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Full text of "The Flow Of Gases In Furnaces"

88

RATIONAL CONSTRUCTION   OF FURNACES

if

still. in operation, and which infringe the most simple natural
laws, that is to say, a veritable collection of the monstrosities of
furnace design.

The Subdivision of a Current of Hot Gas.  Assume that the
current of hot flowing gas Q, which is giving off heat or cooling,
is to be divided between two vertical ascending channels, gi and #2,
this division to be effected in the manner shown in Fig. 45. The
veins of gas q\ and q% are at temperatures ti and fe and gi = <?2
and i = fe. Assume that during the operation of this system the
amount of heat lost from the branch q\ is a little greater than the
amount of heat lost from the branch q% and that, accordingly,
the temperature ti becomes slightly less than fe- When fe> ti, the

FIG. 46.
weight of the column of gas q\ becomes greater than that of the
column of gas #2, and accordingly the velocity of the current qi
will become less than that of the current #2- The decrease of the
velocity of the current of gas qi results in a further lowering of
its temperature t\; in other words, the velocity of the current of
gas qi will continue to diminish, and its temperature t\ will con-
tinue to decrease. During this time the velocity of the current
of gas #2 will, on the contrary, be increased, and its temperature
will become higher. The current of gas q\ will finally cease to
flow and the entire volume of the current of gas Q will then pass
through the branch q%. But there will still be a loss of heat from
the channel qi and after the velocity of this current has decreased
to zero it will reverse and travel in the opposite direction, as is