Abstract

The liquid cooling of electronic components is generally implemented by a mechanical pump, which requires a minimal maintenance to ensure the reliability of the device. To solve this problem, it is proposed to replace the mechanical pump by a static one, for example an electro-osmotic (EO) pump. In this paper, firstly we present the theory of the electro-osmosis phenomena, and a model of a porous EO pump. Then an optimization of a porous EO pump made of sintered silica is presented. It was found that for any porous EO pump the optimum operating point of the pump is determined by controlling the diameter of the effective pore radius of the porous silica and the Debye length. Using deionised (DI) water as pumping liquid, the EO pump generates 13.6 ml/min and 2 kPa at 150 V applied voltage. The power consumed by the pump is less than 0.4 W. The EO pump works without any bubbles in the hydraulic circuit. This design can be used to cool 47 W of power generated by the power components with a forced convection without evaporation and 270 W with evaporation.

Highlights

  • The integration of the power electronic components has become more and more common

  • If we assume that the electronic component has a temperature Tcom equal to the wall temperature Tw, the maximum transmitted power can be written in case of forced convection without evaporation as [2]: PE,m

  • From fig.8, it is seen that the optimum thermodynamic efficiency is maximum when the normalized effective pore radius is 4

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Summary

INTRODUCTION

The integration of the power electronic components has become more and more common. the cooling of these components became more difficult because of the high heat density generated in small area. If we assume that the electronic component has a temperature Tcom equal to the wall temperature Tw (the temperature drop induced by heat conduction in the heat exchanger is neglected), the maximum transmitted power can be written in case of forced convection without evaporation as [2]: PE ,m. Knowing that the flow rate generated by the EK pumps is very small [3], the use of the EO pump is better in the forced convection with evaporation, but in this case the use of deionized (DI) water or any other pure liquid is essential in order to avoid the precipitation of salts in the heat exchanger because of the evaporation.

Discussion
Conclusion on the optimum thermodynamic efficiency
CONCLUSION

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