%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

\def\schrift{11pt}
\input format

\def\baselinestretch{1.1}

\begin{document}

\Blatt{11}{WS 2003/2004, 2.2.2004}
         {Mechanik der Kontinua}
         {Prof. J.~L.~van~Hemmen}

\begin{deflist}{20.}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%


\item[26.]
{\bf Couette-Strömung}
\par\smallskip
Zwei koaxiale Kreiszylinder, der innere mit Außenradius $R_1$, der
äußere mit Innenradius $R_2$, rotieren mit den Winkelgeschwindigkeiten
$\omega_1$ bzw. $\omega_2$. Dazwischen befindet sich ein viskoses
Newton'sches Fluid. Die sich ausbildene Strömung heißt
Couette-Strömung.
\begin{enumerate}
\item Berechnen Sie den Geschwindigkeitsverlauf der stationären
  Strömung. Die Volumenkräfte seien vernachlässigbar.
\item Was ergibt sich für $R_1=0$?
\item Was ergibt sich für $\omega_2=0$ und $R_2 \to \infty$?
\item Zur Messung der Zähigkeit einer Flüssigkeit kann man das
  Couette-Viskosimeter verwenden: Der innere Zylinder hängt an einem
  Torsionsfaden und ruht im stationären Fall, der äußere bewegt sich
  mit konstanter Winkelgeschwindigkeit. Anhand der Verdrillung des
  Torsionsfadens wird das auf den inneren Zylinder wirkende Drehmoment
  $M$ gemessen. Berechnen Sie hieraus die Zähigkeit.
\end{enumerate}


\par\smallskip
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\end{deflist}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\vfill 

\footnotesize
\rule[.5mm]{\textwidth}{0.1mm}\\
Besprechung der "Ubungen am 9.2.2004 um 14.15 Uhr im Raum PH 127
(Garching).\\
"Ubungsleitung: Moritz Franosch, mail@Franosch.org, http://www.physik.tu-muenchen.de/lehrstuehle/T35/.

\end{document}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
