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 Blending
includes the prevention of stratification in blended products,
elimination of solidification and crusting at the product surface,
heat transfer for uniform product temperature and blending
of two miscible fluids.
All
of these applications require basically the same approach with
respect to fluid flow patterns and mixer horsepower ratings. It
is generally accepted that the most desirable flow pattern
in blending operations is a slight horizontal "swirl" combined
with considerable vertical turnover.
To
accomplish this, the mixer is installed at a slight angle with
respect to the tank center line. This angle will vary
from 10º in large tanks to 7º in small tanks. In
most cases it is desirable to locate the mixer close to and
clockwise from the fill line.
Operating
procedure is one of the most important factors affecting blending
applications. When writing specifications. When
writing specifications, engineers should give special attention
to this as required horsepower in identical tanks may vary
greatly due to different procedures.
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