Technical Description of Vortex and Material flow within:
A vortex occurs when there is a net rotation of a fluid field about an axis. Vortices are created when a fluid tumbles over an uneven solid boundary, such as over rocks in a river, wind blowing over the top of a fence or curb, or over rocks or a trunk of a car going at highway speeds. This occurs because in a real viscous fluid, such as water or air, the flow gets stopped by contacting the solid surface while the fluid some distance above the surface continues to move. The velocity difference between the moving and stationary fluid for a given thickness of flow creates a rotating fluid velocity field where kinetic energy eventually gets dissipated into smaller and smaller vortices until the kinetic energy gets dissipated into heat. Generally speaking, if the contours of boundary moves away from the faster, main region of the fluid quickly enough, the fluid cannot follow the contours of the surface smoothly and the flow will separate intovortices.If there is enough energy to sustain a velocity field over the uneven boundary, a vortex can be sustained. If particles, such as dust, are carried by the fluid and are blown over the uneven boundaries, some of the right size and shape can get entrained in the vortex. This happens because of a competition between centrifugal body forces and surface
pressure forces interacting with the dust particles. By Newton's first law, a body in motion wants to stay in motion, so the larger particles will tend not to be captured by a vortex and continue moving past the vortex, or away from the center of the vortex. Smaller particles get entrapped in the Vortex because their larger surface to volume ratio makes them susceptible to drag and pressure forces that move them towards the center of the vortex. The pressure field in a vortex has higher pressure farther away from the center of rotation because the fluid molecules are forced to the outer regions due to the centrifugal forces driven by the rotational velocity field. The result is that the pressure field creates surface forces on particles to move towards the rotational axis at the center of the vortex.
A vortex occurs when there is a net rotation of a fluid field about an axis. Vortices are created when a fluid tumbles over an uneven solid boundary, such as over rocks in a river, wind blowing over the top of a fence or curb, or over rocks or a trunk of a car going at highway speeds. This occurs because in a real viscous fluid, such as water or air, the flow gets stopped by contacting the solid surface while the fluid some distance above the surface continues to move. The velocity difference between the moving and stationary fluid for a given thickness of flow creates a rotating fluid velocity field where kinetic energy eventually gets dissipated into smaller and smaller vortices until the kinetic energy gets dissipated into heat. Generally speaking, if the contours of boundary moves away from the faster, main region of the fluid quickly enough, the fluid cannot follow the contours of the surface smoothly and the flow will separate intovortices.If there is enough energy to sustain a velocity field over the uneven boundary, a vortex can be sustained. If particles, such as dust, are carried by the fluid and are blown over the uneven boundaries, some of the right size and shape can get entrained in the vortex. This happens because of a competition between centrifugal body forces and surface
pressure forces interacting with the dust particles. By Newton's first law, a body in motion wants to stay in motion, so the larger particles will tend not to be captured by a vortex and continue moving past the vortex, or away from the center of the vortex. Smaller particles get entrapped in the Vortex because their larger surface to volume ratio makes them susceptible to drag and pressure forces that move them towards the center of the vortex. The pressure field in a vortex has higher pressure farther away from the center of rotation because the fluid molecules are forced to the outer regions due to the centrifugal forces driven by the rotational velocity field. The result is that the pressure field creates surface forces on particles to move towards the rotational axis at the center of the vortex.
