Abstract-Based on the conventional Euler bucking model and the effective nonlocal elasticity theory, the dynamic behaviors of cantilever and fixed-fixed nano-switches are studied in this paper. The governing equations for the dynamic response of the nano-switches including small-scale effect are derived by using the energy variational method. The small-scale effects on the stiffness of nano-switches are presented. It is found that the scale effect has softened the fixed-fixed nano-switches and hardened the cantilever nano-switches.Index Terms-Scale effect, cantilever nano-switch, fixed-fixed nano-switch, effective nonlocal elasticity.
The pressure drop predictions across a bypass pipeline in dense phase pneumatic conveying were investigated numerically. The simulation was conducted using the commercial Computational Fluid Dynamic (CFD) software Fluent with the Euler- Euler model accounting for four-way coupling. Experiments and calculations were conducted using flyash powder conveyed in a horizontal pipeline. The influence of the pipe length on pressure drop prediction was also investigated. The results indicate that pressure prediction of the CFD simulation model for a bypass pipe is promising. The conclusion is that this investigation can offer improved insight and initial design modelling capability for bypass pneumatic conveying systems.
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