Newtonian flow past a sphere in a tube of finite radius was investigated experimentally and numerically. The flow visualization technique using He-Ne laser as a light source has been employed to study the vortex characteristics occurring on the backside of the sphere which is set stationary inside the tube moving vertically. It has been revealed that the vortex size decreases as the ratio of sphere to tube diameter(α) increases. Galerkin finite element simulation was able to predict those phenomena almost exactly and also used to calculate the drag coefficients which very with the Reynolds number and α.