M’hamed Beriache

Bio: M’hamed Beriache is an academic researcher from Universiti Teknologi Malaysia. The author has contributed to research in topic(s): Heat transfer & Thermal resistance. The author has an hindex of 4, co-authored 12 publication(s) receiving 76 citation(s). Previous affiliations of M’hamed Beriache include Artois University.

Applications of nanorefrigerant and nanolubricants in refrigeration, air-conditioning and heat pump systems: A review

Abstract: Nanorefrigerants are a special type of nanofluids which are mixtures of nanoparticles and refrigerants and have a broad range of applications in diverse fields for instance refrigeration, air conditioning systems, and heat pumps. In this paper thermal–physical properties of nanoparticles suspended in refrigerant and lubricating oils of refrigerating systems were reviewed. The effects of nanolubricants on boiling and two phase flow phenomena are presented as well. Based on results available in the literatures, it has been found that nanorefrigerants have a much higher and strongly temperature-dependent thermal conductivity at very low particle concentrations than conventional refrigerant. This can be considered as one of the key parameters for enhanced performance for refrigeration and air conditioning systems. Because of its superior thermal performances, latest up to date literatures on this property have been summarized and presented in this paper as well. The results indicate that HFC134a and mineral oil with TiO2 nanoparticles work normally and safely in the refrigerator with better performance. The energy consumption of the HFC134a refrigerant using mineral oil and nanoparticles mixture as lubricant saved 26.1% energy with 0.1% mass fraction TiO2 nanoparticles compared to the HFC134a and POE oil system.

Numerical simulation of fluid flow and heat transfer in rotating channels using parallel lattice Boltzmann method

Abstract: This paper presents a numerical modeling and simulation of incompressible laminar mixed convection in rotating channels using parallel lattice Boltzmann method. Individual distribution functions with D3Q19 and D3Q6 lattice types were considered to solve fluid flow and heat transfer problems, respectively. The Reynolds number was set to 100, and wall-to-inlet fluid density ratio was set to 0.2. Two rotation modes namely orthogonal and parallel modes were considered with rotation number equal to 0.2. LBM code was written in C language and was parallelized using OpenMP libraries. Domain decomposition method of data parallelism was adopted here, and simulations were conducted on a workstation with dual processors and 64 GB RAM. Predicted velocity and temperature fields were found to agree well with velocity and temperature obtained from Fluent.

Experimental study of aero-thermal heat sink performances subjected to impinging air flow

Abstract: Received: 20 July 2018 Accepted: 24 December 2018 In this study, experimental investigation of thermal and aerodynamic performances of a rectangular mini-channel heat sink subjected to an impinging air jet was carried out with the aim to improve the cooling performance of personal computer CPUs. The influence of the impinging distance on the velocity profile, the pressure drop, the case temperature, the thermal resistance, and the heat transfer coefficient are studied. Moreover, the effect of the positioning of the microprocessor (heat source) on the thermal performance was investigated. The results show a ratio \"height jet/diameter\" Y/D=0.606 offer a better cooling, and a longitudinal displacement of the heat source (central processor unit) 10 mm from the original position (center) improve the cooling performance. The enhancement rate was in a range of 10% compared to the initial position (central position before shifting the source).

Fluid Flow and Thermal Characteristics of a Minichannel Heat Sink with Impinging Air Flow

Abstract: In this study, impingement air cooling mode of forced convection is adopted for heat dissipation from high power electronic devices in association with a parallel fin heat sink. Components of airflow velocity in channel of the extended surfaces are presented and discussed. Pressure drop and other thermal performances are analyzed numerically by a C++ developed code based on finite differences schemes. Thermal and hydraulic characterization of heat sink under air-forced convection cooling condition are studied. The hydraulic parameters including velocity profiles, distribution of static pressure, and pressure drop through the heat sink are analyzed and presented schematically. Furthermore, the thermal characteristic of the aluminum approach of cooling is studied by utilizing the contours of the three-dimensional temperature distributions through the fins, base heat sink and the heat sink body. The performance of the proposed model computed by the numerical calculation is high compared to current heat sinks as expected of the previous studies.

The Design and Analysis of Experiments

Abstract: THE DESIGN AND ANALYSIS OF EXPERIMENTS. By Oscar Kempthorne. New York, John Wiley and Sons, Inc., 1952. 631 pp. $8.50. This book by a teacher of statistics (as well as a consultant for \"experimenters\") is a comprehensive study of the philosophical background for the statistical design of experiment. It is necessary to have some facility with algebraic notation and manipulation to be able to use the volume intelligently. The problems are presented from the theoretical point of view, without such practical examples as would be helpful for those not acquainted with mathematics. The mathematical justification for the techniques is given. As a somewhat advanced treatment of the design and analysis of experiments, this volume will be interesting and helpful for many who approach statistics theoretically as well as practically. With emphasis on the \"why,\" and with description given broadly, the author relates the subject matter to the general theory of statistics and to the general problem of experimental inference. MARGARET J. ROBERTSON

An overview on the light alcohol fuels in diesel engines

Abstract: One of the most useful characteristics of the science is its cumulative concept. This work was done as an attempt to contribute this nature. As many reports have revealed that petroleum based fuels are depleting and releasing harmful emissions to the natural atmosphere, law makers contemplate to eliminate or at least mitigate these issues for the near future. In order to deeply address these issues, many studies have been proposed on the usage of alternative fuels such as methanol and ethanol to diminish exhaust gas pollution released from the internal combustion engines and to replace conventional fuels with alternative fuels that have extensive feedstock. Light alcohols (methanol and ethanol) are the most promising fuels in internal combustion engines thanks to their extensive feedstock, low-emissions, low-cost and easy-adaptability to the engine technologies. It has been recorded in the recent past that many researches have worked on light alcohol effects especially in diesel engines. In the light of the previous literature, this present paper reviews the past works to identify the effects of light alcohols on performance, combustion and emissions in the internal combustion engines including the productions, economic benefits, applications, demand and supply, environmental and human impacts of light alcohols. Various applications of light alcohols in diesel engines with diesel, biodiesel, the blends of diesel/biodiesel and diesel/biodiesel/esters in the internal combustion engines are summarized.

Potential of Nanorefrigerant and Nanolubricant on Energy Saving in Refrigeration System – A Review

Abstract: Refrigeration system is one of the biggest reason of the expanding pattern of energy consumption, thus, energy saving is one of the best approach to overcome this issue. Nanofluids show extraordinary potential in upgrading the thermodynamic and mechanical performance of the refrigeration system. In the refrigeration system, the effort to improve the efficiency of the system is by introducing nanoparticles in refrigerant (nanorefrigerant) and in lubricant (nanolubricant). In this paper, a comprehensive review is carried out to investigate the impact of nanorefrigerant and nanolubricant on energy saving. The overview consists of properties enhancement of nanorefrigerant and nanolubricant, tribological performance, heat transfer enhancement, performance in heat exchanger, improvement in refrigeration system and pressure drop characteristic. The previous results showed that the best energy saving with 21% less energy used was with the use of 0.5% volume ZnO-R152a refrigerant nanolubricant. Both the suction pressure and discharge pressure were brought down by 10.5% when nanorefrigerant was utilized. The evaporator temperature was lessened by 6% with the utilization of nanorefrigerant. The replacement of R134a with R152a gives a green and clean environment, with zero ozone depleting potential (ODP) and less global warming potential (GWP). The performance of refrigeration system was significantly enhanced.

Forced convection of nanofluids in an extended surfaces channel using lattice Boltzmann method

Abstract: Research on nanofluids for heat transfer augmentation has received a great attention from many researchers. Recently, many numerical works have been conducted to examine their applicability in predicting heat transfer with nanofluids. In the present study, a two-dimensional (2D) lattice Boltzmann method (LBM) was applied for numerical simulation of forced convection in a channel with extended surface using three different nanofluids. The predicted were carried out for the laminar nanofluid flow at low Reynolds number (10 ⩽ Re ⩽ 70), nanofluid concentration (0.00 ⩽ φ ⩽ 0.050), different geometric parameter (0.2 ⩽ A = l/H ⩽ 0.8) and relative height of the extended surfaces (0.05 ⩽ B = h/H ⩽ 0.35). The results indicated that the average Nusselt number increases when the nanofluid concentration increased from 0% to 5%. Moreover, the effect of the nanofluid concentration on the increasing of heat transfer is more noticeable at higher values of the Reynolds number. It is concluded that the use of extended surfaces can enhance the rate of heat transfer for certain arrangements. We also found that the nanofluid with CuO nanoparticles performed better enhancement on heat transfer compared Al2O3/water and TiO2/water nanofluids.

Pool boiling heat transfer to CuO-H2O nanofluid on finned surfaces

Abstract: In the present research, the general aim is to understand further the potential effect of the surface shape and geometrical specification of rectangular parallel fins developed on the surface on the heat transfer coefficient, bubble formation, and fouling of the nanoparticles. To achieve this, the boiling thermal performance of the copper oxide nano-suspension (NS) was quantified on the modified surfaces with different geometrical specifications, including the width and height of the fins and space between fins. Results showed that the designed fins reduce the rate of the fouling of the nanoparticles on the boiling surface such that the best thermal performance was achieved for the surface modified with the fins with more towering height and smaller width. Also, the fouling thermal resistance was found to follow an asymptotic behaviour while developing three regions of inception, growth, and equilibrium. During the inception of fouling, negative values were measured for the fouling thermal resistance, which was attributed to the enhancement in the specific surface area and thermal performance of the system. Overall, the presence of the fins improved the thermal performance of the system in comparison with the plain surface.