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Next: Overview of the primary Up: Singular pressure changes Previous: Two-phase flows Contents Index
Sudden expansion
For a sudden contraction the expression
![\begin{displaymath}
\Delta p_{\mbox{\protect\scriptsize cont}} \;\hbox{$=$\kern...
...( \frac{\rho_\ell}{\rho_g}
-1\right)\mbox{$<\!{x}\!>$}\right]
\end{displaymath}](img1005.gif)
correlates both single and two-phase flow reasonably well [18]. As seen in (5.31) we use a homogeneous two-phase friction multiplier in order to account for the increased pressure change in two-phase flow.
The contraction loss coefficient
[--] is given in Table
5.2. When compared to the figure in Weismann [11] we
conclude that the values in the table correspond to a very high Reynolds number.
We should note that the values of
as a function
of 
given by different authors show considerable scatter probably
because some authors fail to recognize a dependence of Reynolds number on the
contraction loss coefficient. For reference we have compared values of
from different sources in Figure 5.3.
![\begin{figure}
% latex2html id marker 20412\rule{\textwidth}{0.2mm}
\rule{0cm}...
...d ($\cdot$): Collier \& Thome
\protect\cite[p. 111]{Collier1}.}
\par\end{figure}](img1011.gif)
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