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Fluids, Volume 9, Issue 10

October 2024 - 24 articles

Cover Story: Reduced molecular collisions in microscale applications lead to unusual effects in homogeneous gaseous mixtures such as gas-phase separation. Using a modified lattice Boltzmann model with generalized slip boundary conditions coupled with a ray-tracing algorithm, this research investigates rarefied mixtures’ behaviour in 3D porous media. Transition flow regimes are simulated by incorporating the Knudsen diffusion effect as an external force. The model is validated with microchannel flow data, and the impact of porosity and gas mixture composition on gas separation is explored. The results show that gas separation increases with rarefaction and molecular mass ratio, and geometrical features in porous media significantly affect permeability in highly rarefied conditions. A permeability enhancement factor based on the lightest gas species is also derived. View this paper
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Articles (24)

  • Article
  • Open Access
1,189 Views
14 Pages

Traction on Rods within Cylinders Containing Grains: An Analogy with the Upward Movement of Trees in Tornadoes

  • Abel López Villa,
  • Josué Hernández-Juárez,
  • Abraham Medina,
  • Ronier Diez-Barroso and
  • Daniel Armando Serrano

3 October 2024

In this work, the frictional traction forces developing in the annular space between two concentric vertical cylinders consisting of the outer surface of a cylindrical rod and the inner sidewall of a wider circular cylinder will be analyzed. The expe...

  • Article
  • Open Access
1 Citations
1,077 Views
13 Pages

3 October 2024

This paper presents a fundamental study of electro-thermo-convective flows within a layer of dielectric liquid subjected to both an electric field and a thermal gradient. A low-conductivity liquid enclosed between two horizontal electrodes and subjec...

  • Article
  • Open Access
2,624 Views
27 Pages

Numerical Evaluation of the Effectiveness of the Use of Endplates in Front Wings in Formula One Cars under Multiple Track Operating Conditions

  • Aldo Saul Laguna-Canales,
  • Guillermo Urriolagoitia-Sosa,
  • Beatriz Romero-Ángeles,
  • Miguel Martinez-Mondragon,
  • Miguel Angel García-Laguna,
  • Reyner Iván Yparrea-Arreola,
  • Jonatan Mireles-Hernández,
  • Francisco Carrasco-Hernández,
  • Alejandro Urriolagoitia-Luna and
  • Guillermo Manuel Urriolagoitia-Calderón

3 October 2024

The last change in the technical regulations of Formula One that came into force in 2022 brought with it significant changes in the aerodynamics of the vehicle; among these, those made to the front wing stand out since the wing was changed to a more...

  • Article
  • Open Access
4 Citations
2,416 Views
23 Pages

Data Assimilation and Parameter Identification for Water Waves Using the Nonlinear Schrödinger Equation and Physics-Informed Neural Networks

  • Svenja Ehlers,
  • Niklas A. Wagner,
  • Annamaria Scherzl,
  • Marco Klein,
  • Norbert Hoffmann and
  • Merten Stender

1 October 2024

The measurement of deep water gravity wave elevations using in situ devices, such as wave gauges, typically yields spatially sparse data due to the deployment of a limited number of costly devices. This sparsity complicates the reconstruction of the...

  • Article
  • Open Access
929 Views
12 Pages

30 September 2024

In this study, we evaluated the nonlinear dynamics of convection flow using the thermodynamic variational principle, focusing on scenarios where multiple external forces, such as a thermal gradient and rotational field, are applied to a shallow annul...

  • Article
  • Open Access
1 Citations
1,504 Views
18 Pages

30 September 2024

The focus of this paper is the efficient numerical solution of the fluid flow in the Utah Frontier Observatory for Research in Geothermal Energy (FORGE) reservoir. In this study, the public data available for Discrete Fracture Networks (DFN) around w...

  • Article
  • Open Access
1,586 Views
22 Pages

30 September 2024

The present study explored the relationship between airborne transmission and the saliva fluid properties of a human sneeze. Specifically, we aimed to understand if altering the saliva and its relationship to droplet breakup and stability can affect...

  • Editorial
  • Open Access
1 Citations
1,179 Views
4 Pages

30 September 2024

Fluids is pleased to present a Special Issue named “Image-Based Computational and Experimental Biomedical Flows”, a curated collection of thirteen featured research papers that explore the integration between medical imaging data and 4-D...

  • Article
  • Open Access
2 Citations
1,340 Views
13 Pages

30 September 2024

Particle image velocimetry and particle tracking velocimetry (PTV) have developed from two-dimensional two-component (2D2C) velocity vector measurements to 3D3C measurements. Rainbow particle tracking velocimetry is a low-cost 3D3C measurement techni...

  • Article
  • Open Access
1 Citations
2,845 Views
15 Pages

Numerical Analysis of the Effect of Different Nose Shapes on Train Aerodynamic Performance

  • Paolo Schito,
  • Luigi Vigevano,
  • Stefano Negri,
  • Kerian Chauvin,
  • Gianluca Colavito and
  • Eric Landolfi

27 September 2024

This study investigates the aerodynamic performance of various trains with different nose shapes, using as the design variables two angles α,β for the head shape and the bluntness angle γ, without crosswind. The effects on aerodynami...

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Fluids - ISSN 2311-5521