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Full text of "The Flow Of Gases In Furnaces"

THE  CURRENT OF HOT  GASES

than the air, it is found necessary to confine them%g><m-; the top
and the sides.

This may be more
clearly comprehended
by means of the fol-
lowing laboratory ex-
periment :

It is possible to
pour a gas from one
container to another
by employing a slop-
ing trough to guide

its  flow.     This  may                              FlG  5

be done with carbon -

dioxide gas, which is heavier than air, and also with hydrogen,
which is lighter than air.    When the carbon dioxide is being

poured, the stream of gas must be
confined below and upon its sides
(Fig. 5). The hydrogen, on the
other hand, must be confined
upon the top and the sides (Fig. 6).
There is evidently nothing
which confines the current of car-
bon dioxide upon the top and the
stream of hydrogen on the bottom.
These experiments require care,
but are easy to make if the
surrounding air is absolutely still
and free from currents. & The
gases may be poured equally well
whether there is a fourth wall or
not.
FIG. G.                         These experiments lead to the

following conclusions:

Streams of incandescent gas need be confined only upon the
top and sides, and, in effect, all reverberatory furnaces confine
the stream of hot gases in this manner, at the top (the roof) and

(1)A condition which is neglected in the above experiment, is the tendency
of all gases to form homogeneous mixtures by diffusion. In both experiments
there will be a slight mixing with the air, as a result of this tendency.