THE EFFECT OF A RESONANT ACOUSTIC FIELD ON LAMINAR FLOW IN A CIRCULAR TUBE.

Abstract : The analytical and the experimental study considered flow in a circular tube. The conclusions from these investigations are: (1) A resonant acoustic field will produce steady secondary flow in a channel or a circular tube with or without through flow; (2) the size of the standing vortices which are formed in the case of through flow is, to a first approximation, solely a function of the parameter M/sq M sub 0; (3) the effect of sound on the local heat transfer rate for a horizontal isothermal tube as obtained by Jackson is qualitatively explained in terms of the flow field which was observed experimentally and predicted analytically, and (4) the sound threshold levels obtained by Eastwood (the sound levels below which a resonant acoustic field does not locally affect the heat transfer rate) correspond to conditions for which M/sq M sub 0 approx 63. (Author)