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VELOCITY IN INVERTED WEIRS

53

weir according  to the depth of the layer or stream of gases,
It is

or    Q = j

A3

in which o;=the area of the cross-section;

B = the length of the weir or width of the furnace;
ht=the depth or thickness of the stream of gases under

the inverted weir or the head at the crest;
t — the temperature of the hot gases;
Q = the volume of gases flowing;
A = a coefficient.

From which

h >i...........;                             n~~,

and    v==s \I~JT3

NORMAL VELOCITY OF GAS FLOW UNDER INVERTED WEIR
B = 1 m 00 = width of furnace, corresponding to length of weir.

Al-
A =
 t
	1 mOO 2.97
	Om 75 3.13
	0 m 50 3.29
	0 m 30 3.42

	Velocity, Meters per Second =?;
			
500°
	4.368
	3.497
	2.650
	1.936

600°
	4.785
	3.830
	2.913
	2.121

700°
	5.168
	4.138
	3.135
	2.291

800°
	5.526
	4.423
	3.352
	2.450

900°
	5.861
	4.691
	3.555
	2.598

1000°
	6.178
	4.945
	3.747
	2 . 739

1100°
	6.479
	5.186
	3.930
	2.872

1200°
	6.768
	5.417
	4.105
	. 3.000

1300°
	7.046
	5. 638
	4.272
	3.122

1400°
	7.310
	5.852
	4.434
	3.240

1500°
	7.566
	6.056
	4.589
	3.354

1600°
	7.814
	6.256
	4.739
	3.464

1700°
	8.055
	6.458
	4.885
	3.571

1800°
	8.288
	6.634
	5.044
	3.674

a-
	l.OOt;
	0.75/>
	0.50?;
	0.30?;

(For the values of A refer to page 41.)