Professor

Hajjar Ahmad

Affiliation: VinUniversity, Hanoi, Viet Nam

CECS

[email protected]

0

Citations

24

h-index

Scopus ID: 57211398187

https://orcid.org/0000-0003-4258-9442

Introduction

Ahmad Hajjar is an Assistant Professor of Mechanical Engineering in the College of Engineering and Computer Sciences, VinUniversity. Prior to joining VinUniversity in September 2023, he had been working as an Assistant Professor at the University of Lyon, France since 2019, and was a Research Fellow in the Centre for Offshore Research and Engineering at the National University of Singapore in 2018. He received his PhD in Mechanics – Civil Engineering from the University of Lorraine, France in 2017 and a Master’s degree in Mechanics and Energy Processes from the same university in 2014.

Affiliation: VinUniversity, Hanoi, Viet Nam

Research Output

Thermal Performance and Melting Behavior of Partially Funnel-Shaped Anisotropic Copper Foam/Paraffin PCM Within an LHTES

Mozaffari Masoud, Hajlaoui Khalil, Younis Obai, Ahmed Awadallah, Khidhir Dana Mohammad, Hajjar Ahmad, Ghalambaz Mehdi, Alrasheedi Nashmi H.
  • Heat Transfer
DOI: 10.1002/htj.23387
  • anisotropic metal foam layer
  • anisotropic metal foams
  • copper metal foam
  • funnel-shaped geometry
  • latent heat thermal energy storage
  • phase change

Comprehensive review of optimization strategies for phase change materials: Techniques, applications, and challenges in thermal storage systems

Izadi Mohsen, Pop Ioan, Shehzad Sabir Ali, Alqurashi Faris, Mohamed Mohamed H., Hajjar Ahmad, Mahariq Ibrahim
  • International Communications in Heat and Mass Transfer
DOI: 10.1016/j.icheatmasstransfer.2025.109123
  • Extended surfaces
  • Finned PCM
  • Melting and solidification process
  • Nano-PCM
  • Passive parameter
  • PCM-filled porous media

The impact of orientation and scale of kite-shaped anisotropic metal foam layers on paraffin-based latent heat thermal energy storage units

Aljibori Hakim S. Sultan, Hajjar Ahmad, Raizah Zehba, Alresheedi Faisal, Akremi Ali, Elhassanein Ahmed, Ghalambaz Mohammad
  • Journal of Energy Storage
DOI: 10.1016/j.est.2025.115989
  • Anisotropic metal foams
  • Copper metal foam
  • Kite-shaped geometry
  • Latent heat thermal energy storage (LHTES)
  • Phase change material

Enhancing LHTES efficiency using asymmetric hexagon anisotropic metal foam layer: A comparative study on orientation and scale

Mozaffari Masoud, Hajjar Ahmad, Sheremet Mikhail, Younis Obai, Ghalambaz Mohammad
  • Thermal Science and Engineering Progress
DOI: 10.1016/j.tsep.2025.103343
  • Anisotropic Metal Foam Layer (AMFL)
  • Asymmetric Hexagon Geometry
  • Copper Metal Foam
  • Latent Heat Thermal Energy Storage (LHTES)
  • Phase Change

Optimizing magnetic-natural convection using anisotropic porous media: A local thermal non-equilibrium approach

Izadi Mohsen, Sheremet Mikhail A., Hajjar Ahmad, Alqurashi Faris, Mahariq Ibrahim
  • Physics of Fluids
DOI: 10.1063/5.0256042

Insight into Natural Convection and Magnetic Energy Dynamics within a Triple Enclosure Filled with Ferrofluid

Ben Hamida Mohamed Bechir, Hajjar Ahmad, AlGhamdi AbdulAziz A., Izadi Mohsen, Mohamed Mohamed H., Alqurashi Faris
  • Arabian Journal for Science and Engineering
DOI: 10.1007/s13369-024-09301-1
  • Ferromagnetic fluids
  • Permanent magnetic-natural convection
  • Porous triple enclosure
  • Two-equation energy model

Graphite-Enhanced Paraffin and Beeswax Composites: Numerical and Experimental Investigations of Thermal Properties

El Idi Mohamed Moussa, Atli Atilla, Hajjar Ahmad, Kraiem Manel, Karkri Mustapha
  • Proceedings of the World Congress on Mechanical Chemical and Material Engineering
DOI: 10.11159/htff25.246
  • Beeswax
  • Paraffin
  • PCM
  • Thermal management

Passive Controlling of Fluid Flow and Heat Transfer Using a Pair of Magnets Through Anisotropic Porous Structure Hexagonal Enclosure

Izadi Mohsen, IDI Mohamed Moussa EL, Hajjar Ahmad, Alqurashi Faris, Mohamed Mohamed H., Ben Hamida Mohamed Bechir, Mahariq Ibrahim
  • Arabian Journal for Science and Engineering
DOI: 10.1007/s13369-025-10226-6
  • Anisotropic porous structure
  • Hexagonal enclosure
  • Passive control of fluid flow
  • Permanent magnetic field

Corrigendum to “Effect of anisotropic porous structure on mixed permanent magnetic-convection heat transfer under permanent twin magnets” [ICHMT, 158, November 2024, 107831] (International Communications in Heat and Mass Transfer (2024) 158, (S0735193324005931), (10.1016/j.icheatmasstransfer.2024.107831))

Izadi Mohsen, Hajjar Ahmad, El Idi Mohamed Moussa, Lam, Alqurashi Faris, Mohamed Mohamed H.
  • International Communications in Heat and Mass Transfer
DOI: 10.1016/j.icheatmasstransfer.2024.108230

Heat transfer optimization in power-law ferrofluids under gravitational and microgravity conditions

Al Arni Saleh, Mehryan, Abidi Awatef, Hajjar Ahmad, Ben Khedher Nidhal, Mahariq Ibrahim
  • Case Studies in Thermal Engineering
DOI: 10.1016/j.csite.2024.105546
  • Electronic device
  • Magnetic Rayleigh number
  • Magneto-gravitational convection
  • Non-Newtonian ferrofluid
  • Permanent magnet
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Keyphrases

  • anisotropic metal foam layer
  • anisotropic metal foams
  • copper metal foam
  • funnel-shaped geometry
  • latent heat thermal energy storage
  • phase change
  • Extended surfaces
  • Finned PCM
  • Melting and solidification process
  • Nano-PCM
  • Passive parameter
  • PCM-filled porous media
  • Anisotropic metal foams
  • Copper metal foam
  • Kite-shaped geometry
  • Latent heat thermal energy storage (LHTES)
  • Phase change material
  • Anisotropic Metal Foam Layer (AMFL)
  • Asymmetric Hexagon Geometry
  • Copper Metal Foam
  • Latent Heat Thermal Energy Storage (LHTES)
  • Phase Change
  • Ferromagnetic fluids
  • Permanent magnetic-natural convection
  • Porous triple enclosure
  • Two-equation energy model
  • Beeswax
  • Paraffin
  • PCM
  • Thermal management
  • Anisotropic porous structure
  • Hexagonal enclosure
  • Passive control of fluid flow
  • Permanent magnetic field
  • Electronic device
  • Magnetic Rayleigh number
  • Magneto-gravitational convection
  • Non-Newtonian ferrofluid
  • Permanent magnet
  • All-around review
  • Heat exchanger
  • Inserts
  • Passive strategies
  • Thermal storage
  • Turbulators
  • Anisotropic porous medium
  • Partitioned hexagonal enclosure
  • Simultaneous magnetic-convection effect
  • Double wavy wall cavity
  • Energy storage
  • Melting heat transfer
  • NePCM
  • Taguchi optimization method
  • Local thermal non-equilibrium model
  • NEPCM suspension
  • Porous enclosure
  • Thermal vibrational convection
  • Partitioned triple porous enclosure
  • Permanent magnetic-gravitational heat transfer
  • Twin magnets
  • Various configuration
  • Melting phenomenon
  • Multilayer roof structure, energy loss
  • Mechanical vibration
  • Melting temperature
  • Nano-encapsulated phase change material
  • Stefan number
  • Vibrational Rayleigh number
  • Comsol multiphysics
  • Energy losses
  • Innovative block structure
  • Roof structures equipped by PCM
  • Metal foam
  • Building enclosures
  • Comsol Multiphysics
  • Phase change materials
  • Thermal resistance
  • Energy loss
  • Magnetic field
  • PCM layer
  • Roof structure
  • Round-corner double semi-hexagonal
  • Nano-PCM-Building material
  • Natural convection
  • Ferrofluid
  • Magnetic convection
  • Porous double semicircle enclosure
  • Two permanent magnets

Computer Science

  • Condensed Matter Physics

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