Page 172 - Mechanical Engineer's Data Handbook

where: pr =(g) :;c 161
FLUID MECHANICS

4.6. I Isothermal flow in pipe

Pressure drop:
1 -/=
m
A,=,,(
D2
Mass flow m=p, V,n-
4

4.6.3 Velocity of sound in a gas

v, = Jyp/p = JrRT
V
4.6.2 Flow through orifice Mach number M =-
vs
nJ-7-7 Drag cafflcients for various
4.6.4
Mass flow m=C,A 29 - pIpln2 1-n bodies

where: n=p21p1; p1 =pl/RTl The drag coefficient (non-dimensional drag) is equal to
[A- the drag force divided by the product of velocity
Maximum flow when n = - '- = 0.528 for air. pressure and frontal area. The velocity may be that of
the object through the air (or any other gas) or the air
velocity past a stationary object. Coefficients are given
for a number of geometrical shapes and also for cars,
airships and struts.

Drag coeilkients for various bodies
VZ
Drag D = C,Ap -; p = fluid density; A =frontal area; V= fluid velocity.
2
L
Shape - - A Arrangement
Re
d cd 104