Self-similar solution of a problem on jet shape with interface under an action of longitudinal force

A problem of axisymmetric flow of incompressible fluid under an action of constant longitudinal force is considered. A sourse of this force can be gravitation or electric field acting on charged liquid. The problem peculiarity is uncertainty of flow boundary, and interface must be found in solution process as well. Exact self-similar solution of problem was found in boudary layer approximation.