Small triangle channels are frequently encountered in microelectromechanical systems (MEMS). In this paper, the electro-osmotic flows with a constant wall temperature in triangle microchannels are studied. We numerically solved the Poisson equation for electric potential, the Navier-Stokes equation, and the energy equation for the mixed electroosmotic/pressure driven flows with varying physical properties in triangle microchannels using the Galerkin method. The effects of the pressure gradient, the length ratio, κDh, and Joule heating on mass flux of electro-osmotic flow are discussed, respectively. The numerical results show the mass-flux increases with the increase of imposed positive pressure gradient. A larger Joule number leads to a larger mass flux of electrolytic solution under positive pressure gradient. It is also found that the mass flux increases with increasing the length ratio, κDh, at a given pressure gradient. The increase in Ju number induces a larger increase in the mass flux at a larger κDh.

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