Normally used for liquids which are prone to fouling ,scaling,crystallizing or for those which are inversely soluble or while concentrating thermally degradable materials.Here high re-circulation rates allows high liquor velocities through the tubes which help to minimize the buildup of deposits or crystals along the heating surface.
Long tube type evaporator where power is utilized to drive the fluid through the evaporator tubes subsequently delivering high tube velocity.In constrained circulation evaporator fluid is circled through the cylinders at high pressing factor by methods of pump.
At the point when the fluid leaves the cylinders and enters the fume head, pressure falls out of nowhere. This leads to the glimmering of too warmed alcohol.This evaporators is appropriate for thermolabile substances on account of fast evaporating.