Abdelkader Baayoun

Abdelkader Baayoun

Western University

H-index: 3

North America-Canada

Professor Information

University

Western University

Position

PhD candidate

Citations(all)

63

Citations(since 2020)

63

Cited By

14

hIndex(all)

3

hIndex(since 2020)

3

i10Index(all)

2

i10Index(since 2020)

2

Email

University Profile Page

Western University

Research & Interests List

Fluid mechanics

Heat transfer

Pollution modeling

Top articles of Abdelkader Baayoun

The characteristics of the circular hydraulic jump and vortex structure

In an effort to capture the continuous hydraulic jump and flow structure for a jet impinging on a disk, we recently proposed a composite mean-field thin-film approach consisting of subdividing the flow domain into three distinct connected regions of increasing gravity strength (Wang et al., J. Fluid Mech., vol. 966, 2023, A15). In the present study, we further validate our approach, and examine the characteristics and structure of the circular jump and recirculation. The influence of the disk radius is found to be significant, especially in the subcritical region. Below a disk radius, the jump transits from type Ia to type 0 after the recirculation zone has faded. The supercritical flow and jump location are insensitive to the disk size, but the jump length and height as well as the vortex size are strongly affected, all decreasing with decreasing disk radius, exhibiting a maximum with the flow rate for a small disk. The jump is relatively …

Authors

Wenxi Wang,Abdelkader Baayoun,Roger E Khayat

Journal

Journal of Fluid Mechanics

Published Date

2024/2

A coherent composite approach for the continuous circular hydraulic jump and vortex structure

We examine the structure of the continuous circular hydraulic jump and recirculation for a jet impinging on a disk. We use a composite mean-field thin-film approach consisting of subdividing the flow domain into three regions of increasing gravity strength: a developing boundary layer near impact, an intermediate supercritical viscous layer and a region comprising the jump and subcritical flow. Unlike existing models, the approach does not require any empirically or numerically adjusted boundary conditions. We demonstrate that the stress or corner singularity for a film draining at the edge is equivalent to an infinite slope of the film surface, which we impose as the downstream boundary condition. The model is validated against existing experiment and numerical simulation of the boundary-layer and Navier–Stokes equations. We find that the flow in the supercritical region remains insensitive to the change in gravity …

Authors

Wenxi Wang,Abdelkader Baayoun,Roger E Khayat

Journal

Journal of Fluid Mechanics

Published Date

2023/7

Interplay of Forces in Impinging Jet Flow and Circular Hydraulic Jump

The circular liquid jet impingement with subsequent hydraulic jump formation is studied theoretically using boundary-layer and thin-film approaches. Three different scenarios are tackled, namely, an accelerated Newtonian jet impinging on a stationary disk, a steady Newtonian jet impinging on a rotating disk, and a steady viscoelastic liquid jet impinging on a stationary disk. Accordingly, the effects of jet acceleration, gravity, centrifugal forces, and fluid elasticity on the flow behaviour and the jump are examined. The results are validated against numerical simulation and existing measurements. The findings show that the thickness of the boundary layer developing near impingement diminishes with jet acceleration but remains unaffected by centrifugal forces, aligning with previous findings in rotating boundary-layer flows. On the other hand, the film thickness increases with jet acceleration and disk rotation but decreases with fluid elasticity. For a jet velocity that increases linearly with time, the jump radius and conjugate depths increase over time, but their evolution is predominantly linear only at later times. The flow responds to the jet acceleration quasi-steadily near impingement but exhibits a long-term transient behaviour near the jump after the acceleration is halted. In the case of a rotating disk, two flow regimes are identified. The first regime corresponds to weak disk rotation characterized by the formation of a jump, and the second regime corresponds to dominant disk rotation characterized by the formation of a hump. In the jump regime, the flow transitions from predominantly azimuthal near the disk to predominantly radial towards the free …

Authors

Abdelkader Baayoun

Published Date

2023

The transient spread of a circular liquid jet and hydraulic jump formation

The transient flow of a circular liquid jet impinging on a horizontal disk, and the hydraulic jump formation, are examined theoretically and numerically. The interplay between inertia and gravity is particularly emphasised. The flow is governed by the thin-film equations, which are solved along with a force balance across the jump. The unsteadiness of the flow is caused by a linearly accelerating jet from an initial to a final steady state. To validate the predicted boundary-layer flow evolution, an analytical development is conducted for small distance from impingement, and for small time. In addition, the predictions of the film profile and jump location are compared against numerical simulation for the transient flow, and are further validated against experiment for steady flow. The evolutions of the film thickness and the wall shear stress in the developing boundary-layer region are found to be similar to those reported for a …

Authors

Abdelkader Baayoun,Roger E Khayat,Yunpeng Wang

Journal

Journal of Fluid Mechanics

Published Date

2022/9

Updated national emission inventory and comparison with the Emissions Database for Global Atmospheric Research (EDGAR): case of Lebanon

Physically based computational modeling is an effective tool for estimating and predicting the spatial distribution of pollutant concentrations in complex environments. A detailed and up-to-date emission inventory is one of the most important components of atmospheric modeling and a prerequisite for achieving high model performance. Lebanon lacks an accurate inventory of anthropogenic emission fluxes. In the absence of a clear emission standard and standardized activity datasets in Lebanon, this work serves to fill this gap by presenting the first national effort to develop a national emission inventory by exhaustively quantifying detailed multisector, multi-species pollutant emissions in Lebanon for atmospheric pollutants that are internationally monitored and regulated as relevant to air quality. Following the classification of the Emissions Database for Global Atmospheric Research (EDGAR), we present the …

Authors

Anwar Al Shami,Elissar Al Aawar,Abdelkader Baayoun,Najat A Saliba,Jonilda Kushta,Theodoros Christoudias,Issam Lakkis

Journal

Environmental Science and Pollution Research

Published Date

2022/4/1

Patterned convection in inclined slots

An analysis of laminar natural convection in inclined slots subjected to patterned heating has been performed. The imposed heating takes a simple form characterized by a single Fourier mode combined with uniform heating. It is shown that periodic heating applied at the lower plate produces no net flow when the slot is either horizontal or vertical, but a net upward flow is generated when the slot is tilted. Periodic heating applied at the upper plate produces net downward flow in the inclined situation. The addition of uniform heating promotes the upward flow while cooling has the opposite effect. There is a critical inclination angle at which the maximum net flow rate is greatest. Dynamic and thermal boundary layers are present when the wavenumber of the imposed heating is large. The use of heating at both plates, with the same wavenumber, leads to a flow dominated by the plate exposed to a more intense heating …

Authors

JM Floryan,A Baayoun,S Panday,Andrew P Bassom

Journal

Journal of Fluid Mechanics

Published Date

2022/11

Identifying urban air pollution hot-spots by dispersion modeling when data are scarce: application to diesel generators in Beirut, Lebanon

Diesel generators are emerging as community-initiated solutions to compensate for electricity shortage in cities marred by economical crisis and/or conflict. The resulting pollution distribution in dense urban environments is a major source of concern to the population. In the absence of periodic observations from properly distributed sensors, as is the case in Beirut, physically based computational modeling stand out as an effective tool for predicting the pollutant distribution in complex environments, and a cost-effective framework for investigating what-if scenarios and assessing mitigation strategies. Here, we present a Lagrangian transport model-based study of PM2.5 dispersion originating from a large number of diesel generators in Beirut. We explore large and small scale dispersion patterns in selected smalls domains and over the entire city. The scenarios considered investigate the impact of topography, atmospheric stability, presence of buildings, diesel generators distribution, and stacks elevations for representative meteorological conditions. Assessment of these scenarios is carried out in terms of small and large scale dispersion patterns and the mean concentration at street level and population exposure proxy indicators. We also report on the efficacy of elevating the stack height as a mitigation measure at different representative wind and atmospheric stability conditions.

Authors

Elissar Al Aawar,Abdelkader Baayoun,Alaa Imad,Jad El Helou,Lama Halabi,Mohamad Ghadban,Ali Moukhadder,Marya El Malki,Sara Najem,Najat A Saliba,Alan Shihadeh,Issam Lakkis

Journal

arXiv preprint arXiv:2111.07635

Published Date

2021/11/15

A novel method to improve temperature forecast in data-scarce urban environments with application to the Urban Heat Island in Beirut

The urban heat island (UHI) effect has been the subject of much research due to its adverse effects on health, energy, and the environment. The objective of this work is to investigate the key parameters contributing to the urban heat island effect in Beirut city and to improve the temperature forecast in the city by taking these parameters into account. This is accomplished by coupling the single – layer urban canopy model (UCM) with the Weather Research and Forecasting model (WRF), where the urban parameters in UCM are calculated or fine – tuned to minimize the difference between the measured and the forecasted temperature. Urban parameters that were tuned included the roof albedo, wall albedo, roof thermal conductivity, in addition to the anthropogenic heat. To get optimum values for these parameters, simulations with different values for each parameter were performed during the four seasons and …

Authors

Mohamad Ghadban,Abdelkader Baayoun,Issam Lakkis,Sara Najem,Najat A Saliba,Alan Shihadeh

Journal

Urban Climate

Published Date

2020/9/1

Professor FAQs

What is Abdelkader Baayoun's h-index at Western University?

The h-index of Abdelkader Baayoun has been 3 since 2020 and 3 in total.

What are Abdelkader Baayoun's research interests?

The research interests of Abdelkader Baayoun are: Fluid mechanics, Heat transfer, Pollution modeling

What is Abdelkader Baayoun's total number of citations?

Abdelkader Baayoun has 63 citations in total.

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