Ionic Winds for Locally Enhanced Cooling
D. Go, S. V. Garimella, T. S. Fisher, and R. K. Mongia “Ionic Winds for Locally Enhanced Cooling,” Journal of Applied Physics Vol. 102, 053302, 2007; also published in October 1, 2007 issue of Virtual Journal of Nanoscale Science & Technology.
Ionic wind engines can be integrated onto surfaces to provide enhanced local cooling. Air ions generated by ﬁeld-emitted electrons or a corona discharge are pulled by an electric ﬁeld and exchange momentum with neutral air molecules, causing air ﬂow. In the presence of a bulk ﬂow, ionic winds distort the boundary layer, increasing heat transfer from the wall. Experiments demonstrate the ability of ionic winds to decrease the wall temperature substantially in the presence of a bulk ﬂow over a ﬂat plate, corresponding to local enhancement of the heat transfer coefﬁcient by more than twofold. Multiphysics simulations of the corona and ﬂow describe the ability of the ionic wind to distort a bulk ﬂow boundary layer and conﬁrm the experimentally observed heat transfer enhancement trends.
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