64 APPLICATION OF THE LAWS OF HYDRAULICS
Let "y = the initial velocity of the fluid in motion;
Am=the specific weight of the fluid in motion;
Ai = ihe specific weight of the fluid at rest.
The weight of each unit of volume of the fluid in motion is less
than A*. The upward force which acts upon each unit volume of
the fluid in motion is, therefore, equal to A* — Aw. The upward
acceleration due to this force is
^//////////A
FIG. 43.
The depth to which the jet will descend for this case is
ry v2 sin2 5 Am
For hot gases
from
2g
A°
Am =
A°
Ao
H=-
2
sn
2g
Ao Ac
l+at,
2g
1+att l+atm
R_v2 sin2 B a+ti =v2 sin2 d 273+t,
2g tm-ti 2g X tm-tf
For vertical jets, when 5 = 90°, this formula becomes
H^X~l^k
(F)