A novel combined model of discrete and mixture phases for nanoparticles in convective turbulent flow

Mahdavi, Mostafa; Sharifpur, Mohsen; Meyer, Josua P.

doi:10.1063/1.4998181

Cited by 14 publications

(11 citation statements)

References 48 publications

(26 reference statements)

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“…In addition, the transmission of respiratory droplets/particles/aerosols containing the virus under the action of jet fans is tracked by using the discrete phase model (DPM), which is a Lagrangian tracking approach. 58 …”

Section: Formulation Of the Jet Fan Flows In The Underground Car Parkmentioning

confidence: 99%

Jet fans in the underground car parking areas and virus transmission

et al. 2021

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Jet fans are increasingly preferred over traditional ducted systems as a means of ventilating pollutants in large environments such as underground car parks. The spread of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2)—which causes the novel coronavirus disease—through the jet fans in underground car parks has been considered a matter of key concern. A quantitative understanding of the propagation of respiratory droplets/particles/aerosols containing the virus is important. However, to date, studies have yet to demonstrate viral (e.g., SARS-CoV-2) transmission in underground car parks equipped with jet fans. In this paper, numerical simulation has been performed to assess the effects of jet fans on the spreading of viruses inside underground car parks.

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Section: Formulation Of the Jet Fan Flows In The Underground Car Parkmentioning

confidence: 99%

Jet fans in the underground car parking areas and virus transmission

et al. 2021

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“…The optimal horizontal tube pitch distance is between 0.25 and 0.5 of the tube diameter. Mahdavi et al 142 have used Brownian motion in the discrete phase (two‐phase) model for turbulent forced convective flow using nanofluids. This motion, along with thermophoresis and turbulent dispersion, is considered as a source term in the equations.…”

Section: Numerical Simulation In Two‐phase Heat Transfermentioning

confidence: 99%

Nanofluid in the multiphase flow field and heat transfer: A review

Dey

Sahu

2021

Heat Trans

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Two‐phase heat transfer is widely used in the heat transfer field, for example, condenser and evaporator in the refrigeration system, riser, and condenser in thermal power plants, and so on. The advantage of two‐phase heat transfer is that it gives a very‐high convective heat transfer coefficient compared to other modes of heat transfer. Nanofluid is a comparatively new heat transfer fluid and very popular because of its improved thermophysical properties. If nanofluid is used in a two‐phase heat transfer field, then the convective heat transfer coefficient may improve further. Nanofluids are possibly useful in many studies in two‐phase heat transfer like pool boiling heat transfer, flow boiling heat transfer, nanofluids in a microchannel, forced convective heat transfer, condensation, spray cooling, enhanced oil recovery, and so on. The effect of nanoparticles on wettability, contact angle, and nucleation sites are also reviewed in this paper. Numerical studies in two‐phase heat transfer are also reviewed and summarized in this paper. In this review, the chronological development of heat transfer in the two‐phase field is provided in a tabular form. This table covers a wide period starting Before Common Era ages until the recent addition of nanoparticles in the two‐phase heat transfer fluid.

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“…The numerical procedure for this model is as given by Mahdavi et al [75]; they first solved the flow and energy equations for the base fluid in the turbulent regime to convergence then solved discrete phase for one iteration with Brownian force and particle heat transfer equation with turbulent particle diffusivity calculated and stored. Then the particles concentration is stored and the gradient of temperature is calculated.…”

Section: A Combined Model Of Discrete and Mixture Phasesmentioning

confidence: 99%

“…Numerical investigation of forced convective heat transfer for water Al 2 O 3 nanofluid inside a circular tube under constant wall heat flux has been investigated by several researchers [6,32,36,43]. Furthermore, some researchers devised new models to simulate nanofluids based on their opinions on which phenomenon contributed more to the nanofluid's behavior [33,36,37,56,74,75]. Several models have been used to simulate nanofluids.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of single-phase, discrete, mixture and combined model of discrete and mixture phases in predicting nanofluid heat transfer characteristics for laminar and turbulent flow regimes

Onyiriuka

Obanor

Mahdavi

et al. 2018

Advanced Powder Technology

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It is essential to investigate the appropriate model for simulating nanofluid flow for different flow regimes because, at present, most previous studies do not agree with each other. It was, therefore, the purpose of this study to present a Computational Fluids Dynamics (CFD) investigation of heat transfer coefficients of internal forced convective flow of nanofluids in a circular tube subject to constant wall heat flux boundary conditions. A complete threedimensional (3D) cylindrical geometry was used. Laminar and turbulent flow regimes were considered. Three two-phase models (mixture model, discrete phase model (DPM) and the combined model of discrete and mixture phases) and the single-phase homogeneous model (SPM) were considered with both constant and variable properties. For the turbulent flow regime, it was found that the DPM with variable properties closely predicted the local heat transfer coefficients with an average deviation of 9%, and the SPM deviated from the DPM model by 2%. It was also found that the mixture and the combined discrete and the mixture phase model gave unrealistic results. For laminar flow, the DPM model with variable properties predicted the heat transfer coefficients with an average deviation of 9%.

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A novel combined model of discrete and mixture phases for nanoparticles in convective turbulent flow

Abstract: In this study, a new combined model presented to study the flow and discrete phase features of nano-size particles for turbulent convection in a horizontal tube. Due to the complexity and also many phenomena involved in particle-

Cited by 14 publications

References 48 publications

Jet fans in the underground car parking areas and virus transmission

Jet fans in the underground car parking areas and virus transmission

Nanofluid in the multiphase flow field and heat transfer: A review

Evaluation of single-phase, discrete, mixture and combined model of discrete and mixture phases in predicting nanofluid heat transfer characteristics for laminar and turbulent flow regimes

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