Molten metal is poured into the downsprue at a constant flow rate during the time it takes to fill the mold. At the end of pouring the sprue is filled and there is negligible metal in the pouring cup. The downsprue is 6.0 in long, its cross sectional area at the top = 0.8 in2, and at the base = 0.6 in2. The cross sectional area of the runner leading from the sprue also = 0.6 in^2, and it is 8.0 in long before leading into the mold cavity, whose volume = 65 in^3. The volume of the riser located along the runner near the mold cavity = 25 in^3. It takes a total of 3.0 sec to fill the entire mold (including cavity, riser, runner, and sprue. This is more than the theoretical time required, indicating a loss of velocity due to friction in the sprue and runner. Determine: a. The theoretical velocity and flow rate at the base of the downsprue assuming no friction and zero velocity in the pouring cup.
b. Total volume of the mold, including downsprue, runner, and riser.
c. Actual velocity and flow rate at the base of the sprue
d. Loss of head in the gating system due to friction.