We investigate bipolar fluids with delay in a $2D$ channel $\mathrm{\Sigma }=\mathbb{R}\times (-K,K)$ for some $K>0$. The channel $\mathrm{\Sigma }$ is divided into a sequence of simply connected, bounded, and smooth sub-domains ${\mathrm{\Sigma }}_n(n=1,2,3\cdot \cdot \cdot )$, such that ${\mathrm{\Sigma }}_n\to \mathrm{\Sigma }$ as $n\to \mathrm{\infty }$. The paper demonstrates that the pullback attractors in the sub-domains ${\mathrm{\Sigma }}_n$ converge to the pullback attractor in the entire domain $\mathrm{\Sigma }$ as $n\to \mathrm{\infty }.$