Rachid Bennacer

Rachid Bennacer
Ecole Normale Supérieure de Paris / Univ. Paris Saclay

Professor (Exceptionnal Class)

About

505
Publications
78,376
Reads
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4,883
Citations
Citations since 2016
212 Research Items
2913 Citations
20162017201820192020202120220100200300400500
20162017201820192020202120220100200300400500
20162017201820192020202120220100200300400500
20162017201820192020202120220100200300400500
Introduction
Coordinate international Affairs and international joint Ph.D, at Univ Paris-Saclay; Director of the Innovation-Prospective and Research division of the ECAM-EPMI; Head of the Transfer & Environmental research group (LMT lab./ENS); Adjunct Professor at TUC.... Rachid Bennacer currently works at the Department of Civil Engineering , Ecole normale supérieure Paris-Saclay. Rachid does research in Civil Engineering, Mechanical Engineering and Environmental Engineering. Their current project are covering Material&durability (ODOBA, CONCRETE), Renewable Energy (HYBRID_Captur), Efficient Cooling (THERMASMART), Morphing and adaptative 3D heat exchanger (PASS-ARCHI) ..
Additional affiliations
June 2019 - present
Université Paris-Saclay
Position
  • Administrative reponsabilities
Description
  • Coordinate international Affairs and international joint Ph.D, at Univ Paris-Saclay Director of the Innovation-Prospective and Research division of the ECAM-EPMI Head of the Transfer & Environmental research group (LMT lab./ENS)
July 2017 - present
May 2013 - present

Publications

Publications (505)
Article
Full-text available
Researches on droplet evaporation has a vast range of applications in different fields. The mechanisms of droplets evaporation have been a topic of investigation for decades. The droplet after spreading on the substrate; exhibit constant evaporation rate for a constant base diameter and decreasing contact angle; followed by another evaporation mode...
Article
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In this paper, the moisture loss mechanism in biological tissue of apples was experimentally investigated in order to understand this mechanism and hence to extend their shelf life. An image conversion procedure, based on the use of image processing and AlgoLab Photo Vector softwares, was developed in order to characterise physically the internal p...
Article
Full-text available
In this paper, a thermohydraulic characterisation of a reciprocating room temperature active magnetic regenerator, with gadolinium particles used as a magnetocaloric material and water used as a heat transfer fluid, was numerically carried out. A two-dimensional transient flow model was developed using COMSOL Multiphysics software in order to deter...
Article
Phase change materials (PCMs) have high thermal inertia while hygroscopic materials have high hygric inertia. However, few studies have integrated the two materials and considered both hygrothermal behavior and energy performance. This study proposed a novel multilayer building envelope integrated by PCM and bio-based hygroscopic material (hemp con...
Article
Full-text available
The feasibility of Plus Energy Building for a sample relevant case is investigated. After a literature review aimed to identify key aspects of this type of buildings, a preliminary evaluation of the thermal performance of a building constructed using conventional material is presented together with a parametric analysis of the influence of typical...
Article
In this paper, the effects of operating conditions on the energy efficiency of a reciprocating room temperature magnetic refrigerator were experimentally investigated in order to optimise its refrigeration performance. An experimental setup of a magnetic refrigerator allowing the thermal characterisation of an active magnetic regenerator, with gado...
Article
In dry and cold climates, a cool mist humidifier and a floor heating system are typically used in combination to achieve a pleasant residential environment. In order to investigate the interaction between a humidification process and a heating process, a total of 12 experimental tests were carried out, which included nine experimental groups with a...
Preprint
Full-text available
Goal: Don't miss the pleasure of our International Conference ICOME 22. Save the Date : MAY 22-25, 2022. BAKU - AZERBAIJAN. Special Topical School : Next November, at Lorraine University, Metz-France. ICOME22 updated Website: http://www.icome.ecam-epmi.fr/index.html Call for Papers : http://www.icome.ecam-epmi.fr/topics/index.html Submission i...
Conference Paper
Since the outbreak of the Covid-19 pandemic, working from home has become the norm for millions of workers in the world. Indoor humidification and heating are essential for health and comfort in a dry and cold climate. In order to investigate the interaction between humidification process using a cool mist humidifier and the heating process using a...
Article
Full-text available
The present study aims to understand the influence of small quantities of poly-ethylene oxide (PEO) diluted in pure distilled water of concentrations 50, 100 and 200 parts per million (ppm) in the impact phenomenon of drops onto substrates of Parafilm M, aluminium and glass. Both the static aspects such as maximum spreading area, and the dynamic as...
Chapter
In this paper, a modelling study on evaporative freezing process of water droplet was conducted in order to better understand the artificial snowmaking and hence to optimise its machine design. To this end, mass and heat transfer theoretical models of a single water droplet cooling in an air space were established and implemented in a numerical mod...
Preprint
Full-text available
In this paper, the effects of operating conditions on the energy efficiency of a reciprocating room temperature magnetic refrigerator were experimentally investigated in order to optimise its refrigeration performance. An experimental setup of a magnetic refrigerator allowing the thermal characterisation of an active magnetic regenerator, with gado...
Article
Phase change materials (PCMs) can improve indoor thermal comfort and reduce energy consumption, while bio-based concrete is an environment-friendly material that enables indoor humidity regulation and heat insulation. However, only a few studies have explored the integrated application of the two materials and comprehensively analyzed the energy an...
Chapter
Full-text available
In this chapter, a thermohydraulic characterisation of a reciprocating room temperature active magnetic regenerator, with gadolinium particles used as a magnetocaloric material and water used as a heat transfer fluid, was numerically carried out. A two-dimensional transient flow model was developed using COMSOL Multiphysics software in order to det...
Article
In this work, we study the capillary rise mechanisms in heterogeneous porous material with different capillary sizes. Both theoretical and experimental work are performed to investigate the time evolution and the exchange at the interface of different porous media (different capillaries diameters). The first basic part contains the homogeneous capi...
Article
The use of small droplets to decontaminate atmospheres from organic vapours (VOCs) is a very attractive prospect. Surprisingly this simple yet promising idea has not been extensively explored in literature. Fundamental aspects of this process and mass/heat transfer are investigated in this study. We demonstrate that sessile droplets in contaminated...
Article
Full-text available
The performance of the air-cooler in refrigeration systems plays a key role in their energy efficiency. Here, the plenum-chamber coefficient was defined to investigate a possible way of enhancing the refrigeration coefficient that reflects the efficiency of the system. To investigate the influence of the plenum-chamber coefficient on the frosting a...
Conference Paper
Full-text available
Grinding balls in wet ball mill are important consumables in mine grinding equipment, which have poor wear resistance and large consumption. It is imperative to find excellent wear-resistant materials for the grinding balls. Carbidic Austempered Ductile Iron (referred to as CADI) was used as small and medium-sized wet ball mills. This grinding ball...
Article
Full-text available
In this study, we have analyzed the effect of elastic deformations on the static characteristics of finite self-lubricating journal bearings. This analysis takes into account the rheological lubricant behavior which obeys to Rabinowitsch law. The governing equations considering both the fluid flow in the porous bush and the fluid film lubricant are...
Article
Numerical investigation is performed to analyze natural convection heat transfer characteristics within a corrugated surface enclosure filled with fluid under the Rayleigh-Bénard (RB) instability. The impact of the geometric contribution associated with the convective RB effect, is analyzed to provide qualitative heat transfer and flow structure. S...
Article
Internal Swellings Reactions (ISR) are pathologies that are likely to degrade concrete by causing swelling, cracking and major disorders in structures. Many laboratory studies of internal swelling reactions are realized on relatively small size samples. Those laboratory samples do not allow to replicate real conditions to which the real concrete is...
Article
Elastocaloric cooling, also known as thermoelastic cooling, has been identified as a promising alternative to current state-of-the-art vapour compression cooling systems which tend to use environmentally unfriendly refrigerants. In this study, five different types of rubbers including natural rubber, silicone rubber, cis-butadiene rubber, styrene-b...
Article
Full-text available
In the current work, we have investigated the flow past a semi-infinite porous solid media, after presenting a similarity transformation, governing equations mapped to a system of non-linear PDE. The flow of a dusty fluid and heat transfer through a porous medium have few applications, viz., the polymer processing unit of a geophysical, allied area...
Article
Full-text available
Flow and heat transfer analysis in ventilated cavities is one of the most widely studied problems in thermo-fluids area. Two-dimensional mixed convection in a ventilated rectangular cavity with baffles is studied numerically and the fluid considered in this study is hot air (Pr = 0.71). The horizontal walls are maintained at a constant temperature,...
Article
Full-text available
In this paper, the enhancement of refrigeration system performance by refrigerant capillary injection in evaporator was experimentally investigated. An experimental bench was developed in order to compare the performance of a refrigeration system operating in conventional throttling and capillary injection modes. The temperature distribution in the...
Article
This paper deals with the experimental investigation of hygrothermal behavior of wooden-frame building envelope. The experiment was based on in-situ monitoring of a full size experimental monozone house built at the University of Lorraine. Variations in temperature and relative humidity inside and outside the envelope were logged simultaneously wit...
Article
Spruce wood, as all biosourced materials, is very sensitive to relative humidity changes, which can cause dimensional variations. In some cases, it leads to eccentricity, degradation and deterioration of the wooden structures. The 3D methods of evaluation of the spruce wood hydric behavior needs important financial resources and investigation. That...
Article
In this study the delicate invasion nature of pure supercritical carbon dioxide sCO2, alongside the determination of the main boundaries for sCO2 flow-pattern transitions inside the nanopores of treated 3D-porous matrix are investigated numerically. Sensitivity parameters under various sCO2 injection rates and flow regimes are discussed. The numeri...
Article
Full-text available
In this paper, the effects of asymmetric boundary conditions encountered in refrigerators on the freezing process of raw potatoes were investigated in order to improve their preservation and extend their shelf life. A 2D numerical model, based on experimentally determined temperature-dependent thermophysical properties of potatoes, was first develo...
Article
Bio-based materials have strong hygrothermal behavior and phase change materials (PCMs) have high thermal inertia, but they have usually been studied separately in most research. In this paper, the hygrothermal behavior of a multilayer building envelope integrating hemp lime concrete (HLC) and PCM was investigated at experimental level. The envelop...
Article
This paper exhibits the oscillatory characteristics of a free convective flow of nanofluids in horizontal concentric annuli of pilot dimensions to provide a mechanical solution against their particles settling which occurs by aggregation. These nanofluids are generated according to each class of particles that may exist with four types of industria...
Article
In buildings with highly glazed facades, the main drawback of radiant floors is the overheating problem when exposed to direct solar radiation. Combined with local climate data from Troyes, an experimental investigation was performed under various exposure duration 2, 4, and 6 hours with different solar intensity scenarios that were experimentally...
Article
In this paper, an experimental study on high power microwave drying of apples was conducted in order to better understand their moisture kinetics and microstructure evolution and hence extend their shelf life. To this end, a specific experimental apparatus of microwave drying was developed. Apples slices were dried until reaching weight losses of 1...
Article
Full-text available
This work aims to elucidate the microstructure characteristics of each phase in carbidic austempered ductile iron and the nucleation and growth of acicular ferrite in an austempering temperature range of 250–450 °C. The research results showed that the carbides (Fe, Cr)3C obtained by the eutectic reaction had high indentation hardness and indentati...
Article
Full-text available
The problem of Rayleigh–Bénard’s natural convection subjected to a temporally periodic cooling condition is solved numerically by the Lattice Boltzmann method with multiple relaxation time (LBM-MRT). The study finds its interest in the field of thermal comfort where current knowledge has gaps in the fundamental phenomena requiring their exploration...
Article
The insertion of a broken twisted tape (BTT) in tube is a novel passive heat transfer augmentation method, which constitutes the subject of the present investigation. Effect of BTT on heat transfer performance in novel triangular axial corrugated tubes is investigated experimentally and numerically. In order to augment the thermohydraulic performan...
Article
Full-text available
Advanced materials for energy harvesting, storage, sensing and environmental engineering II
Article
Full-text available
The present study is a numerical inspection of the natural convection with double diffusion in a tilted square cavity filled with a vertical bi-layered composed porous and an adjacent fluid. Isotropic and homogeneous porous layer is considered in this case study. The porous layer is saturated by an aqueous solution with a Prandtl number Pr = 7. The...
Article
Full-text available
Present study reports a computational investigation on heat transfer and pressure drop characteristics for flow through a heat exchanger tube fitted with novel hybrid ribs by using magnetic nanofluid (Fe 3 O 4 ). Effects of different rib geometry on heat transfer and pressure drop characteristics have been investigated for Reynolds number ranging f...
Article
Full-text available
The performance of the air-cooler in the refrigeration system plays a key role in improving the energy efficiency. Here, the plenum chamber coefficient was defined to study a possible way of enhancing the refrigeration system performance. In order to investigate the influence of the plenum chamber coefficient on the frosting and the cooling system...
Article
Full-text available
The change of evaporation liquid on another immiscible liquid has important guiding significance for many applications. In this experiment, the geometric temperature distribution and evaporation rate of n-hexane droplets were observed and recorded by changing the temperature of deionized water. The results show that with the increase of temperature...
Article
Full-text available
Despite the efforts to develop new solutions to achieve the objectives of positive buildings in energy, a few studies in this area has been performed using a porous media foam type. The aim of this paper is to present the behaviour transfers of flow through a multi-structured porous media and to achieve the influence of the porosity and the thermal...
Article
Full-text available
The development of positive-energy buildings is nowadays an important societal challenge and the research objective of many laboratories. Working towards this direction, we describe in the present report the development of active and reactive walls, by employing a multi-fiber, volumetrically structured porous medium. Flow and transfer characterizat...
Article
Full-text available
Special Issue in MATEC Web of Conferences, Volume 330, With great pleasure, I invite you to take a look at our New Special Issue (International Conference on Materials & Energy (ICOME’19)). More than 50 interesting papers have been published within. Link : https://www.matec-conferences.org/articles/matecconf/abs/2020/26/contents/contents.html E...
Article
The present investigation presents the results of an experimental study of a free-falling liquid gallium drop in a quiescent water. Experiments were performed with different drops size in the range of 2.67 mm to 5.56 mm. All experiments were carried out under isothermal conditions, where the liquid Gallium temperature equals the temperature of the...
Article
The quantification of the bound and free water within spruce wood and the water and solid matrix interactions are still unknown by the researchers. Many specimens were firstly studied by Nuclear Magnetic Resonance function of the relative humidity. For each test, the bound and free water were calculated. After that, spruce wood specimens were studi...
Article
The water transport especially drying process in concrete has a significant influence on its structural durability and stability. However, the inconsistent values of parameters in drying model studies increases the difficulty in predicting the drying process of cementitious materials. In this work, an experimental-numerical-identification coupling...
Article
In this work, different contents of Cu were added into carbidic austempered ductile iron (CADI) to improve the corrosion resistance and the corrosive wear resistance. Microstructures of CADI have been systematically investigated by scanning electron microscope (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), atomic force micr...
Article
Natural convection characteristics in an enclosure having U-shape that contains nanofluid are studied by extensively examining the effect of aspect ratio. The three outer walls of cavity are at isothermal high temperature, and facing inner walls are at a uniform low temperature. Computations are performed to explore the effect of the aspect ratios...
Article
Hybrid solar PVT has the potential to become a major player in the renewable energy sector, but one of the main barriers is the lack of reliable data due to limited number of monitored PVT hybrid systems with proven thermal performance results. In order to address this issue, a statistical study was realized to analyze in-field performances of twen...
Book
Volume 307 (2020) International Conference on Materials & Energy (ICOME’17 and ICOME’18) Tianjin, China and San Sebastian, Spain, July 6-9, 2017 and April 30-June 4, 2018 M. El Ganaoui, B. Liu, R. Bennacer, S. Morsli and M. Darcherif (Eds.)
Technical Report
Full-text available
ABOUT Modeling and Simulation Approaches are vital topics, given current and future challenges of energy transition and sustainable development, as well. Subsequently, our sixth Topical School Edition, namely "Modeling and Simulation Approaches for Materials and Energy" will focus on the relationship between energies' optimization & simulation topi...
Article
Full-text available
The phase precipitation curves of carbidic ductile iron with Nb element were simulated by the thermodynamic module in JMatPro software. The lattice mismatch between NbC and M3C was analyzed using Bramfitt two-dimensional mismatch theory, and the bonding strength (adhesive work) and interface stability (interfacial energy) of M3C(100)/NbC(110) inter...
Article
Full-text available
The main objective of our work is to light out the three-dimensional flow of an Ag-water nanofluid within a lid-driven cubical space which equipped with a spherical heater into its center. Due to its crucial role in the characterization of the main transfer within such configurations, impact of some parameters is widely inspected. It consists the R...
Article
Full-text available
The main purpose of our investigation is to providethe impact of some pertinent parameters,asthe thermal buoyancy and the geometryratio,on the oscillatory flow’stability of a Newtonian fluid which occurs within an annulus, found between a cold outer circular cylinder and a hot inn