Turbulent heat transfer analysis of supercritical carbon dioxide close to the pseudo-critical point in microchannels under non-uniform heat flux boundary conditions

Abstract

With the development of ever more compact electronics device and the need to manage the increasing heat flux, new potential technologies are tested. This studyinvestigates to use a microchannel-based heat exchanger using supercritical carbon dioxide near the critical point. The first part of this work consists is an experimental study of the heat exchanges steady-state to determine the influence of the different parametersover the heat exchange. It is followed by an experimental study in transient regimes to analyse the response of the system to transient heat flux or transient mass flux After the experimental part, a predictive model is developed for the steady-state conditions and anohter model for the transient conditions. They are compared to the experimental results. Finally, some conclusions are drawn considering the performance of this technology in the application of electronics cooling.