Interplay of dual streaming potentials on electroosmotic mixed convection flow in a vertical microannulus with Joule heating effect

A comparative analysis of dual streaming potentials on electroosmotic mixed convection flow formation in a vertical microannulus with Joule heating effect is carried out in this article. The electric potential, momentum and energy equations governing flow formations and heat transfer are derived and solved exactly using the method of undetermined coefficients. Relative to what is known in the literature, dual distinct streaming potentials are found to be induced due to the Joule heating term entering the energy equation, which led to a quadratic function of streaming potential in the momentum equation. Results obtained showed that these streaming potentials are real, distinct and behave differently on flow formations and heat transfer. It is found that heat transfer and skin-friction for normal streaming potential are increasing function of Joule heating term and magnitude of electroosmotic parameter respectively. The findings in this article has significant applications in liquid separations at microlevel, enhancements of flow rate in micropumps and soil conditioning.