  We calculate the mean electromotive force in plane Couette flows of a
nonrotating conducting fluid under the influence of a large-scale magnetic
field for driven turbulence. A vertical stratification of the turbulence
intensity results in an alpha effect owing to the presence of horizontal shear.
Here we discuss the possibility of an experimental determination of the
components of the alpha tensor using both quasilinear theory and nonlinear
numerical simulations. For magnetic Prandtl numbers of the order of unity, we
find that in the high-conductivity limit the alpha effect in the direction of
the flow clearly exceeds the component in spanwise direction. In this limit,
alpha runs linearly with the magnetic Reynolds number Rm while in the
low-conductivity limit it runs with the product Rm*Re, where Re is the kinetic
Reynolds number so that for given Rm the alpha effect grows with decreasing
magnetic Prandtl number.
  For the small magnetic Prandtl numbers of liquid metals, a common value for
the horizontal elements of the alpha tensor appears, which makes it unimportant
whether the alpha effect is measured in the spanwise or streamwise directions.
The resulting effect should lead to an observable voltage in both directions of
about 0.5 mV for magnetic fields of 1 kgauss and velocity fluctuations of about
1 m/s in a channel of 50 cm height (independent of its width).
