| http://www.w3.org/ns/prov#value | - The use of an ordinary flow pipe or tube is often unsuccessful due to the peculiarity of the material, its tendency to flow in layers or, in the case of two-phase flow, to agglomerate in the form of balls and bubbles, resulting inevitably in an irregu-. lar phase separation. in addition to such machines as screws, coils, stirrers, thinfilm evaporators, so-called tubular evaporators such as expan s
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