ABSTRACT
Underventilated flames will normally occur for Burke-Schumann solutions if the ratio of the outer diameter (b) and inner diameter (a) approaches unity. True or false? Explain.
Problem 12.2:
Find the height of a methane-air flame in infinite surroundings. The diameter of the burner is 0.373 cm. The flow rate of CH
through the burner is 60 cm
/min. The inlet temperature is 298 K, and the pressure is 100 kPa. (Experimental values are found to be around 1 cm. Assume
rD
=
6.5
×
kg/ m sec
=
constant.)
Problem 12.3:
A mixture of N
(10% by mass) and C
H
flows through an inner duct of 2-cm diameter while air flows through an outer duct of diameter 4 cm. Assume that the Burke-Schumann analysis is applicable (i.e., v
=
constant throughout the cross section of the duct).
