Mahshid Firouzi

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Evaluation of interfacial properties of concentrated KCl solutions by molecular dynamics simulation

Hong Peng, Mahshid Firouzi

Colloids and Surfaces A: Physicochemical and Engineering Aspects > 2018 > 538 > C > 703-710

Understanding the interfacial properties of concentrated salt solutions is critical for various applications in physical, chemical and biological processes. This study aims to evaluate the interfacial properties of potassium chloride (KCl) solutions with concentrations ranging from 1 to 4M using the molecular dynamics simulation technique. We used two different water models, TIP4P/2005 and SPC/E to...

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A critical review of flow maps for gas-liquid flows in vertical pipes and annuli

Benjamin Wu, Mahshid Firouzi, Travis Mitchell, Thomas E. Rufford, more

Chemical Engineering Journal > 2017 > 326 > C > 350-377

The accurate prediction of two-phase gas and liquid flow regimes is important in the proper design, operation and scale-up of pressure management and fluid handling systems in a wide range of industrial processes. This paper provides a comprehensive review of 3947 published experimental data points for gas-liquid flow maps in vertical pipes and annuli, including a critical analysis of state-of-the-art...

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The Gibbs-Marangoni stress and nonDLVO forces are equally important for modeling bubble coalescence in salt solutions

Mahshid Firouzi, Anh V. Nguyen

Colloids and Surfaces A: Physicochemical and Engineering Aspects > 2017 > 515 > C > 62-68

Some salts can inhibit bubble coalescence above a critical concentration. The initial models for prediciting the critical salt concentrations were developed based on the effects of the Gibbs-Marangoni stress and either the London-van der Waals or Casimir-van der Waals attraction on the drainage and rupture of thin liquid films between bubbles. The later models considered only the Gibbs-Marangoni stress...

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Spontaneous Imbibition Experiments of Enhanced Oil Recovery with Surfactants and Complex Nano-Fluids

Brian F. Towler, Heidi L. Lehr, Scott W. Austin, Brooks Bowthorpe, more

Journal of Surfactants and Detergents > 2017 > 20 > 2 > 367-377

Two types of porous media were analyzed with the intention of exploring alternative enhanced oil recovery methods. Core samples were taken from the Tensleep Formation of the Black Mountain Field in Hot Springs County, WY. The lithology is mainly sandstone and dolomite. The measured effective porosity values ranged from 13.0 to 18.0%, and permeabilities from 19 to 68 md. Production from the Tensleep...

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Developing new mechanistic models for predicting pressure gradient in coal bed methane wells

Mahshid Firouzi, Brian Towler, Thomas E. Rufford

Journal of Natural Gas Science and Engineering > 2016 > 33 > C > 961-972

A range of mathematical models and correlations is used to estimate the pressure drop of coal bed methane (CBM) or coal seam gas (CSG) wells. These correlations were originally developed for co-current two-phase flows in conventional wells in the oil and gas industry. However, the upward flow of gas and downward flow of water in the annulus between casing and tubing of a CSG well results in counter-current...

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An overview of the coal seam gas developments in Queensland

Brian Towler, Mahshid Firouzi, James Underschultz, Will Rifkin, more

Journal of Natural Gas Science and Engineering > 2016 > 31 > C > 249-271

The demand for natural gas in Queensland, Australia has historically been supplied from conventional reservoirs. However, depletion in conventional sources has led producers to turn to extensive supplies in Queensland's coal resources. These coal seam gas (CSG) developments not only represent new supplies for the domestic market in eastern Australia, they are also the first time that CSG (aka coal...

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A quantitative review of the transition salt concentration for inhibiting bubble coalescence

Mahshid Firouzi, Tony Howes, Anh V. Nguyen

Advances in Colloid and Interface Science > 2015 > 222 > Complete > 305-318

Some salts have been proven to inhibit bubble coalescence above a certain concentration called the transition concentration. The transition concentration of salts has been investigated and determined by using different techniques. Different mechanisms have also been proposed to explain the stabilizing effect of salts on bubble coalescence. However, as yet there is no consensus on a mechanism which...

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Effects of monovalent anions and cations on drainage and lifetime of foam films at different interface approach speeds

Mahshid Firouzi, Anh V. Nguyen

Advanced Powder Technology > 2014 > 25 > 4 > 1212-1219

Ions of inorganic salts are known to affect bubble coalescence via ion size, charge density and polarizability. In this paper, a systematic study of the effect of monovalent anions (F ⁻ , Cl ⁻ , Br ⁻ and I ⁻ ) and cations (Li ⁺ , Na ⁺ and K ⁺ ) on the lifetime of liquid films between two bubble surfaces is carried out by applying the thin film...

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On the effect of van der Waals attractions on the critical salt concentration for inhibiting bubble coalescence

Mahshid Firouzi, Anh V. Nguyen

Minerals Engineering > 2014 > 58 > Complete > 108-112

The coalescence of gas bubbles in many salt solutions such as NaCl is significantly inhibited if the salt concentration exceeds a critical concentration which is unique for each salt. It has been predicted as a function of the Hamaker constants of van der Waals attractions between two bubbles. In this paper, the Lifshitz theory on the van der Waals interaction energy and the available spectrum for...

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The effect of microhydrodynamics on bubble–particle collision interaction

Mahshid Firouzi, Anh V. Nguyen, Seyyed Hassan Hashemabadi

Minerals Engineering > 2011 > 24 > 9 > 973-986

Interactions between particles and bubbles are influenced by hydrodynamic forces of the aqueous medium in which the flotation process takes place. This paper investigates the effect of liquid hydrodynamic forces working at short inter-surface separation distance, referred to as microhydrodynamic forces, on the bubble–particle collision (encounter) interaction. The full equation of particle motion...

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Search results for: Mahshid Firouzi

Evaluation of interfacial properties of concentrated KCl solutions by molecular dynamics simulation

A critical review of flow maps for gas-liquid flows in vertical pipes and annuli

The Gibbs-Marangoni stress and nonDLVO forces are equally important for modeling bubble coalescence in salt solutions

Spontaneous Imbibition Experiments of Enhanced Oil Recovery with Surfactants and Complex Nano-Fluids

Developing new mechanistic models for predicting pressure gradient in coal bed methane wells

An overview of the coal seam gas developments in Queensland

A quantitative review of the transition salt concentration for inhibiting bubble coalescence

Effects of monovalent anions and cations on drainage and lifetime of foam films at different interface approach speeds

On the effect of van der Waals attractions on the critical salt concentration for inhibiting bubble coalescence

The effect of microhydrodynamics on bubble–particle collision interaction

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