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Nov 8, 2024 | 
pubs.aip.org | Crystal Owens |A-Man Zhang |R. Pramanik
Flow-based particle separation usually requires a sheath flow for particle manipulation. Sheath fluid is a specialized buffer solution that directs the alignment of particles or cells into the center of the stream. By utilizing sheath flow, the particles or cells can be focused on the middle line of the microchannel, where they can be individually analyzed. However, the method requires an additional design for creating a suitable sheath flow.
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Nov 8, 2024 | 
pubs.aip.org | Crystal Owens |A-Man Zhang |R. Pramanik
This paper presents a hybrid numerical method for simulating the boiling heat transfer in particle-laden fluids. The coupled volume of fluid and level set method, immersed boundary method, and discrete element method are integrated for gas–liquid flow, fluid–solid interaction, and the collision between particles. The energy jump model is adopted to compute mass transfer during phase change.
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Nov 8, 2024 | 
pubs.aip.org | Dalian Maritime |Crystal Owens |A-Man Zhang |R. Pramanik
A series of two-dimensional flume experiments and Reynolds-averaged Navier–Stokes (RANS) simulations have been carried out to investigate the effects of bedform roughness on solitary wave propagation and its impact on the vertical wall in fringing reef profiles. Three water depths and four bedform roughness arrangements are taken into consideration to model different frictional fringing reef configurations.
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Nov 8, 2024 | 
pubs.aip.org | Power Engineering |Crystal Owens |A-Man Zhang |R. Pramanik
Due to the large-scale consumption of fossil fuels and the extensive emission of combustion gases, the greenhouse effect has intensified, with CO being one of the primary greenhouse gases causing severe environmental impacts. To address this issue, this paper investigates the flow and gas–liquid interface mass transfer behavior of CO bubbles in monoethanolamine solution through numerical simulations, validated by experimental data.
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Nov 5, 2024 | 
pubs.aip.org | Crystal Owens |A-Man Zhang |R. Pramanik
Structural morphing is regarded as a potential solution for future space transportation systems, necessitating aircraft capable of extensive altitude ranges, wide speed ranges, and multi-regime operations. The investigation of laminar-turbulent transition incorporating morphing effects aims to compensate for the lack of physical mechanisms in aircraft designs.
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Nov 1, 2024 | 
pubs.aip.org | Sun Yat-sen |Crystal Owens |A-Man Zhang |R. Pramanik
Flow reconstruction based on limited measurement data, which can be considered as a state estimation problem, constitutes a fundamental task within the realm of fluid mechanics. In recent years, the physics-informed neural networks (PINNs) have been proposed to achieve flow field reconstruction by integrating the measurements with governing equations during network training.
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Nov 1, 2024 | 
pubs.aip.org | Kansas City |Crystal Owens |A-Man Zhang |R. Pramanik
This study investigates the transport and deposition of small particles ( ) in a fully developed turbulent channel flow, focusing on two fluid friction Reynolds numbers: and . Using the point particle–direct numerical simulation method under the assumption of one-way coupling, we study how fluid flow (carrier phase) characteristics influence particle deposition.
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Oct 31, 2024 | 
pubs.aip.org | R. Pramanik |A-Man Zhang |Yinxiang Ma
When a shock wave crosses a density interface, the Richtmyer–Meshkov instability causes perturbations to grow. Richtmyer–Meshkov instabilities arise from the deposition of vorticity from the misaligned density and pressure gradients at the shock front. In many engineering applications, microscopic surface roughness will grow into multi-mode perturbations, inducing mixing between the fluid on either side of an initial interface.
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Oct 30, 2024 | 
pubs.aip.org | R. Pramanik |A-Man Zhang |Yinxiang Ma
Oil-in-water (O/W) emulsions are widely used in industrial production, food science, petrochemicals, and other fields. Quantitative measurement of the interaction between droplets is essential for the in-depth understanding of the stability mechanism of O/W emulsions. Optical tweezers are able to accurately and quantitatively measure the interaction forces between droplets in oil-in-water emulsion systems at the microscopic scale and offer numerous advantages.
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Oct 28, 2024 | 
pubs.aip.org | Shanghai Jiao Tong |Yinxiang Ma |A-Man Zhang |R. Pramanik
Acceleration of objects in fluids widely exists in biological propulsions and contains rich unsteady fluid mechanisms. In this paper, the instantaneous drag force on accelerating normal flat plates (circular, elliptical, square, and rectangular plates) in a wide range of dimensionless acceleration ( ) is measured, and the underlying mechanism for force generation is investigated.
