Schauberger
This 'original' cooling of the flowing water takes place because the medium can be accelerated without being retarded by the direct action of wall-pressures. In this case, therefore, the resistance to motion that normally increases by the square of the increase in velocity - the reactive effect of all centrifugal pressure - cannot develop. [The Energy Evolution - Harnessing Free Energy from Nature, Cadaverine Poison in Ray-Form - Ptomaine Radiation]