Transient Two-Layer Electroosmotic Flow and Heat Transfer of Power-Law Nanofluids in a Microchannel
Abstract
:1. Introduction
2. Problem Formulation
2.1. Electric Potential Distribution
2.2. Two-Layer Velocity Distribution and Flow Rates
2.3. Two-Layer Temperature Distribution and Heat Transfer Rate
2.4. Entropy Generation Analysis
2.5. Solutions of Modelling and Validation
2.5.1. In the Case of Newtonian Fluids
2.5.2. In the Case of Power-Law Nanofluids
3. Results and Discussion
3.1. Flow Characteristics in Two-Layer
3.2. Heat Transfer Characteristics in Two-Layer Flow
4. Conclusions
- (1)
- The hydrodynamic behavior of transient two-layer EOFs of power-law nanofluids in a slit microchannel were investigated by evaluating the transient two-layer velocity distribution at different times and with different two-layer flow rates.
- When driven by shear thinning nanofluid, the two-layer flow accelerates for thinner EDL thicknesses and decelerates when driven by shear thickening nanofluid. The change in fluid type of pumped nonconducting nanofluid exerts only a slight influence on velocity near the two-liquid interface. It is concluded that compared to the fluid type of pumped nonconducting nanofluid, the fluid type of the pumping conducting nanofluid plays a dominant role in two-layer flow and alters the effect of the electrokinetic width, K.
- In practical terms, the selection of a conducting nanofluid is crucial, as is the use of electrokinetic width to adjust two-layer flow for different types of conducting nanofluid.
- As opposed to the variation of the flow rate ratio with n2, the variation with n1 is nonlinear, and the flow rate of two-layer flow driven by shear thinning nanofluid is more sensitive to changes in the nanoparticle volume fraction.
- (2)
- With steady two-layer velocity obtained, the thermally developed heat transfer characteristics were discussed by presenting the temperature distribution, Nusselt number, and total entropy generation at different parameters.
- The fluid type of the pumping conducting nanofluid, Brinkman number, nanoparticle volume fraction, and electrokinetic width all play important roles in the temperature profile, Nusselt number, and total entropy generation; in contrast, the influence of the type of pumped nonconducting nanofluid is weak.
- In terms of the interactive influence of the governing parameters, shear thickening feature of the conducting nanofluid tends to suppress the effects of the Brinkman number and electrokinetic width on heat transfer and entropy generation.
- No matter what type of conducting nanofluid is considered, increasing the nanoparticle volume fraction within a specified range truly enhances the heat transfer performance of two-layer flow.
- Entropy generation in two-layer flow driven by shear thinning nanofluid is more sensitive to changes in electrokinetic width, Brinkman number, and nanoparticle volume fraction.
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
Appendix A
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Deng, S.; Xiao, T. Transient Two-Layer Electroosmotic Flow and Heat Transfer of Power-Law Nanofluids in a Microchannel. Micromachines 2022, 13, 405. https://doi.org/10.3390/mi13030405
Deng S, Xiao T. Transient Two-Layer Electroosmotic Flow and Heat Transfer of Power-Law Nanofluids in a Microchannel. Micromachines. 2022; 13(3):405. https://doi.org/10.3390/mi13030405
Chicago/Turabian StyleDeng, Shuyan, and Tan Xiao. 2022. "Transient Two-Layer Electroosmotic Flow and Heat Transfer of Power-Law Nanofluids in a Microchannel" Micromachines 13, no. 3: 405. https://doi.org/10.3390/mi13030405