The formation of orifice-generated vortex rings, at a Reynolds number of 5300 and for a tube-to-orifice diameter ratio of 2.0, is experimentally investigated for stroke-to-diameter ratios of 0.5(0.5)5.0. A sign
In the laboratory, vortex rings can be generated by the motion of a piston that pushes a column of fluid in a cylinder through an orifice or nozzle. In the literature it is possible to find theoretical, numerical and experimental studies that address this problem. Many of the early works ca...
High spatial resolution PIV measurements using film recording have yielded detailed instantaneous 2-D velocity fields of the formation of orifice generated vortex rings. The resultant high spatial resolution vorticity distributions enable the location and magnitude of regions of both primary and secondary ...
High spatial resolution PIV measurements using film recording have yielded detailed instantaneous 2-D velocity fields of the formation of orifice generated vortex rings. The resultant high spatial resolution vorticity distributions enable thelocation and magnitude of regions of both primary and secondary ...
Heavier than air, CO2-loaded negative buoyant vortex rings are generated at an orifice opening of variable diameter using a piston-cylinder apparatus and are ejected vertically upwards into ambient atmosphere. Ring formation is investigated using a non-invasive Background-Oriented Schlieren (BOS) ...
To evaluate the impact of vortex rings in trans-mitral left ventricular filling flows in a physiologically shaped, in-vitro model, we studied a precisely delivered pulsed flow through an orifice with the same dimensional characteristics as the mitral annulus, and with a fully opening bileaflet ...
A formula for calculating the translational velocity of a vortex ring, generated through an impulsive ejection of fluid from an orifice, is presented. Variation of the translational velocity as a function of the stroke ratio and the non-dimensional mean core radius is calculated. Application of ...
Most of the NLxx samples were single-crystal samples. Before BCP, the samples were weighed using an electronic balance, their thicknesses were measured using a micrometer, and they were photographed using a high-definition camera in the clean room to record the state before polishing. A self-...