A new simplified tray efficiency model with improved accuracy for sieve trays

110th Anniversary: Column Efficiency: From Conception, through Complexity, to Simplicity

“…Our own calculations using the efficiency databases assembled by Chan 65 and Garcia 66 suggest that the O'Connell correlation has an average relative deviation of −17% and an average absolute deviation of 20%. (Many data points in this collection lie far outside the ±20% error band; see Duss and Taylor 67 ).…”

“…To estimate the section efficiencies from eqs3−5, 7, and 13, we need the number of transfer units and the flow path length correction constant that appears in eq 13. Duss and Taylor 67 developed the following model: Figure 2 shows the parity plot for data points having capacities below 98% and above 25%. It is in this range that liquid entrainment and weeping has no major impact on the measured section efficiency.…”

“…Duss and Taylor went on to develop an improved correlation for sieve trays. Their model is based on eqs – with a modified version of eq : Lewis did not include a correction for the flow path length, FPL.…”

“…To estimate the section efficiencies from eqs –, , and , we need the number of transfer units and the flow path length correction constant that appears in eq . Duss and Taylor developed the following model: The units used in eqs – are centipoise (cP) for the viscosities and millimeters (mm) for the hole diameter and the weir height; FOA, the fractional open area, is defined as the total hole area divided by the bubbling area. The flow path length is in meters (m).…”

“…Better, Simple Model. Duss and Taylor67 went on to develop an improved correlation for sieve trays. Their model is based on eqs3−7 with a modified version of eq 6:…”