Search results for: Hamid Niazmand

Items from 1 to 20 out of 26 results

article

Effect of sonication time on the evaporation rate of seawater containing a nanocomposite

Mohammad Mustafa Ghafurian, Zohreh Akbari, Hamid Niazmand, Roya Mehrkhah, more

Ultrasonics Sonochemistry > 2020 > 61 > C

Sonication time has a significant contribution to the stability and properties of nanofluids (mixtures of nanoparticles and a base fluid). Finding the optimum sonication time can help to save energy and ensure optimal design. The present study deals with the sonication time effect on the evaporation rate of seawater containing a nanocomposite (i.e., a mixture of multi-walled carbon nanotubes and graphene...

article

An Alternative High-Density Ratio Pseudo-potential Lattice Boltzmann Model with Surface Tension Adjustment Capability

Soroush Fallah Kharmiani, Hamid Niazmand, Mohammad Passandideh-Fard

Journal of Statistical Physics > 2019 > 175 > 1 > 47-70

In this paper, an alternative model is presented to simultaneously achieve thermodynamic consistency, leading to high-density ratios, and surface tension adjustment capability based on the pseudo-potential lattice Boltzmann model (LBM). These features are achieved by adding two relatively simple terms, each with an adjustable coefficient, selected from the Taylor expansion of the original interaction...

article

Thermal management of a distribution transformer: An optimization study of the cooling system using CFD and response surface methodology

Leyla Raeisian, Hamid Niazmand, Ehsan Ebrahimnia-Bajestan, Peter Werle

International Journal of Electrical Power & Energy Systems > 2019 > 104 > C > 443-455

In this paper, a numerical scheme has been developed to examine the effective parameters on thermal management of distribution transformers and subsequently to optimize their cooling systems. In this regard, the response surface methodology (RSM) was used as the optimization method to minimize the hotspot temperature in the transformer as the response factor. A comprehensive three-dimensional computational...

article

Localized solar heating via graphene oxide nanofluid for direct steam generation

Mohammad Mustafa Ghafurian, Hamid Niazmand, Ehsan Ebrahimnia-Bajestan, Hamed Elhami Nik

Journal of Thermal Analysis and Calorimetry > 2019 > 135 > 2 > 1443-1449

In the present paper, the performance of the graphene oxide in the solar steam generation has experimentally been examined. For this purpose, a setup was built for measuring the evaporation rate, which consists of a solar simulator with a xenon lamp as a radiation source, a pyranometer for light intensity measuring, and a sensory system for measuring the temperature and the mass. Then, the nanofluid...

article

New approach for estimating the cooling capacity of the absorption and compression chillers in a trigeneration system

Mohammad Mustafa Ghafurian, Hamid Niazmand

International Journal of Refrigeration > 2018 > 86 > C > 89-106

This paper presents a multi-objective optimization model for estimating the cooling capacity of refrigeration in a trigeneration system for both grid on and off operating modes. In trigeneration systems, the cooling demand can be provided by single effect absorption and compression chillers (as the refrigeration system). Genetic Algorithm and LINMAP selection procedure are used for obtaining the final...

article

Simulation of a single droplet impact onto a thin liquid film using the lattice Boltzmann method

Soroush Fallah Kharmiani, Mohammad Passandideh-Fard, Hamid Niazmand

Journal of Molecular Liquids > 2016 > 222 > C > 1172-1182

In this paper, a single-component multiphase pseudo-potential lattice Boltzmann model is developed to study droplet impact onto a thin liquid film in 2D coordinates. The model has certain capabilities which make it applicable to cases with large density ratios as high as 1000, low viscosities, and tunable values of surface tension independent of the density ratio. The coexistence values (densities)...

article

Nanofluid flow and heat transfer in a microchannel with longitudinal vortex generators: Two-phase numerical simulation

Amin Sabaghan, Mojtaba Edalatpour, Mohammad Charjouei Moghadam, Ehsan Roohi, more

Applied Thermal Engineering > 2016 > 100 > C > 179-189

Here we report a comprehensive numerical procedure based on the two-phase approach to simulate a rectangular microchannel consisting of six longitudinal vortex generators (LVGs). Nanofluids are used to remove heat generated within the microchannel. The simulations performed in this paper are based on the newest version of the two-phase Eulerian–Eulerian approach. The TiO₂-based nanofluids with different...

article

Experimental and numerical investigation of nanofluids heat transfer characteristics for application in solar heat exchangers

Ehsan Ebrahimnia-Bajestan, Mohammad Charjouei Moghadam, Hamid Niazmand, Weerapun Daungthongsuk, more

International Journal of Heat and Mass Transfer > 2016 > 92 > C > 1041-1052

One of the innovative methods of improving heat transfer characteristics of heat exchangers in solar systems is applying nanofluids as the heat transfer media. In this study, laminar convective heat transfer of water-based TiO₂ nanofluid flowing through a uniformly heated tube has been investigated via experiments and numerical modeling. The thermal conductivity and dynamic viscosity of the prepared...

article

Analysis of flow and LDL concentration polarization in siphon of internal carotid artery: Non-Newtonian effects

Alireza Sharifi, Hamid Niazmand

Computers in Biology and Medicine > 2015 > 65 > Complete > 93-102

Carotid siphon is known as one of the risky sites among the human intracranial arteries, which is prone to formation of atherosclerotic lesions. Indeed, scientists believe that accumulation of low density lipoprotein (LDL) inside the lumen is the major cause of atherosclerosis. To this aim, three types of internal carotid artery (ICA) siphon have been constructed to examine variations of hemodynamic...

article

Low-density lipoprotein accumulation within a carotid artery with multilayer elastic porous wall: fluid–structure interaction and non-Newtonian considerations

Amin Deyranlou, Hamid Niazmand, Mahmood-Reza Sadeghi

Journal of Biomechanics > 2015 > 48 > 12 > 2948-2959

Low-density lipoprotein (LDL), which is recognized as bad cholesterol, typically has been regarded as a main cause of atherosclerosis. LDL infiltration across arterial wall and subsequent formation of Ox-LDL could lead to atherogenesis. In the present study, combined effects of non-Newtonian fluid behavior and fluid–structure interaction (FSI) on LDL mass transfer inside an artery and through its...

article

Numerical simulation of the tumor interstitial fluid transport: Consideration of drug delivery mechanism

Mohammad Charjouei Moghadam, Amin Deyranlou, Alireza Sharifi, Hamid Niazmand

Microvascular Research > 2015 > 101 > Complete > 62-71

The interstitial fluid transport plays an important role in terms of its effect on the delivery of therapeutic agents to the cancerous organs. In this study, a comprehensive numerical simulation of the interstitial fluid transport establishing 3D models of tumor and normal tissue is accomplished. Different shapes of solid tumors and their surrounding normal tissues are selected, by employing the porous...

article

Experimental investigation on the thermal efficiency and performance characteristics of a flat plate solar collector using SiO2/EG–water nanofluids

Saleh Salavati Meibodi, Ali Kianifar, Hamid Niazmand, Omid Mahian, more

International Communications in Heat and Mass Transfer > 2015 > 65 > Complete > 71-75

Application of nanofluids in thermal energy devices such as solar collectors is developing day by day. This paper reports the results of experiments on a flat plate solar collector where the working fluid is SiO ₂ /ethylene glycol (EG)–water nanofluid with volume fractions up to 1%. The thermal efficiency and performance characteristics of solar collector are obtained for mass flow rates between...

article

DSMC simulation of micro/nano flows using SBT–TAS technique

Ali Amiri-Jaghargh, Ehsan Roohi, Stefan Stefanov, Hassan Nami, more

Computers and Fluids > 2014 > 102 > Complete > 266-276

The aim of the current work is to suggest a combination of the simplified Bernoulli-trials (SBT) collision algorithm with the transient adaptive subcell (TAS) technique implemented in the direct simulation Monte Carlo (DSMC) for calculation of non-equilibrium gas flows with reduced computational resources. In this work, we demonstrate that the use of the SBT collision scheme together with the TAS...

article

Numerical Simulation of Electroosmotic Flow in Flat Microchannels with Lattice Boltzmann Method

Omid Reza Mohammadipoor, Hamid Niazmand, Seyed Ali Mirbozorgi

Arabian Journal for Science and Engineering > 2014 > 39 > 2 > 1291-1302

In the present work, a new Lattice Boltzmann model has been developed to study the electroosmotic flows in a 2-D flat microchannel. The governing equations are presented in the continuum model, while a set of equivalent equations in Lattice Boltzmann model is introduced and solved numerically. In particular, the Poisson and the Nernst–Planck (NP) equations are solved by two new lattice evolution methods...

article

Effects of particle diameter on performance improvement of adsorption systems

Hamid Niazmand, Hoda Talebian, Mehdi Mahdavikhah

Applied Thermal Engineering > 2013 > 59 > 1-2 > 243-252

The adsorbent particle diameter is an influential parameter in the performance of an adsorption chiller since it affects both inter- and intra-particle mass transfer resistances. In this analysis, a plate finned-tube heat exchanger is considered with SWS-1L (CaCl ₂ in mesoporous silica gel) and water as the working pair to investigate the particle diameter effects on the performance parameters...

article

Effects of plate finned heat exchanger parameters on the adsorption chiller performance

Mehdi Mahdavikhah, Hamid Niazmand

Applied Thermal Engineering > 2013 > 50 > 1 > 939-949

In this paper the performance of an adsorption chiller working with water and the composite sorbent SWS-1L known for high coefficient of performance (COP) in unites driven by low temperature heat has been examined. A three-dimensional non-equilibrium numerical model describing the combined heat and mass transfer in an adsorbent bed with plate fins is presented. The spatial variations of pressure and...

article

Experimental study of argon dilution effects on NO_x emission in a non-premixed flame in comparison with nitrogen

Abdolrasoul Rangrazi, Hamid Niazmand, Hamid Momahedi Heravi

Korean Journal of Chemical Engineering > 2013 > 30 > 8 > 1588-1593

The effects of nitrogen and argon dilution on NO_X emission of turbulent propane-air non-premixed flame in a furnace are experimentally investigated. Dilution is an effective process in reducing NO_X emission, since diluents cause an increase in the mass flow of the fuel, and consequently the temperature in the combustion chamber and NO_X emission decreases. We measured NO_X emission and temperature...

article

Bed geometrical specifications effects on the performance of silica/water adsorption chillers

Hamid Niazmand, Hoda Talebian, Mehdi Mahdavikhah

International Journal of Refrigeration > 2012 > 35 > 8 > 2261-2274

A transient three-dimensional numerical scheme considering both inter-particle and intra-particle mass transfer resistances is developed to examine the performance of silica gel/water adsorption chiller. The developed model is validated against the available experimental data in literature. The effects of bed contact resistance and variable thermal conductivity are examined and moreover, it is shown...

article

A novel approach for determining thermal properties of single-walled carbon nanotubes

Massoud Mir, Ehsan Ebrahimnia-Bajestan, Hamid Niazmand, Mahdi Mir

Computational Materials Science > 2012 > 63 > Complete > 52-57

In this paper, a continuum model is presented to investigate the thermal properties of carbon nanotubes (CNTs). The proposed model considers each carbon–carbon (C–C) bond in CNT as a continuum solid element. The thermal properties of the CNTs can be calculated simply by computing the thermal properties of these solid elements. Considering a thermal resistance for each continuum solid element (C–C...

article

Particle Tracking Based Method for Evaluation of Cylinder‐to‐Cylinder Distribution of EGR/Blowby

Peyman Bashi Shahabi, Hamid Niazmand, Mohammad Reza Modarres Razavi

Particle & Particle Systems Characterization > 29 > 4 > 253 - 262

Exhaust Gas Recirculation (EGR) method has already shown its benefits on controlling NO_x emissions in internal combustion engines. An important issue associated with this method is homogeneous cylinder‐to‐cylinder distribution of the recirculating gas. Any maldistribution leads to power reduction and increase of other pollutants, which are strictly limited by recent emission laws. In addition to EGR,...

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Keywords

NANOFLUID (4)
ADSORPTION CHILLER (3)
HEAT TRANSFER (2)
LATTICE BOLTZMANN METHOD (2)
MASS TRANSFER (2)
MICROCHANNEL (2)
NANOFLUIDS (2)
NON-NEWTONIAN (2)
THERMAL CONDUCTIVITY (2)
ADSORBANT (1)
ADSORBENT (1)
ADSORBENT HEAT EXCHANGER (1)
ADSORPTION (1)
ANNULAR FINNED BED (1)
ARGON (1)
BED CONFIGURATION (1)
BLOOD HEMODYNAMICS (1)
BLOWBY (1)
BUFFER RESERVOIR (1)
CARBON NANOTUBES (1)
CASCADE RESERVOIR (1)
CHIRALITY (1)
COMPOSITE NANOFLUID (1)
COMPUTATIONAL MODELING (1)
CONFIGURATION DU LIT (1)
CONTINUUM MODEL (1)
CONVECTIVE HEAT TRANSFER (1)
CYLINDER‐TO‐CYLINDER MALDISTRIBUTION (1)
DESORPTION (1)
DILUTION (1)
DRAG COEFFICIENT (1)
DROPLET IMPACT (1)
DRUG DELIVERY (1)
DSMC (1)
DÉSORPTION (1)
EGR (1)
ELECTROOSMOTIC FLOW (1)
ENTRANCE REGION (1)
ENTROPY GENERATION (1)
EXPERIMENTAL STUDY (1)
EXTENDED SURFACE (1)
FAST-FILLING PROCESS (1)
FINED BED (1)
FINNED BED (1)
FLAT PLATE SOLAR COLLECTOR (1)
FLUID–STRUCTURE INTERACTION (1)
FRICTION COEFFICIENT (1)
GAS ENGINE (1)
GRAPHENE OXIDE (1)
HEAT TRANSFER COEFFICIENT (1)
HEAT TRANSFER ENHANCEMENT (1)
HEAT TRANSFER PERFORMANCE (1)
HIGH-DENSITY RATIO (1)
HOTSPOT (1)
HYDROGEN FUELLING STATION (1)
INTERNAL CAROTID ARTERY (1)
INTERSTITIAL FLUID TRANSPORT (1)
LIT À AILETTES ANNULAIRES (1)
LIT À AILETTES CARRÉES (1)
LONGITUDINAL VORTEX GENERATORS (1)
LOW-DENSITY LIPOPROTEIN (1)
LOW-DENSITY LIPOPROTEIN TRANSPORT (1)
MASS TRANSFER RESISTANCE (1)
MEMORY REDUCTION (1)
MICRO/NANO FLOWS (1)
MILIEU POREUX (1)
MULTI-PHASE (1)
MULTILAYER MODEL (1)
MULTIPHASE (1)
NERNST–PLANCK EQUATIONS (1)
NET FUTURE WORTH BENEFIT DIFFERENCE (NFWBD) (1)
NITROGEN (1)
NO X (1)
NON-PREMIXED (1)
NUMERICAL MODELLING (1)
NUMERICAL STUDY (1)
OPTIMIZATION (1)
PARTICLE DIAMETER (1)
PARTICLE TRACKING (1)
PECLET NUMBER (1)
PERFORMANCE CHARACTERISTICS (1)
POROUS MEDIA (1)
POROUS MEDIUM (1)
PRESSURE DROP (1)
PROPANE (1)
PSEUDO-POTENTIAL (1)
PSEUDO-POTENTIAL LBM (1)
RAREFACTION (1)
RAREFIED FLOW (1)
REFROIDISSEUR À ADSORPTION (1)
RESPONSE SURFACE METHOD (1)
ROTATING DROPLET (1)
SIMPLIFIED BERNOULLI-TRIALS (SBT) SCHEME (1)
SLIP (1)
SLIP-FLOW (1)
SOLAR EVAPORATION (1)
SOLAR SIMULATOR (1)
SOLAR STEAM GENERATION (1)
SOLAR SYSTEMS (1)
SPECIFIC COOLING POWER (1)
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Elsevier (20)
Springer (5)
Wiley (1)

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Search results for: Hamid Niazmand

Effect of sonication time on the evaporation rate of seawater containing a nanocomposite

An Alternative High-Density Ratio Pseudo-potential Lattice Boltzmann Model with Surface Tension Adjustment Capability

Thermal management of a distribution transformer: An optimization study of the cooling system using CFD and response surface methodology

Localized solar heating via graphene oxide nanofluid for direct steam generation

New approach for estimating the cooling capacity of the absorption and compression chillers in a trigeneration system

Simulation of a single droplet impact onto a thin liquid film using the lattice Boltzmann method

Nanofluid flow and heat transfer in a microchannel with longitudinal vortex generators: Two-phase numerical simulation

Experimental and numerical investigation of nanofluids heat transfer characteristics for application in solar heat exchangers

Analysis of flow and LDL concentration polarization in siphon of internal carotid artery: Non-Newtonian effects

Low-density lipoprotein accumulation within a carotid artery with multilayer elastic porous wall: fluid–structure interaction and non-Newtonian considerations

Numerical simulation of the tumor interstitial fluid transport: Consideration of drug delivery mechanism

Experimental investigation on the thermal efficiency and performance characteristics of a flat plate solar collector using SiO2/EG–water nanofluids

DSMC simulation of micro/nano flows using SBT–TAS technique

Numerical Simulation of Electroosmotic Flow in Flat Microchannels with Lattice Boltzmann Method

Effects of particle diameter on performance improvement of adsorption systems

Effects of plate finned heat exchanger parameters on the adsorption chiller performance

Experimental study of argon dilution effects on NO_x emission in a non-premixed flame in comparison with nitrogen

Bed geometrical specifications effects on the performance of silica/water adsorption chillers

A novel approach for determining thermal properties of single-walled carbon nanotubes

Particle Tracking Based Method for Evaluation of Cylinder‐to‐Cylinder Distribution of EGR/Blowby

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