Yazar "Mohsen, Karrar S." seçeneğine göre listele

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    CFD SIMULATION AND OPTIMIZATION OF HEAT TRANSFER ENHANCEMENT IN HEV STATIC MIXERS WITH ROTATED ANGLES FOR TURBULENT FLOWS
    (Vinca Inst Nuclear Sci, 2023) Kaid, Noureddine; Akgul, Ali; Alkhafaji, Mohammed Ayad; Mohsen, Karrar S.; Asad, Jihad; Jarrar, Rabab; Menni, Younes
    Static mixers are becoming increasingly popular because they are energyefficient, cost-effective, and easy to maintain. Mixing is an essential unit operation in many chemical industries. In this study, a modified high efficiency vortex static mixer was used to examine laminar flows in a rectangular duct. To encourage fluid rotation and improve mixing with heat transfer, the modified high efficiency vortex set was rotated by angles of 0 degrees, 5 degrees, 10 degrees, 20 degrees, 25 degrees, and 30 degrees. The Reynolds number varied from 3000 to 8000. The outcomes demonstrated that the performance of the mixing was significantly impacted by the modified high efficiency vortex set. The highest mixing efficiency was achieved with a rotation angle between 15 degrees and 20 degrees. Furthermore, the rotations reduced pressure loss in the system and enhanced heat transfer performance, by creating vortices. These results show how modified high efficiency vortex static mixers can improve mixing and heat transfer efficiency in turbulent flows, with prospective utilization across diverse chemical sectors.
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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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    OPTIMIZING SOLAR WATER HEATER PERFORMANCE THROUGH A NUMERICAL STUDY OF ZIG-ZAG SHAPED TUBES
    (Vinca Inst Nuclear Sci, 2023) Korti, Mohammed Choukri; Youcef, Ahmed; Akgul, Ali; Alwan, Adil Abbas; Mohsen, Karrar S.; Asad, Jihad; Jarrar, Rabab
    This study aimed to investigate the thermal behavior of water flows in a solar collector equipped with zig-zag tubes. To achieve this, a numerical simulation using CFD was conducted, which is a powerful tool for analyzing fluid-flow and heat transfer. The simulation employed the finite volume method to discretize the fluid domain and the SIMPLE algorithm to solve the pressure-velocity coupling. The simulation results indicated that the shape of the tubes significantly influenced the flow behavior and overall performance of the solar collector. Specifically, the temperature profiles at various times of the day showed that zig-zagshaped tubes enhanced the heat transfer coefficient, resulting in higher temperatures within the collector. Moreover, the zig-zag design increased the residence time of the fluid inside the collector, further improving its overall efficiency. These findings highlight the potential of utilizing zig-zag-shaped tubes to optimize the performance of solar water heating systems, which could have important implications for renewable energy applications.