Movement of steam along the sides of containers during steam treatment of soil
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Aerated steam and steam are commonly used for treating soil in the glasshouse, nursery,
and mushroom industries to control soil-borne plant pathogens. In treating soil in
containers there is an important and disturbing tendency for the soil next to the
container sides to attain the desired temperature more rapidly than does that in the
central mass. This “edge effect” cannot be eliminated, but can be diminished by: a)
treating soil in layers not more than 30 cm thick;b)
using large flow rates of aerated steam or steam, preferably injected through a plenum
at the top;
c)
treating soil in beds by the Thomas or surface method or by buried perforated pipes
or tiles, treating soil in flats or pots by a vault steamer, and treating bulk soil
by a perforated-pipe steam box or a transit-type concrete mixer;
d)
inserting vertical partitions or open pipes in the central mass if a plenum-type steam
box or a mobile bin and potting table is used;
e)
using very porous soil mixtures. Temperature measurements should be made in soil at
the bottom center when steam is injected through a top plenum, and at the top center
when steam injection is through a bottom plenum.
[1] Imants Reba,et al. Applications of the Coanda Effect , 1966 .
[2] Markus Reiner. The teapot effect…a problem , 1956 .