Yazar "Alsharari, Abdulrhman M." seçeneğine göre listele

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    EXPERIMENTAL INVESTIGATION OF COOLING PERFORMANCE IN ELECTRONIC INSTRUMENTS
    (Vinca Inst Nuclear Sci, 2023) Bensafi, Mohammed; Kaid, Noureddine; Shnawa, Ammar H.; Alsharari, Abdulrhman M.; Mohsen, Karrar S.; Akgul, Ali; Abdullaeva, Barno
    This study explores the principle of producing cold through heat absorption at a temperature lower than ambient temperature, which requires the use of an endothermic mechanism. Specifically, the study focuses on evaluating multiple thermoelectric coolers using aluminum water heat exchangers as a means of validating a proposed correlation through a series of experiments. The system utilizes water as a coolant and a thermoelectric cooler coupled with a heatsink to cool it. The cooling power of the system is controlled by adjusting the temperatures of the hot and cold heatsinks and the coolant flow through the heat exchanger based on governing equations. In addition to assessing the cold-side temperature, the research also investigates the system COP of the thermoelectric system. The results indicate that a thermoelectric cooler with a lower thermal resistance is more effective at cooling and can achieve a lower cold-side temperature. Conversely, a cold-side heatsink with a higher thermal resistance provides lower cooling power. Two experiments were conducted to acquire comprehensive data on the thermoelectric devices, and the obtained results and experience were used to categorize the utilization of the Peltier model. The first experiment achieved an 84% success rate, while the second experiment achieved a rate of around 97-95%, highlighting the potential for further experimentation with alternative configurations.
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    MHD Stagnation Point Radiative Flow of Hybrid Casson Nanofluid across a Stretching Surface
    (Universal Wiser Publisher, 2024) Rani, Sandhya; Reddy, Venkata Ramana; Sridhar, W.; Akgul, Ali; Alsharari, Abdulrhman M.; Asad, Jihad
    The current investigation explores the hybrid Casson nanofluid stagnation point flow on a transient stretching surface under the impact of thermal radiation. The Joule heating effect is also considered in this study. Copper and aluminium hybrid nanoparticles are used. The guiding partial differential equations are broken down into nonlinear ordinary differential equations using adequate affinity transmutations. The subsequent equations are worked out by employing the Keller box scheme. The numerical findings for the study are represented by plotting velocity, and temperature graphs for various parameters like radiation parameter (Rd), Casson parameter (beta), magnetic parameter (M), Prandtl number (Pr), and unsteady parameter (s). As well, the local parameters coefficient of skin friction is calculated. For progressive estimates of the Casson parameter, the velocity of the liquid flow reduces. On intensifying the Prandtl number temperature of the fluid diminishes. Also, the effect of nanoparticles volume fraction of both nanoparticles is observed. It was found that for escalating values of both nanoparticle velocities, the velocity of the fluid flow reduces and the opposite trend is observed for the temperature profile. The usage of hybrid nanofluids has the advantage of heat transfer enhancement. The outcomes of the current investigation are good and in congruence with existing literature.
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    Microgravity analysis of periodic oscillations of heat and mass transfer of Darcy-Forchheimer nanofluid along radiating stretching surface with Joule heating effects
    (Elsevier B.V., 2024) Ullah, Zia; El-Zahar, Essam. R.; Seddek, Laila F.; Eladeb, Aboulbaba; Kolsi, Lioua; Alsharari, Abdulrhman M.; Asad, Jihad
    Reduced gravity impact on mixed convection flow plays a significant role for designing of electric-generating plants in space, unwanted effects of free convection, thermodynamic stability, space devices, surface tension and movement of nanoparticles. The novelty of present work is to find the impact of reduced gravity, Joule heating and thermal radiations on Darcy Forchheimer magnetized flow of nanofluid along the stretching porous sheet. The variable gravity is assumed as temperature dependent with maximum density and maximum density. The governing model is converted into convenient model to find physical thermo parameters. The primitive steady, real and imaginary equations are formed by using stokes and primitive transformations. To make programming algorithm in FORTRAN Lahey-90/95, the primitively terms are deduced in each equation. For tabular and numerical findings of steady velocity, temperature and concentration, the implicit form of finite difference approach is applied with Gaussian elimination method. The fluctuating skin friction, fluctuating heat transfer and fluctuating mass transfer are displayed by using steady outcomes in main formula. It is found that the magnitude of fluid velocity enhances as magnetic force, reduced gravity and Darcy Forchheimer parameter enhances. It is concluded that temperature distribution decreases as magnetic force enhances. It is noted that oscillating frequency in skin friction and heat transfer enhances as Schmidt number enhances. It is found that the maximum fluctuating layer in heat and mass transfer enhances as Prandtl number enhances. © 2024 The Author(s)
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    NUMERICAL STUDY ON A NATURAL GAS-FUELED ENGINE UNDER LOW TEMPERATURE COMBUSTION MODE
    (Vinca Inst Nuclear Sci, 2023) Kezrane, Cheikh; Naima, Khatir; Alsharari, Abdulrhman M.; Al-Hameed, Mazin Riyadh; Zearah, Sajad A.; Akgul, Ali; Abdullaeva, Barno
    Natural gas, which is also referred to as eco-friendly fuel, is being seen as a potential solution to challenge the decline of crude oil resources and the deteriorating air quality in urban areas. This fuel has been verified to emit less CO, HC, and PM compared to other fuels. A potential approach to reducing NOx and soot emissions while also achieving low fuel consumption is the low temperature combustion process. In this study, internal combustion engines were simulated under various conditions. The objective was to investigate the effect of different operating variables on the low temperature combustion mode. To begin with, a natural gas powered engine was modeled using complex chemical kinetics software. The outcomes of the simulation were then compared to experimental data, demonstrating a high level of agreement. Subsequently, the impacts of key variables, including the air-fuel ratio, compression ratio, and engine speed, were analyzed using a cycle simulation code. Increasing the compression ratio improves engine performance, and the specific fuel consumption decreases. However, it leads to a significant increase in NOx emissions until a certain value. Thereafter, it changes the trend. Engine speed indirectly affects performance by increasing fuel consumption and changing ignition timing. A leaner air fuel ration may be used to produce more power and keep the temperature of combustion below a certain value (low-temperature combustion), ensuring low NOx emissions.