe slow flow of granular materials is often marked by the existence of narrow shear layers, adjacent to large regions that suffer little or no deformation. This behaviour, in the regime where shear stress is generated primarily by the frictional interactions between grains, has so far eluded theoretical description. In this paper, we present a rigid-plastic frictional Cosserat model that captures thin shear layers by incorporating a microscopic length scale. We treat the granular medium as a Cosserat continuum, which allows the existence of localised couple stresses and, therefore, the possibility of an asymmetric stress tensor. In addition, the local rotation is an independent field variable and is not necessarily equal to the vorticity. The angular momentum balance, which is implicitly satisfied for a classical continuum, must now be solved in conjunction with the linear momentum balances. We extend the critical state model, used in soil plasticity, for a Cosserat continuum and obtain predictions for flow in plane and cylindrical Couette devices. The velocity profile predicted by our model is in qualitative agreement with available experimental data. In addition, our model can predict scaling laws for the shear layer thickness as a function of the Couette gap, which must be verified in future experiments. Most significantly, our model can determine the velocity field in viscometric flows, which classical plasticity-based model cannot.

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