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Nanoparticles migration due to thermophoresis and Brownian motion and its impact on Ag-MgO/water hybrid nanofluid natural convection

Goudarzi, S ; Sharif University of Technology | 2020

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  1. Type of Document: Article
  2. DOI: 10.1016/j.powtec.2020.07.115
  3. Publisher: Elsevier B.V , 2020
  4. Abstract:
  5. The present study aims to investigate the impact of nanoparticle migration due to Brownian motion and thermophoresis on Ag-MgO/Water hybrid nanofluid natural convection. An enclosure with sinusoidal wavy walls is considered for this investigation; right and cold walls of this enclosure are in constant temperature while the upper and bottom walls are insulated. This simulation follows Buongiorno's mathematical model; Brownian and thermophoresis diffusion of Ag occurs in MgO-Water nanofluid while the diffusion of MgO happens in Ag-water nanofluid. The result indicates that Nu number increments up to 11% by increasing thermophoresis diffusion for both nanoparticles. Also, increasing Brownian diffusion of Ag augments nanoparticle concentration on hot wall, while the accumulation of nanoparticles unifies by incrementing Brownian diffusion of MgO. © 2020
  6. Keywords:
  7. Hybrid nanofluid ; Nanofluid ; Nanoparticles migration ; Natural convection ; Thermophoresis and Brownian motion ; Brownian movement ; Enclosures ; Magnesia ; Nanoparticles ; Oxide minerals ; Silver compounds ; Thermophoresis ; Bottom wall ; Brownian diffusion ; Cold wall ; Constant temperature ; Nanofluids ; Nanoparticle concentrations ; Wavy wall ; Nanofluidics ; Magnesium oxide ; Nanoparticle ; Silver ; Silver magnesium oxide water hybrid nanofluid ; Unclassified drug ; Water ; Algorithm ; Article ; Buongiorno model ; Chemical parameters ; Chemical phenomena ; Concentration (parameter) ; Controlled study ; Density ; Diffusion ; Electrophoresis ; Geometry ; Isotherm ; Mathematical model ; Measurement accuracy ; Mechanics ; Nanofluid volume fraction ; Nanoparticle migration ; Simulation ; Thermal conductivity ; Thermodynamics ; Validation study ; Viscosity
  8. Source: Powder Technology ; Volume 375 , 20 September , 2020 , Pages 493-503
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S0032591020307397