The advantage, however, is that the meter should have the correct coefficient of discharge (Cd) with this methodology.

The coefficient of discharge curve shown next is for a fabricated welded generic design.

The filling patterns of various aluminum gating systems for sand casting recently were investigated by observing both water modeling and molten aluminum via a new video capturing technique, allowing each systems' coefficient of discharge to be measured.

Using the actual velocity, the velocity coefficient of discharge was calculated.

Table 2 presents the gate velocity and velocity coefficient of discharge.

The conventional coefficient of discharge (CdV), calculated via the ratio of measured to theoretical velocity, is influenced by the following parameters:

The ratio of filled area over the total cross-sectional area of the gate is called areal coefficient of discharge and is less than or equal to one.

Gate Distance from Sprite--In each system, the areal coefficient of discharge is greater for the second gate than the first (except Systems 3A and 5A, with CdA = 1), due to back pressure from filling the runner.