Abstract
Experiments on evaporation for lithium bromide aqueous solution (0–55 wt% LiBr) were made in Summary a externally heated wetted–wall column under reduced pressures. The evaporation rates of 5 and 8 wt% LiBr–water solutions were similar to those of water. The evaporation rates, however, owered with further increase of the concentration of LiBr, and at low feed rates the evaporation rates lowered with decrease of the feed rate because the temperature of the falling film rose. On the other hand, at high feed rates the evaporation rates lowered with increase of feed rates because the heat transfer coefficients of the falling film decreased. Therefore, a maximum evaporation rate existed and it was supposed that there is the optimum feed rate. The experimental data agreed with the values that were calculated numerically based on the unidirectional model that lithium bromide didn't move through falling film.
