Laminar flow field in a viscous liquid impinging jet confined by inclined plane walls

► Experiments and computations on laminar confined 3D planar impinging jet flows. ► Flow is symmetric and exhibits spiraling motion inside the impinging plate cell. ► The recirculation length increases with the height of the exit channel. ► The recirculation length decreases with the angle of the sloping wall. ► The wavelength of the spiraling motion decreases with the height of the channel.