Low noise cooling device

R.M. Aarts (Inventor), C.J.M. Lasance (Inventor), J.A.M. Nieuwendijk (Inventor), O. Ouweltjes (Inventor)

Research output: PatentPatent publication

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A cooling device (1) using pulsating fluid for cooling of an object, comprising: a transducer (2) having a membrane adapted to generate pressure waves at a working frequency (fw), and a cavity (4) enclosing a first side of the membrane. The cavity (4) has at least one opening (5) adapted to emit a pulsating net output fluid flow towards the object, wherein the opening (5) is in communication with a second side of the membrane. The cavity (4) is sufficiently small to prevent fluid in the cavity (4) from acting as a spring in a resonating mass-spring system in the working range. This is advantageous as a volume velocity (u1) at the opening is essentially equal to a volume velocity (u1') at the second side of the membrane, apart from a minus sign.; Thus, at the working frequency the pulsating net output fluid can be largely cancelled due to the counter phase with the pressure waves on the second side of the membrane resulting in a close to zero far-field volume velocity. Thus a low sound level is achieved, at a low cost, without requiring mechanical symmetry.
Original languageEnglish
Patent numberUS8218318
Publication statusPublished - 10 Jul 2012


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