Study The Combined Effect Of Eof/Pdf On The Performance Of Parallel Flow Microchannel Heat Exchanger At Different Concentrations


Donia A. Mohmmaed*, Mushtaq I. Hasan, Ahmed J. Shkara


Mechanical Engineering Department, College of Engineering, University of  Thi-Qar

Corresponding Author Email: donia.ali@utq.edu.iq

This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

In this paper, a numerical investigation has been made for square microchannel heat exchanger (MCHE) at hydraulic diameter 20 μm, and the diluted water 1:1 potassium chloride (KCl) solution is used as a working fluid at different concentrations ionic concentration 〖10^(-2),10^(-5),10〗^(-8) M with a comparison with pure pressure-driven for silicon microchannel. Solving three-dimensional Poisson-Boltzmann equations and Navier-stoke equations with an electric field applied on electrolyte solution using the finite volume scheme. The results showed that ionic concentration plays a significant role in electric double layer thickness and, hence affects on the performance of MCHE, increasing the EDL thickness and increasing the effect of EDL on thermal and hydraulic performance. The ionic concentration is the main parameter that depended on the electric double layer thickness, where the relation between ionic concentration and EDL thickness is reverse as increased the concentration decreasing the EDL thickness. Enhancement ineffectiveness and heat transfer rate with different simple between heat transfer for hot channel and hot channel due to affect the temperature on EDL thickness.