- #1
Rishav Roy
- 4
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When we write the equation for expressing the dynamics of capillary filling, why don't we include the effects of pressure difference?
Capillary filling is the process by which a liquid is drawn into a narrow tube or capillary due to the combined effects of surface tension, adhesive and cohesive forces.
The dynamics of capillary filling are influenced by the properties of the liquid, such as surface tension and viscosity, as well as the geometry of the capillary, including its diameter and length.
Gravity plays a role in capillary filling by pulling the liquid downward, counteracting the upward capillary forces. This can lead to slower filling rates in longer, more vertical capillaries.
In general, larger capillary diameters result in faster filling rates due to a larger surface area available for the liquid to climb. However, there is an optimal diameter for maximum filling rate, as very large capillaries may experience a decrease in surface tension forces.
The contact angle, which is the angle at which the liquid meets the surface of the capillary, can significantly impact the dynamics of capillary filling. A smaller contact angle allows for stronger capillary forces and faster filling rates, while a larger contact angle can impede filling.