# Full text of "The Flow Of Gases In Furnaces"

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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.)