COOLING DEVICE AND ELECTRONIC DEVICE COMPRISING SUCH A COOLING DEVICE

摘要

A cooling device using pulsating fluid for cooling of an object (8), comprising a transducer (2) adapted to generate pressure waves at a drive frequency, a tube (3), having a first end adapted to receive said pressure waves from the transducer, and a second end (7) adapted to generate a pulsating net output flow towards the object (8). Compared to a Helmholtz resonator, where the length of the tube is short compared to the wavelength, the length (L) of the tube according to the present invention is greater than ?/10, which has been found to be sufficiently long to avoid Helmholtz resonance. Instead, the tube acts as a transmission line, that applies a velocity gain to the pulsating flow.