Heat transfer enhancement to an array of synthetic air jets by an induced crossflow

Abstract

Jet vectoring and crossflow enhanced heat transfer to a modular synthetic air jet array consisting of six individually controllable parallel slot jets is investigated. When applied in a multi-jet array, jet vectoring can be implemented to operate as an adaptive, modular heat exchanger capable of dynamically targeting hot spots and enhancing local cooling. Time averaged surface heat transfer distributions are presented for varying Reynolds number, stroke length and axial spacing. It is shown that crossflow is achievable for an array of jets; however vectoring performance is dictated by inter-jet phase delay and limited by axial spacing and stroke length. All operating parameters showed increased levels of heat transfer are produced by operating the array out of phase. In particular, at small axial spacings this is attributed to crossflow generated by the out of phase jet pulsation.