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An analytical solution for thermally fully developed combined pressure - electroosmotically driven flow in microchannels

Qazi Zade, A ; Sharif University of Technology | 2007

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  1. Type of Document: Article
  2. DOI: 10.1016/j.ijheatmasstransfer.2006.07.037
  3. Publisher: 2007
  4. Abstract:
  5. An analytical solution is presented to study the heat transfer characteristics of the combined pressure - electroosmotically driven flow in planar microchannels. The physical model includes the Joule heating effect to predict the convective heat transfer coefficient in two dimensional microchannels. The velocity field, which is a function of external electrical field, electroosmotic mobility, fluid viscosity and the pressure gradient, is obtained by solving the hydrodynamically fully-developed laminar Navier-Stokes equations considering the electrokinetic body force for low wall zeta potentials. Then, assuming a thermally fully-developed flow, the temperature distribution and the Nusselt number is obtained for a constant wall heat flux boundary condition. The fully-developed temperature profile and the Nusselt number depend on velocity field, channel height, solid/liquid interface properties and the imposed wall heat flux. A parametric study is presented to evaluate the significance of various parameters and in each case, the maximum heat transfer rate is obtained. © 2006 Elsevier Ltd. All rights reserved
  6. Keywords:
  7. Electric fields ; Electroosmosis ; Heat flux ; Heating ; Hydrodynamics ; Viscosity ; Electrokinetics ; Joule heating ; Microchannels ; Channel flow ; Heat transfer
  8. Source: International Journal of Heat and Mass Transfer ; Volume 50, Issue 5-6 , 2007 , Pages 1087-1096 ; 00179310 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S0017931006005035