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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.)