Name: SpectraSim
Availability: InStock

Theory

A perforated tube loses the whole dynamic head of its jets (Elnady et al., 2010) (Cummings, 1984). Without grazing flow the discharge coefficient is $C_{D0}$ (Discharge coefficient C_D0), which gives $K_0$ .

The solver starts with $I = K_0/t$ .
With the grazing correction on, $K$ is re-evaluated at the end of the upwind start-up phase and checked during the final phase (Grazing correction).
Because the grazing discharge coefficient is never above $C_{D0}$ , the run's $K$ is never below $K_0$ .

The readout updates when the open-area ratio, hole diameter, thickness or a typed $C_{D0}$ changes.

Equations

K_0 = \frac{1}{(\sigma\,C_{D0})^2}

(1)

where	meaning	unit
$\sigma$	Open-area ratio	-
$C_{D0}$	No-grazing discharge coefficient	-

Readout

Shown with two decimals; "-" while $\sigma$ or $C_{D0}$ is missing or invalid.