Refroidissement des composants électroniques par jets synthétiques

Abstract

This paper examines the effectiveness of using a pulsating cross-flowfluid jet for thermal enhancement in a microchannel. The proposed technique uses a novel flow pulsing mechanism termed (synthetic jet) that injects into the microchannel a highfrequency fluid jet with a zero-net-mass flow through the jetorifice. The microchannelflow interacted by the pulsed jet is modeled as a two-dimensional finitevolume simulation with unsteady Reynolds-averaged Navier–Stokes equations while using the ShearStress-Transport (SST) k–u turbulence model to account for fluid turbulence. For a range of conditions,the special characteristics of this periodically interrupted flow are identified while predicting the associated convective heat transfer rates. Results indicate that the pulsating jet leads to outstanding thermalperformance in the microchannel increasing its heat dissipation by about 4.3 times compared toa channel without jet interaction within the tested parametric range. The degree of enhancement is firstseen to grow gently and then rather rapidly beyond a certain flow condition to reach a steady value. Theproposed strategy has the unique intrinsic ability to generate outstanding degree of thermal enhancement in a microchannel without increasing its flow pressure drop. The technique is envisaged to haveapplication potential in miniature electronic devices where localised cooling is desired over a base heatdissipation load.