Nanofluid flow and heat transfer in a microchannel with interfacial electrokinetic effects

Abstract

The behaviour of microchannel flow of a nanofluid between two parallel flat plates in the presence of the electrical double layer (EDL) is investigated in this paper. The problem is formulated based on the Buongiorno nanofluid model with the electrical body force due to the EDL being considered in the momentum equation. As one of the highlights of the present investigation, the unphysical assumption introduced in previous studies often leading to the discontinuities of flow field that the electrostatic potential in the middle of the channel has to be equal to zero is eliminated. In addition, the inappropriate assumption that the pressure constant is treated as a known condition is also rectified. The new model is developed with the governing equations being reduced by a set of dimensionless quantities to a set of coupled ordinary differential equations. Based on the analytical approximations, the influences of various physical parameters on the flow field and temperature field, and the important physical quantities of practical interests are analysed and discussed in detail.

Fully Developed Flow of a Nanofluid through a Circular Micropipe in the Presence of Electroosmotic Effects

“…is is consistent with the results obtained by Gong and Wu [56], according to which the resistance due to EDL is greater near the boundaries as compared to the mid part of the channel. Additionally, according to Zhao et al [54], the resistance in the velocity due to EDL is reduced with increase in κ, which is also evident in this case.…”

“…With a uniform dielectric constant and the assumption that the thermal energy is significantly larger than the electrical potential, the Poisson-Boltzmann equation 1is reduced to [54] 1 r…”

“…erefore, it can be stated that the applied technique is convergent. For the validation of the obtained solution, the approach used by [54] is used. Accuracy of the solution is checked using the maximum total average squared error which is given as…”

Influence of interfacial electrokinetic on MHD radiative nanofluid flow in a permeable microchannel with Brownian motion and thermophoresis effects

“…2 , where T 0 represents the reference temperature and C 0 represents the volumetric fraction of the reference nanoparticle at the channel entrance. As the temperature T and volumetric fraction of the nanoparticle C vary linearly with x [21,22], we obtain With the above supposition, we see that the continuity equation is satisfied, and rest of the governing equations are simplified to the following equations:…”

“…Particularly, Wang and Peng [21] found that the transmission and laminar heat transformation in microchannels is strange and quite complex with a conservatively sized condition. Zhao et al [22] discussed the heat transfer investigation of the nanofluid flow in a microchannel. Recently, some researchers studied the heat transfer flow of nanofluids for different purposes [23][24][25][26][27][28][29][30][31][32][33].…”