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Full text of "The Flow Of Gases In Furnaces"

HOT-BLAST STOVES

99

Withwell. The experiment shown in Fig. 61 illustrates the defect
of the Withwell stove. Stoves of two designs were photographed,
immersed in a glass tank filled with water, WithwelFs design on the
left and the Cowper design on the right. The period illustrated
is that during which they are upon gas, or heating. The uniform
level of the lower surface of the colored kerosene forced downward
through the checker passes of the Cowper stove illustrates the
regularity of the heating of its checkerwork. In the Withwell
stove, on the other hand, the chambers are filled with the colored
kerosene in a manner which is far from uniform. The chambers

FIG. 61.
through which the kerosene descends are completely filled, while
those in which it rises are not filled at all, the kerosene rising in a
thread-like stream which comes into contact with a very small
portion of the wall area of the chamber. These chambers, there-
fore, will not be uniformly heated; and for this reason will impart
very little heat to the air. If water is introduced at the lower
part of the model to represent the cold blast which is being heated,
it will be seen that those chambers through which the water rises
are completely filled, while in those in which the water passes
downward it falls in small streams which have very little contact
with the walls of the chamber. A mere glance at these models is