5) minimum safety height 最小安全高度 1. The calculating formulas about the risers minimum safety height and the volume ratio of the surplus molten steel were derived by establishing the solidification mathematical model of a riser-casting system and using the Chvorinov law involving the ...
(32.2 feet per second per second), and h is the height of fluid held up over the orifice in feet of flowing fluid, i.e., the head. From this equation it is seen that as the flow rate changes, the head must also change. This change is proportional: The head required at maximum ...