00:00:01.699 we use agitated thin-film evaporators 00:00:05.95000:00:05.960 for concentrating very viscous fluids 00:00:10.65900:00:10.669 the feed is spread on the inside of the 00:00:15.31900:00:15.329 cylindrical heating surface by the use 00:00:18.71000:00:18.720 of wiper blades that rotate and 00:00:22.54000:00:22.550 continuously scrape the inside surface 00:00:26.48000:00:26.490 of the heating cylinder agitation 00:00:30.11000:00:30.120 results in high convective heat transfer 00:00:33.43000:00:33.440 coefficients which would otherwise not 00:00:36.61900:00:36.629 be possible for these types of high 00:00:39.56000:00:39.570 viscous liquids the cylindrical 00:00:43.27000:00:43.280 configuration of this type of system 00:00:46.50900:00:46.519 suggests that the heating surface area 00:00:50.95900:00:50.969 would be rather low this means that this 00:00:55.04000:00:55.050 type of system requires longer residence 00:00:59.38900:00:59.399 time the processing capacity of these 00:01:02.75000:01:02.760 types of systems would be low also the 00:01:06.85900:01:06.869 maintenance costs are high due to moving 00:01:11.03000:01:11.040 parts within the system
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