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Instability
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In a flow competes the inertia, which causes the masses to move without the effect of the surrounding masses, and the viscosity, which causes the masses to drag the surrounding masses.
If the viscosity is large, the correlation between the masses and the conformation of a laminar flow dominates. If the viscosity is low, the inertia dominates and the masses move without coordinating with the surrounding areas leading to areas that even form units that can rotate and move independently corresponding to the whirlpools.
ID:(878, 0)
Different viscosities
Definition
Viscosity has a profound effect on the behavior of a fluid, as can be seen in the following three examples:
ID:(7068, 0)
Turbulence generated by a Cigarette
Image
A cigarette has a glowing tip that heats the air in its surroundings. Additionally, the expelled smoke allows us to visualize the movement of the air. The heating leads to an expansion of the air, resulting in a decrease in density and, consequently, generates a lift force. As a result, the smoke starts to rise in a laminar fashion, forming the typical lines that are seen.
During this process, the gas begins to cool down, losing lift force, and certain regions start ascending more slowly, obstructing the upward movement of the air. This obstruction creates turbulence, and the same regions that ascend slower begin to rotate, forming part of the vortices observed in that area.
ID:(1654, 0)
Instability
Description
In a flow competes the inertia, which causes the masses to move without the effect of the surrounding masses, and the viscosity, which causes the masses to drag the surrounding masses. If the viscosity is large, the correlation between the masses and the conformation of a laminar flow dominates. If the viscosity is low, the inertia dominates and the masses move without coordinating with the surrounding areas leading to areas that even form units that can rotate and move independently corresponding to the whirlpools.
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Examples
Viscosity has a profound effect on the behavior of a fluid, as can be seen in the following three examples:
(ID 7068)
A cigarette has a glowing tip that heats the air in its surroundings. Additionally, the expelled smoke allows us to visualize the movement of the air. The heating leads to an expansion of the air, resulting in a decrease in density and, consequently, generates a lift force. As a result, the smoke starts to rise in a laminar fashion, forming the typical lines that are seen.
During this process, the gas begins to cool down, losing lift force, and certain regions start ascending more slowly, obstructing the upward movement of the air. This obstruction creates turbulence, and the same regions that ascend slower begin to rotate, forming part of the vortices observed in that area.
(ID 1654)
ID:(878, 0)