Heat transfer intensification in an actuated heat exchanger submitted to an imposed pressure drop

Kevin Schmidmayer (1) , Prashant Kumar (2) , Pascal Lavieille (3) , Marc Miscevic (3) , Frederic Topin (2)

1 Caltech Division of Engineering and Applied Science
2 IUSTI - Institut universitaire des systèmes thermiques industriels
3 LAPLACE-GREPHE - Groupe de Recherche Energétique, Plasmas et Hors Equilibre

This paper is dedicated to the analysis of the improvement of heat transfer and the reduction of the pressure losses induced by the use of an active exchanger of millimeter size in a cooling loop. For pressure conditions imposed at the terminals of such a mini-channel whose upper wall is deformed by a progressive sinusoidal wave and for low Reynolds numbers (Re < 1000), we study the influence of the deformation parameters on the thermo-hydraulic performance of the exchanger (flow, heat transfer). The mechanical power applied to the deformed wall is connected to these parameters as well as to the pressure difference imposed by the external pump. The overall performance increases slightly with the value of the mechanical power up to a critical value for a given wall corrugation. Nevertheless, overall performance is up to 2 orders of magnitude higher than conventional static corrugated channels.

Mots clés: Flow rate; Fluid flow; Fluids; Reynolds number; Deformation; Fluid dynamics; Statics; Aspect ratio

Domaines: Thermique [physics.class-ph]; Modélisation et simulation; Mécanique des fluides [physics.class-ph]

Kevin Schmidmayer, Prashant Kumar, Pascal Lavieille, Marc Miscevic, Frederic Topin. Heat transfer intensification in an actuated heat exchanger submitted to an imposed pressure drop. PLoS ONE, 2019, 14 (7), pp.e0219441. ⟨10.1371/journal.pone.0219441⟩. ⟨hal-02310271⟩