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Numerical Study of Joule Heating Effect on Electroosmotic Flow in Rectangular Microchannels with Different Aspect Ratios
Abstract
Joule heating effect on the temperature fields during electroosmosis in glass and PDMS polymer-based rectangular microchannel is numerically investigated in this paper. The mathematical model on Joule heating effects includes Poisson–Boltzmann equation governing the Electric Double Layer field, the modified Navier– Stokes equations governing flow field and the energy equation governing the temperature field due to Joule heating. These fields are strongly coupled via temperature dependent liquid properties. Computations for the temperature field during electroosmosis in the rectangular microchannel are performed with finite element method after simplifying the coupled governing equations. The numerical results indicate that the solution temperature in a PDMS made microchannel is significantly higher than that in a glass made microchannel and the buffer temperature increases as the aspect ratio (W/H) increases.
Keywords
Joule heating effect, electroosmosis, finite element method, rectangular microchannels, aspect ratios.
