Abstract
This investigation deals with the effect of weir height, liquid and gas flow rate on tray efficiency.The tests were carried out on a single pass cross flow tray of air-water system of 0.3 m diameter for clearliquid height over sieve tray with weir height 3, 4 and 5 cm.Point efficiency values were found to be in the same range for different weir height, but itimproves slightly with weir height. And the average values of point efficiency were 83 % for 3 cm weirheight, 85 % for 4 cm weir height and 89 % for 5 cm weir height. While, point efficiency of 90 % was obtained for 5 cm weir height and liquid flow rate ranging between 5.8 to 7.32 m3/s. In the range of clear liquid height over hole diameter ( hL/dH) between 2 to 10, increasing the Reynolds number ranging between 2.0*105 to 1.6*106 for gas phase increases point efficiency. Prediction of Murphree (Tray) efficiency using Lopez and Castells (1999) equation shows that the ratio of EMV/Ep is equal to 1, due to low value of calculated Peclet number (degree of liquid mixing), which ranged between 0.07 to 1.5.
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