00:00:01.010 in falling film evaporators long tubes 00:00:06.11000:00:06.120 of diameters from five centimeter to 25 00:00:10.66900:00:10.679 centimeter are used the liquid feed 00:00:14.95900:00:14.969 enters from the top and the liquid flow 00:00:19.48000:00:19.490 inside the tubes is by gravity but the 00:00:24.47000:00:24.480 design gets complicated to get a uniform 00:00:27.85900:00:27.869 distribution of the liquid as it flows 00:00:31.70000:00:31.710 down inside the tubes to obtain improved 00:00:35.97900:00:35.989 distribution of the flow distributors 00:00:39.92000:00:39.930 are used also sometimes spray nozzles 00:00:44.20900:00:44.219 are used to minimize any non uniform 00:00:49.31000:00:49.320 distribution of the liquid feed the 00:00:52.45900:00:52.469 falling film evaporators can handle more 00:00:56.29900:00:56.309 viscous products then the rising film 00:01:00.17000:01:00.180 evaporators because here now the flow is 00:01:04.03900:01:04.049 mainly by gravity 00:01:06.07000:01:06.080 typically heat sensitive products such 00:01:09.71000:01:09.720 as orange juice concentration is done in 00:01:13.39900:01:13.409 these types of evaporators the typical 00:01:17.60000:01:17.610 residence time is fairly short anywhere 00:01:21.53000:01:21.540 from twenty to thirty seconds in 00:01:24.85000:01:24.860 comparison to three to four minutes in 00:01:28.13000:01:28.140 the rising film evaporators there is 00:01:32.99000:01:33.000 another variation of an evaporator 00:01:36.23000:01:36.240 design that involves a rising film 00:01:40.37000:01:40.380 section in the beginning part of the 00:01:43.42900:01:43.439 evaporator and then a falling film 00:01:46.03900:01:46.049 section in the second part of the 00:01:49.13000:01:49.140 evaporator as seen in this animation so 00:01:53.66000:01:53.670 the liquid feed first goes through the 00:01:57.80000:01:57.810 rising film section where the feed gets 00:02:01.55000:02:01.560 pre concentrated and then it is allowed 00:02:04.70000:02:04.710 to fall by gravity in ten films in the 00:02:09.91900:02:09.929 falling film section of the evaporator 00:02:12.88000:02:12.890 again these types of variations allow 00:02:17.41000:02:17.420 use of these evaporators for specific 00:02:21.92000:02:21.930 applications for heat sensitive foods
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Engineering company LOTUS®
Russia, Ekaterinburg, Lunacharskogo street, 240/12