  Using absorbance measurements through a Couette cell containing an emulsion
of buoyant droplets, volume fraction profiles are measured at various shear
rates. These viscous resuspension experiments allow a direct determination of
the normal stress in the vorticity direction in connection with the suspension
balance model that has been developed for suspensions of solid particles. The
results unambigously show that the normal viscosity responsible for the
shear-induced migration of the droplets is independant on the capillary number,
implying that particle deformation does not play a great role. It is similar to
that of rigid particles at volume fractions below 40\% but much smaller at
higher ones.
