When searching for an , look for templates that reference the HEI (Heat Exchange Institute) standards for jet vacuum systems. These are the industry gold standard for empirical data and safety factors. Key Features to Look For:
A_n = m_m / (ρ_m * V_m)
: Ideally, the nozzle expands to the suction pressure ($P_s$). However, if $P_s < P_m^ $, the flow is fully expanded. For "Fixed" calculation, assume expansion to $P_s$.* Excel Formula: =B3 ejector design calculation xls fixed
) will lead to 'choking' or 'backflow' in fixed-nozzle designs." Efficiency ( When searching for an , look for templates
): Use established correlations like those from Al-Dessouky et al. which use constants (A through J) to relate pressures and expansion ratios. However, if $P_s < P_m^ $, the flow is fully expanded
) —the ratio of entrained vapor mass flow rate to motive steam mass flow rate—based on specific pressure ratios. Key Design Formulas