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We use numerical modelling to study the flow patterns of an active nematicconfined in a cylindrical capillary, considering both planar and homeotropicboundary conditions. We find that active flow emerges not only along thecapillary axis but also within the plane of the capillary, where radialvortices are formed. If topological defects are imposed by the boundaryconditions, they act as local pumps driving the flow. At higher activity wedemonstrate escape of the active defects and flow into the third dimension,indicating the importance of dimensionality in active materials. We argue thatmeasuring the magnitude of the active flow as a function of the capillaryradius allows determination of a value for the activity coefficient.

Confined active nematic flow in cylindrical capillaries