Experimental Investigation on Flow and Heat Transfer Characteristics of a Needle-Cylinder Type Ionic Wind Generator for LED Cooling

Abstract

Ionic wind cooling for electronic elements is a relevant research field. In order to study the cooling performance of ionic wind on a Light Emitting Diode (LED), an ionic wind generator with a needles-ring electrode configuration was set up. A cylindrical heat sink for the heat dissipation of a heating film representing the LED chip was also manufactured. Following this, the effect of the needle number, the distance between the needles and the ring electrode, and the polarity of the corona discharge on the ionic wind velocity were studied. Finally, the optimal distance between the needles and the ring electrode was adopted to attain the maximum wind velocity with different numbers of needles. After this, the ionic wind device was used to cool the heating film at the working power of 10 watts. The surface temperature of the heating film was measured to evaluate the cooling performance of the ionic wind device. The experimental results indicate that the maximum temperature drop in the heating film center reaches 35.6 • C in the five needle-electrode case, which is very effective and can meet the demands of a 10 watts LED heat dissipation.

A Fractional Derivative Modeling of Heating and Cooling of LED Luminaires

“…where E α (z) denotes the Mittag-Leffler function [26] E α (z) = ∞ ∑ n=0 z n Γ(αn + 1) , (6) and Γ(z) stands for the gamma function [27]. In Figure 3, we plot the variation of the temperature values measured for 50 W and 60 W LED chips in horizontal configuration (the axis of symmetry of the sink is perpendicular to the gravity force) corresponding to situations analogous to that of Figure 2, with the chip placed at the bottom of the heat sink.…”

“…It plays an important role in the context of HP-LED cooling and different types of solutions have been explored in the literature. One possibility is to enhance the heat transfer caused by forced convection with an ionic wind [5,6]. A simpler setting is that of the design: implementation and analysis of passive heat sinks that lead to a faster energy transfer to the surrounding air.…”

Electric Fields in Energy and Process Engineering

“…The released ions produce an electro-hydrodynamic effect, and the induced flow shows flow velocities in the range of a few meters per second [11]. The cooling of electronic elements, such as light emitting diodes (LEDs), is a relevant application of these ion wind generators and this is studied in the contribution of Qu et al [12]. In this work, multiple corona electrodes were used to improve the flow rate of ionic wind for more efficient cooling.…”

Electro-optical characteristics of an innovative LED luminaire with an LED matrix cooling system based on heat pipes

“…Powerful LED light sources are cooled by systems based on different operation principles: passive heat sinks [6,7], thermoelectric coolers [8,9], piezoelectric fans [10], and jet coolers [11]. There also are experimental cooling systems based on the electronic wind phenomenon [12][13][14].…”