H. Vahedi Tafreshi

ORCID: 0000-0003-0689-6621
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About
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Research Areas
  • Surface Modification and Superhydrophobicity
  • Aerosol Filtration and Electrostatic Precipitation
  • Lattice Boltzmann Simulation Studies
  • Fluid Dynamics and Heat Transfer
  • High voltage insulation and dielectric phenomena
  • Advanced Sensor and Energy Harvesting Materials
  • Textile materials and evaluations
  • Electrospun Nanofibers in Biomedical Applications
  • Adhesion, Friction, and Surface Interactions
  • Electrohydrodynamics and Fluid Dynamics
  • Cyclone Separators and Fluid Dynamics
  • Fluid Dynamics Simulations and Interactions
  • Particle Dynamics in Fluid Flows
  • Icing and De-icing Technologies
  • Radiative Heat Transfer Studies
  • Material Properties and Processing
  • Membrane Separation Technologies
  • Granular flow and fluidized beds
  • Aerodynamics and Fluid Dynamics Research
  • Fluid Dynamics and Thin Films
  • nanoparticles nucleation surface interactions
  • Aerogels and thermal insulation
  • Gas Dynamics and Kinetic Theory
  • Computer Graphics and Visualization Techniques
  • Material Dynamics and Properties

North Carolina State University
2005-2024

North Central State College
2023-2024

The Nonwovens Institute
2023-2024

Virginia Commonwealth University
2012-2021

University of Richmond
2018-2019

University of Milano-Bicocca
2001-2006

University of Milan
2004

Lappeenranta-Lahti University of Technology
1997-1998

University of Calgary
1998

Gas phase nanoparticle production, manipulation and deposition is of primary importance for the synthesis nanostructured materials development industrial processes based on nanotechnology. In this review we present discuss approach, introducing cluster sources, formation growth mechanisms use aerodynamic focusing methods that are coupled with supersonic expansions to obtain high intensity beams a control mass spatial distribution. The implication technique also presented applications highlighted.

10.1088/0022-3727/39/22/r02 article EN Journal of Physics D Applied Physics 2006-11-03

Previous studies have demonstrated the capability of superhydrophobic surfaces to produce slip flow and drag reduction, which properties hold considerable promise for a broad range applications. However, in order implement such practical utilizations, environmental factors as water movement over surface must be observed understood. In this work, experiments were carried out present proof-of-concept study on impact longevity polystyrene fibrous coatings. The time-dependent hydrophobicity...

10.1021/la301299e article EN Langmuir 2012-05-28

In this work, we study the influence of in-plane and through-plane fiber orientations on a fibrous medium’s transverse permeability. Three-dimensional virtual geometries resembling microstructure media with different are developed to be utilized in permeability calculations conducted by numerically solving Stokes equations void space between fibers. Results our simulations compared existing experimental analytical studies from literature excellent agreement is observed. We, particular,...

10.1063/1.3211192 article EN Physics of Fluids 2009-08-01

Previous studies dedicated to modeling drag reduction and stability of the air-water interface on superhydrophobic surfaces were conducted for microfabricated coatings produced by placing hydrophobic microposts/microridges arranged a flat surface in aligned or staggered configurations. In this paper, we model performance comprised randomly distributed roughness (e.g., particles microposts) that resembles natural surfaces, those via random deposition particles. Such fabrication method is far...

10.1063/1.3537833 article EN Physics of Fluids 2011-01-01

A mathematical framework is developed to predict the longevity of a submerged superhydrophobic surface made up parallel grooves. Time-dependent integro-differential equations predicting instantaneous behavior air–water interface are derived by applying balance forces across interface, while accounting for dissolution air in water over time. The calculations start producing differential equation initial steady-state shape and equilibrium position at t = 0. Analytical and/or numerical...

10.1063/1.4811830 article EN Physics of Fluids 2013-06-01

Prior studies have demonstrated that superhydrophobicity of submerged surfaces is influenced by hydrostatic pressure and other environmental effects. Sustainability a superhydrophobic surface could be characterized both how long it maintains the trapped air in its pores, so-called “longevity,” beyond which undergoes global wetting transition, “terminal pressure.” In this work, we investigate effects on performance electrospun polystyrene fibrous coatings. The time-dependent hydrophobicity...

10.1063/1.4766200 article EN Physics of Fluids 2012-11-01

10.1016/j.seppur.2017.02.049 article EN publisher-specific-oa Separation and Purification Technology 2017-02-27

Desalination of produced water in the gulf petrochemical industry is a continuing challenge to major research groups field. With focus on from desalination plants, it has become crucial define and follow specific protocol wastewater purification technologies. In this work, an optimized guideline for direct contact membrane distillation (DCMD) was developed implemented. A bench-scale DCMD unit performed under optimum process parameters feed inlet temperatures TFeed = 60 °C TDist 20 °C,...

10.1016/j.desal.2020.114663 article EN cc-by Desalination 2020-08-13

10.1016/j.cossms.2004.08.002 article EN Current Opinion in Solid State and Materials Science 2004-06-01
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