OF TWO CONFINED STREAMS OF WATER. 805 
points lie on a straight line, while on plotting the loss with v, constant on a base 
of v,"+2g the points also le on a straight line. These lines are so related that the 
tangent of the inclination of the one is equal to the intercept on the axis of zero 
Loss in foot-lbs. per lb. of impinging jet. 
| 
at 
a 
Be 
A 
ie 
2 . "6 ) 7 
2 
Fic. 3.—Values of 2. 
29 
velocity of the other. Fig. 3 shows the plotting of typical results, these being 
obtained from the pipe having 6=60", and having the areas of passages (1) and (3) 
twice that of passage (2). In this figure two sets of experiments having v, constant are 
‘ 2 
plotted on a - base. 
2g 
From this relationship it follows that the loss is equal to— 
ae 2 
a a +b re foot-lbs. per lb. of impinging jet, 
where @ and 0 are coefficients obtained from the plotted lines. 
When 2, is zero the loss =) 7 feet, and since this is the state of flow round an 
elbow with a dead end, b is the same constant as the “ F” of Table L., § 3. 
The following table shows the mean experimental values of a, while the curves of 
figs. 4 and 5 show graphically the relationship between a, b, ®, and the ratio of 
enlargement of area. 
