Similarity and numerical analysis of the generalized Levèque problem to predict the thermal boundary layer

Belhocine, Ali; Abdullah, Oday I.

doi:10.1007/s12008-017-0434-8

Cited by 20 publications

(5 citation statements)

References 22 publications

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“…Complicated secondary flows (Briley & McDonald, 1984 ), the local vorticity creation at the ridges, and other detailed features cannot be captured by the Q3D model. Similarly, other complicated phenomena like the aerothermal effects (Belhocine & Omar, 2018 ), analyses of thermal/fluid boundary layers (Belhocine & Oday, 2015 ; Belhocine, 2016 ), effects of wall heating (Belhocine, 2017 ), effects of convective heat transfer (Belhocine & Omar, 2017 ), thermal-turbulent interactions (Belhocine & Oday, 2019 ), and effect of friction (Belhocine & Oday, 2020 ) can be modeled only using detailed CFD models, as demonstrated by Belhocine and his colleagues. However, the Q3D method can accurately predict fluid pressures and provide accurate transport effects.…”

Section: Methodsmentioning

confidence: 99%

A quasi-3D model of the whole lung: airway extension to the tracheobronchial limit using the constrained constructive optimization and alveolar modeling, using a sac–trumpet model

Kannan

Singh

Przekwas

et al. 2021

Journal of Computational Design and Engineering

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Existing computational models used for simulating the flow and species transport in the human airways are zero-dimensional (0D) compartmental, three-dimensional (3D) computational fluid dynamics (CFD), or the recently developed quasi-3D (Q3D) models. Unlike compartmental models, the full CFD and Q3D models are physiologically and anatomically consistent in the mouth and the upper airways, since the starting point of these models is the mouth–lung surface geometry, typically created from computed tomography (CT) scans. However, the current resolution of CT scans limits the airway detection between the 3rd–4th and 7th–9th generations. Consequently, CFD and the Q3D models developed using these scans are generally limited to these generations. In this study, we developed a method to extend the conducting airways from the end of the truncated Q3D lung to the tracheobronchial (TB) limit. We grew the lung generations within the closed lung lobes using the modified constrained constructive optimization, creating an aerodynamically optimized network aiming to produce equal pressure at the distal ends of the terminal segments. This resulted in a TB volume and lateral area of ∼165 cc and ∼2000 cm2, respectively. We created a “sac–trumpet” model at each of the TB outlets to represent the alveoli. The volumes of the airways and the individual alveolar generations match the anatomical values by design: with the functional residual capacity at 2611 cc. Lateral surface areas were scaled to match the physiological values. These generated Q3D whole lung models can be efficiently used for conducting multiple breathing cycles of drug transport and deposition simulations.

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Section: Methodsmentioning

confidence: 99%

A quasi-3D model of the whole lung: airway extension to the tracheobronchial limit using the constrained constructive optimization and alveolar modeling, using a sac–trumpet model

Kannan

Singh

Przekwas

et al. 2021

Journal of Computational Design and Engineering

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“…The heat transfer coefficient, was an important amount utilized in the calculation of heat transfer, usually used once there was a phase change between a fluid and a solid, or convection. The coefficient was not a property like specific heat or thermal conductivity, however rather a descriptive amount based mostly on fluids interacting with geometries [ 6 ].…”

Section: Introductionmentioning

confidence: 99%

The surfactants effect on the heat transfer enhancement and stability of nanofluid at constant wall temperature

Askar

Kadhim

Mshehid

2020

Heliyon

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Surfactants role in the enhancement of the heat transfer and stability of alumina oxide – distilled water nanofluid was introduced in this research, where there are limited studies that conjugate between the stability improvement and its effect on the heat transfer coefficients. Four weight concentrations for the experiment were used (0.1, 0.3, 0.6, and 0.9%) with 20 nm particle size under a constant wall temperature. The selection of appropriate surfactants weight was tested too by implementing three weight concentrations (0.5, 1, 1.5, and 2 %) related to each nanofluid concentration via measuring their effect on the zeta potential value. The heat transfer augmentation was tested through a double horizontal pipe under a constant wall temperature at entrance region with Reynolds number range (4000–11800). The results manifested the use of nanofluid worked on enhancement the heat transfer performance better than water, and the stable nanofluid elucidated better results.

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“…The thermal boundary layer analysis for modified Leve`que problem has been performed by Belhocine and Abdullah. 50 Joule heating appears due to the resistance offered to electric current passing through some conductive material. There are number of systems in which Joule heating effect has vital role such as dielectrophoretic trapping, electric fuses, PCR reactors, hot plate, microvalves for fluid control, electric heaters and stoves, thermistors and soldering irons, etc.…”

Section: Introductionmentioning

confidence: 99%

Heat and mass transfer characteristics in flow of bi-viscosity fluid through a curved channel with contracting and expanding walls: A finite difference approach

Ahmed

Ali

Khan

et al. 2020

Advances in Mechanical Engineering

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This article investigates the heat and mass transfer in flow of bi-viscosity fluid through a porous saturated curved channel with sinusoidally deformed walls. The magnetic field and Joule heating effects are also taken into account. The equations describing the flow and heat/mass transfer are developed using curvilinear coordinates. A reduction of these equations is made based on lubrication approximation. The reduced linear ordinary differential equations are integrated numerically using an implicit finite difference scheme. It is observed that, the bi-viscosity fluid parameter, permeability parameter, and Hartmann number have analogous effects on the longitudinal velocity. Moreover, temperature of the fluid, heat coefficient, and mass concentration increase by increasing bi-viscosity fluid parameter, Brinkmann number, and Hartmann number. Further, mass concentration increases by increasing the rate of chemical reaction and bi-viscosity parameter. The size of circulating roll in lower half of the channel boosts up with larger variation of bi-viscosity parameter and permeability parameter. The flow patterns in the channel illustrating the effects of bi-viscosity parameter, permeability parameter, and Hartmann number are also displayed.

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Similarity and numerical analysis of the generalized Levèque problem to predict the thermal boundary layer

Cited by 20 publications

References 22 publications

A quasi-3D model of the whole lung: airway extension to the tracheobronchial limit using the constrained constructive optimization and alveolar modeling, using a sac–trumpet model

A quasi-3D model of the whole lung: airway extension to the tracheobronchial limit using the constrained constructive optimization and alveolar modeling, using a sac–trumpet model

The surfactants effect on the heat transfer enhancement and stability of nanofluid at constant wall temperature

Heat and mass transfer characteristics in flow of bi-viscosity fluid through a curved channel with contracting and expanding walls: A finite difference approach

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