A class of generalized Randall-Sundrum type II ( RS ) brane-world models with Weyl fluid are confronted with the Gold supernovae data set and BBN constraints .
We consider three models with different evolutionary history of the Weyl fluid , characterized by the parameter \alpha .
For \alpha = 0 the Weyl curvature of the bulk appears as dark radiation on the brane , while for \alpha = ~ { } 2 and ~ { } 3 the brane radiates , leaving a Weyl fluid on the brane with energy density decreasing slower than that of ( dark ) matter .
In each case the contribution \Omega _ { d } of the Weyl fluid represents but a few percent of the energy content of the Universe .
All models fit reasonably well the Gold2006 data .
The best fit model for \alpha = 0 is for \Omega _ { d } = 0.04 .
In order to obey BBN constraints in this model however , the brane had to radiate at earlier times .