In fluid dynamics, a vortex is a region within a fluid where the flow is mostly a spinning motion about an imaginary axis, straight or curved. That motion pattern is called a vortical flow.
mixer is a simple device used commonly in laboratories to mix small vials of
consists of an electric motor with the drive shaft oriented vertically and
attached to a cupped rubber piece mounted slightly off-center. As the motor
runs the rubber piece oscillates rapidly in a circular motion. When a test tube
or other appropriate container is pressed into the rubber cup the motion is
transmitted to the liquid inside and a vortex is created. Most vortex mixers
have variable speed settings and can be set to run continuously, or to run only
when downward pressure is applied to the rubber piece.
Vortex mixers are quite
commonplace in bioscience laboratories. In cell culture and microbiology
laboratories they may be used to suspend cells. In a biochemical laboratory
they may be used to mix the reagents of an assay or to mix an experimental
sample and a dilutant.