Page 170 - 48Fundamentals of Compressible Fluid Mechanics

132 CHAPTER 8. ISOTHERMAL FLOW
9
8
as 0.02 . Note that tubes are provided in increments of 0.5 [in] . You can assume
.

SOLUTION
At first, the minimum diameter will be obtained when the flow is chocked. Thus,
the maximum
that can be obtained when the
is at its maximum and back
that the soundings temperature to be ('
pressure is at the atmospheric pressure.

Now, with the value of
either utilizing table 8.1 or using the provided program

yields

%

% !

the value of minimum diameter.
With

% 3

%
%(*3

3%&

However, the pipes are provided only in 0.5 increments and the next size is 17[in]
# #
or 0.4318 [m]. With this pipe size the calculations are to be repeated in reversed

to produces:

3

The usage of the above equation clearly applied to the whole pipe. The only point

that must be emphasis that all properties (like Mach number, pressure and etc)
is 3

have to be taken at the same point. The new

# #

%

8 A relative smooth tube of cast iron.
'% 3

'%
%(*3 (
9 It is unfortunate, but is seem that this standard will be around in USA for some time.

% %
3'
'