Manfred Müller,
                                
                                Joachim Naumann  
                                   (1979)   
                
                
                    
                        
                            
            This is the last from a series of three papers dealing with variational equations of Navier-Stokes type. It is shown that the theoretical results from the preceding parts (existence and regularity of solutions) can be applied to the problem of motion of a fluid through a tube.