not been observed; yet is predicted, according to Eq. , to be attractive. This prediction is potentially relevant for atomic waveguides, i.e. geometries in which BECs can be transported. If the velocity of the BEC in the atomic waveguide is less than the Landau critical velocity beyond which the BEC can be destroyed by inelastically interacting with the wall, then the Bogoliubov excitations in the moving condensate would be unaltered from that for the static case. So, the Casimir force for the slowly moving condensate in an atomic waveguide is expected to be attractive along the radial ($\hat{\rho}$) direction, and it may not affect the flow along the perpendicular ($z$) direction. On the other hand, if the velocity of the condensate is more than the Landau critical velocity, then the condensate can inelastically interact with the wall. Since the attractive Casimir force between any two parts (semi-cylindrical walls) of the cylindrical tube may induce shrinking of its cross-section, there would be an enhancement of inelastic collisions with the cylindrical wall. Thus, the attractive Casimir force may slowdown the condensate if it is strong enough to shrink the cross-section. This is possible for a sufficiently small radius of a cylindrical waveguide 