Investigation of Single Air Bubble Dynamics and the Effect of Nanoparticles in Rectangular Minichannels
| Autor: | Khellil Sefiane, Arzu Özbey, Ali Koşar, Coinneach Mackenzie-Dover, Mehrdad Karimzadehkhouei, John Christy |
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| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Materials science
Bubble Flow (psychology) Nanoparticle 02 engineering and technology Mechanics 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Atomic and Molecular Physics and Optics 0104 chemical sciences Electronic Optical and Magnetic Materials Volumetric flow rate Physics::Fluid Dynamics Nanofluid Heat flux Materials Chemistry Fluid dynamics Deposition (phase transition) Physical and Theoretical Chemistry 0210 nano-technology Spectroscopy |
| Zdroj: | Karimzadehkhouei, M, Özbey, A, Mackenzie Dover, C, Christy, J, Sefiane, K & Koşar, A 2019, ' Investigation of Single Air Bubble Dynamics and the Effect of Nanoparticles in Rectangular Minichannels ', Journal of molecular liquids, vol. 279, pp. 510-517 . https://doi.org/10.1016/j.molliq.2019.01.098 |
| DOI: | 10.1016/j.molliq.2019.01.098 |
| Popis: | Bubble dynamics and understanding related mechanisms based on force analysis are necessary for better understanding two-phase flow phenomena in small channels. To address this subject, experiments were conducted with injected single air bubbles into rectangular minichannels containing flows of pure water, pure ethanol and TiO2-nanoparticle-based nanofluids, which had a nanoparticle mass fraction of 0.005 wt% for both water and ethanol base fluids. For a range of fluid flow rates, bubble movement and temperature profiles were captured along the channel using high-speed and infrared (IR) cameras, respectively. Upon heating, when using nanofluids, deposition of TiO2 nanoparticles occurred. The results in the channels with cross sectional dimensions of 2 mm × 4 mm and heated length of 7 cm were compared with their counterparts on plain surfaces. Heat fluxes were applied by means of a tantalum film heater on the outer surface of the channel. Bubble dynamics and forces acting on the bubbles were quantitatively analyzed in relation to the fluid type, heat flux, flow rate and deposition. This study highlights the effects of TiO2-nanoparticles (dispersed in two different base fluids) on single-bubble dynamics in minichannels. The nanoparticle deposition was found to have a retarding effect on the bubble movement and led to a more elliptical shape rather than a spherical bubble shape. The bubble behavior is comprehensively assessed in the light of the visualization data and acting forces. |
| Databáze: | OpenAIRE |
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