Tank drainage velocity is the rate at which a liquid drains out of a tank or container, usually measured in gallons per minute (GPM) or liters per minute (LPM).
The formula for calculating tank drainage velocity is: V = (0.408 x Q) / A, where V is the drainage velocity in feet per second, Q is the flow rate in gallons per minute, and A is the cross-sectional area of the tank outlet in square feet.
The area of the tank outlet directly affects the velocity of the draining liquid. A larger area means a larger opening for the liquid to flow out of, resulting in a higher drainage velocity. Conversely, a smaller area will result in a lower drainage velocity.
The shape of the tank can also affect the drainage velocity. For example, a tank with a conical bottom will have a lower drainage velocity compared to a tank with a flat bottom, as the conical shape creates more resistance to the flow of liquid.
Aside from area and shape, other factors that can impact tank drainage velocity include the viscosity of the liquid, the height of the liquid in the tank, and the presence of any obstructions or blockages in the outlet. These factors should be taken into consideration when calculating and predicting the drainage velocity of a tank.