Scaled flow rate Q∗=Qϕ0vbdcosθ as a function of D/(d cos θ) for different belt velocities and orifice sizes. The solid symbols are for an orifice width D = 6d = 6.6 cm, and the hollow symbols for D = 10d = 11 cm. All data points collapse together to form a master curve. The solid curve is a fitting line which follows an exponential function C′x(1–α e^–βx), where x=Ddcosθ , C′ = 0.95, α = 0.74, and β = 0.19.