An analysis on the flow resistance in the entrance region of diffuse laminar flow between two parallel spherical surfaces (Q1097786)

V. V. Golubef method is first extended to the diffuse laminar flow between two parallel spherical surfaces. With the boundary layer motion equation in spherical coordinates, we derive the momentum integral equation together with the energy integral equation for the laminar boundary layer of the entrance region between two parallel spherical surfaces. And then by applying Picards gradually approaching method for the momentum integral equation, we get the approximate expression for which the entrance region length varies with the thickness of boundary layer. Every coefficient of entrance region effect is analyzed and calculated.