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Next: Rigid Tank with Nozzle Up: General Model and Non-dimensioned Previous: Isothermal Process in The Index A Note on the Entrance Mach number
The value of Mach number, Two equations must be solved for the Mach numbers at the duct entrance and exit when the flow is in a chokeless condition. These equations are combinations of the momentum and energy equations in terms of the Mach numbers. The characteristic equations for Fanno flow (9.50), are and where 
is defined by equation (9.49).
The solution of equations (11.18) and
(11.19)
for given
Next: Rigid Tank with Nozzle Up: General Model and Non-dimensioned Previous: Isothermal Process in The Index Created by:Genick Bar-Meir, Ph.D. On: 2007-11-21 If you want the whole book or parts in pdf or other formats, then click here. You also can get the best and the largest gas dynamics tables in the world. About Potto Project
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is a function of the resistance,
.
The exit pressure, 
is different from 
in some situations.
As it was shown before, once the flow became choked the Mach number,
![$\displaystyle \frac{4fL}{D} = \left[ {\left.\frac{4fL}{D}\right\vert _{max} } \right]_{1} - \left[ {\left.\frac{4fL}{D}\right\vert _{max} } \right]_{2}$](img1240.png)
![$\displaystyle {P_2 \over P_{0}(t)} = \left[ 1+ {k-1 \over 2} {M_{2}}^{2} \right...
...k-1}{2} {M_{2}}^{2}} {1+ \frac{k-1}{2} {M_1}^{2}} \right] ^ {\frac{k+1}{k-1}} }$](img1241.png)
yields the entrance
and exit Mach numbers.
See advance topic about approximate solution for large resistance,
.