In a sand mold, a sprue of height
h2=200 mm is to be provided for maintaining the molten metal flow rate of
106 mm3/s. The height of liquid column above the point 2 is kept constant at
hc=25 mm. The cross-sectional areas of the sprue at points 2 and 3 are
A2 and
A3, 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
A2A3 _____ . (Rounded off to 2 decimal places)
