Often, when new sensor or actuator hardware becomes available for use in a control system, it is desirable to retain the existing control system and apply the new control capabilities in a gradual fashion rather than decommissioning the entire existing system and replacing it with an altogether new control system. However, this requires that the existing controller remains in action, and the ne...

In this work, we optimise microfluidic converging/diverging geometries in order to produce constant strain-rates along the centreline of the flow, for performing studies under homogeneous extension. The design is examined for both two-dimensional and three-dimensional flows where the effects of aspect ratio and dimensionless contraction length are investigated. Initially, pressure driven flows ...

This work describes a microfluidic device that is capable of sorting liquid plugs and storing them into pockets without actuators (active valves). We programmed the deterministic fluid flow using burst-valves with different geometries.

This paper analyzes the effect of mixing on nucleation of protein crystals. The mixing of protein and precipitant was controlled by changing the flow rate in a plug-based microfluidic system. The nucleation rate inversely depended on the flow rate, and flow rate could be used to control nucleation. For example, at higher supersaturations, precipitation happened at low flow rates while large cry...

The transition from stratified to intermittent air-water two-phase flow was investigated experimentally, by visualization and pressure drop signals analyses, in a 30 mm ID pipe. flow’s onset found be mainly dependent on the liquid superficial velocity pipe diameter. Plug flow, Less Aerated Slug (LAS) or Highly (HAS) flows could obtained gas grounds. available models, compared experiments, not p...

A rigorous analytical justification is developed for a simplification that widely used in one-dimensional simulations of steady and unsteady flows pipes, namely treating the flow as 'plug flow' which cross-sectional variations axial velocity are neglected except consequential shear forces on pipe walls. The proof obtained without assuming nearly incompressible and, indeed, it found plug approxi...

Abstract State Machines can be used to specify arbitrary system behaviour. However, when writing executable specifications one often has to write additional statements which organise how, e.g., in which order, the rules are executed. This reduces the readability and comprehensibility of specifications and can introduce additional defects to them. We propose a new syntax construct for the specif...

This work shows the observed changes in sample permeability and fracture geometry that occur within a fractured piece of low permeability shale with different effective stress gradients applied to the plug sample. These observations were made using an in-situ micro-CT fluid flow imaging apparatus with a carbon fibre Hassler-type core holder. Changes within the preferential fluid flow path under...

Water alternating gas (WAG) technique is used in the petroleum industry to inject carbon dioxide (CO2) into underground formations either for sequestration or enhanced oil recovery (EOR) processes. CO2 injection causes reactions with formation brine or aquifer and produces carbonic acid, the acid dissolves calcite and changes flow behavior significantly. Modeling and investigating effects of CO...

Dynamic modeling and simulation of fixed bed adsorption process was carried out by explaining the behavior of breakthrough curve parameter. Adsorption of sulfur compound, present in road fuel, has posed a great challenge. A model of fixed bed adsorption of benzothiophene from fuel was formulated with non-ideal plug flow behavior and considered velocity variation along a column. The model was so...