Investigating the boiling behavior of nanofluids remains a topic considerable research interest. The existing theoretical framework often underscores Brownian motion and thermophoresis among predominant mechanisms that influence nanoparticles' movement within nanofluids. However, most current numerical models addressing nanofluid either neglect these or incorporate them inadequately. A comprehensive review literature reveals two primary gaps. larger set studies on does not account for any...

Decay of secondary motion downstream 180° pipe bends is investigated using large-eddy simulations for the bend radii 1≤rB/dh≤3.375 at a Reynolds number Reh=10 000. The velocity and turbulence characteristics are validated against experimental data straight section as well direct numerical 90° bend. As radius decreases, larger magnitude intensity induced immediately bend, largest magnitude, highest gradient decay observed. result, recovery length needed to reestablish profile decreases....

This study presents the implementation and derivation of a Volume Fluid (VoF) solver capable taking into account pressure driven phase change handle three fluids. The implemented code is designed to investigate internal nozzle cavitation subsequent injection jet breakup. An extended model also that can in presence third phase. Detailed description mathematical system presented. validated on one-dimensional benchmark case from literature verified an experimentally well-documented geometry....

Designing a compact hydraulic pipe flocculator is common challenge for various water purification and wastewater processes where space limited. Various geometrical parameters are analysed to identify the most important when designing an efficient system Reynolds number of ReD = 20, 000. A coupled CFD-PBE model applied total 123 configurations simulate particle aggregation breakage due local velocity gradients in configurations. The shear present 90∘ bends dominating factor final aggregate...

Predicting the agglomeration and breakage of solid particles is important when designing a compact efficient water purification process. A coupled computational fluid dynamics model presented where population balance equation applied to track particle size distribution for periodic turbulent pipe flow with 180° bends Reynolds numbers 15,000<Ref<35,000 bend radii rB=dh,rB=1.5dh rB=2.5dh. The critical parameters in Euler-Euler are analysed values chosen describe soot based on an experimentally...

As the most mature technology within electrolysis field, alkaline electrolyzers are expected to play an important role in energetic transition. Advantages as their simplicity, modularity and low-cost components make it interesting for near future. However, fundamental physics complex includes multicomponent, multiphase flow, porous media, electrochemistry heat transfer. To have a better understanding of these phenomena, presented work is devoted development computational fluid dynamic model...

A numerical study is carried out to investigate heat transfer and friction argumentation in spirally corrugated tubes.28 geometrically different tubes are investigated cover a large set of corrugation characteristics.The pipes have pitch lengths l/D the range 0.5 2.0 heights h/D 0 0.16.Furthermore, flow conditions defined by Reynolds number for Re = 5000 10000, resulting total 56 Computational Fluid Dynamics (CFD) simulations .The performance exchangers evaluated based on Nusselt number,...

Hærvig, J., (2024). OpenTerrace: A fast, flexible and extendable Python framework for thermal energy storage packed bed simulations. Journal of Open Source Software, 9(98), 6411, https://doi.org/10.21105/joss.06411

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The formation of bubbles and their departure from a superheated horizontal surface is simulated in this paper. bubble nucleation occurs cylindrical cavity. simulation will be done by new OpenFOAM-based two phase solver. two-dimensional Taylor wave problem, which well-known benchmark for boiling phenomena, used to validate the model simulation. starts cavity growth created are simulated. dynamic, temperature, pressure distributions have been analyzed, demonstrating capability developed solver...

Wet electrostatic precipitators have demonstrated a robust capability for removal of particulate matter by minimizing back corona and particle re-entrainment fine particles. The absence studies investigating the black carbon particles using wet precipitator requires additional development/investigations. Among operational parameters precipitators, residence times (<1 s) amount energy transferred to exhaust gas are important determine efficiencies precipitators. This article reports...

The free fall trajectories of flat plates are investigated in order to improve understanding the forces acting on falling blunt objects. long term goal is develop a general applicable model predict trajectories. Numerically plate using six degrees freedom (6DOF) solver and dynamic mesh. To validate simulation, aluminium water recorded by digital camera recordings compared simulation. simulation able calculate motion within each time step with high accuracy, thereby allowing whole trajectory...