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Title: A numerical study of the flow dynamics of graphene sheets based on continuum simulations
Author: Salussolia, Giulia
ISNI:       0000 0004 8508 1259
Awarding Body: Queen Mary University of London
Current Institution: Queen Mary, University of London
Date of Award: 2019
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In this thesis, two aspects of the flow dynamics of nanosheets suspensions and layered 2D materials are analysed using continuum models. First, a flow-induced peeling mechanism is studied, in which the fluid forces lift a flexible “flap” of nanomaterial from the surface of a layered particle suspended in a flow. A realistic hydrodynamic load, derived from CFD simulations, is used to calculate the shear rate required to trigger the peeling as a function of the geometrical and mechanical properties of the particle. The dependence of the load on the flap opening angle determines a transition in the relation between the shear rate and the adhesion energy. For intermediate values of the non-dimensional adhesion energy, the shear rate saturates to a drastically smaller value than those expected from a constant load assumption. Secondly, numerical simulations of deformable nanosheets in shear flow are performed using two different models for the fluid-structure interaction, namely a local-drag model and a line-integral model. The interplay between the hydrodynamic stress and the bending stiffness governs the dynamics of a sheet and, together with the initial configuration, determines the bending shape. In the case of two adjacent sheets, the hydrodynamic interaction dominates the dynamics and the bending shape cannot be predicted by only considering the mechanical properties of the sheet and the fluid. The initial configuration of the particles plays a crucial role in the dynamics of the system, and small differences lead to radically different evolutions. By imposing various initial conditions, peeling, scrolling and detachment-reattachment dynamics have been observed.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: School of Engineering and Materials Science