“…A monotonic decrease in mass-transfer coefficient with increasing packing density is observed in the correlations proposed by Gawroski and Wrzesinska, [13] Li et al, [7] Costello et al, [20] Basu et al, [21] Thanedgunbaworn et al, [4] and Prasad and Sirkar. [23] On the contrary, the correlations presented by Asimakopoulou and Karabelas, [6] Kartohardjono and Chen, [8] Koo and Sangani, [10] and Zheng et al, [9] show an increase as the packing density increased. However, the predictions from the correlations of Johnson et al [18] and Yang and Cussler [25] are independent of the change in packing density while that of Wu and Chen [15] goes through a minimum with respect to packing density at about 0.55.…”