Question

In a sand mold, a sprue of height $h_2=200\ mm$ is to be provided for maintaining the molten metal flow rate of $10^6\ mm^3/s$. The height of liquid column above the point 2 is kept constant at $h_c=25\ mm$. The cross-sectional areas of the sprue at points 2 and 3 are $A_2$ and $A_3$, respectively. The points 1 and 3 are at the atmospheric pressure. Assuming the gauge pressure at point 2 to be zero as the limiting case to prevent aspiration effect, the ratio $\frac {A_3}{A_2}$ _____ . (Rounded off to 2 decimal places)

Answer 1

The answer is: 0.31 or 0.35 (approx.)