FIELD: signalling and acoustic intensification of heat-and-mass exchange processes. SUBSTANCE: piston has not contact with tube walls and is directed in tube by means of antifriction bearings so that sliding friction is replaced by rolling friction. To prevent gas overflow through clearance between tube walls and piston which balances pressure on both sides of piston and to avoid acoustic short circuit inhibiting the radiation, value of clearance must not exceed viscous wave length at piston oscillation frequency. In this case, gas viscosity in clearance and its inertia provide for required tightness of clearance. EFFECT: higher reliability in operation. 4 cl, 1 dwg
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