CFD analysis of double-layer microchannel conjugate parallel liquid flows with electric double-layer effects

This work deals with a code development using a finite-volume scheme art a double-layer microchannel conjugate heat transfer problem consisting of the simultaneous determination of the temperature field in both the solid subs trate and the fluid, with streaming potential as the driving force. The con cept of electric double layer (EDL) was introduced to explain the microscal e deviation. Governing equations were derived for fully developed rectangul ar microchannels' pressure-driven flows. Toward a realistic modeling of the problems, we conducted a conjugate analysis that solves both the solid and liquid regions. An additional source term resulting from the EDL effects w as introduced in the conventional momentum equation, thereby modifying the flow and heat transfer characteristics. Analysis concerning the comparison of the double-layer configuration versus the conventional single-layer micr ochannel heat sink were included. The computed results reveal significant d eviations in the velocity and temperature profiles under EDL effects, in pa rticular, when the hydraulic diameter of the channel is less than 40 mum.