Browsing by Author "Muteti, Winfred Wandia"

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    Thermal Applications of Carbon Nanotubes in Polyethylene Glycol in The Presence of Magnetic Field on Electronic Devices
    (Kenyatta University, 2025-06) Muteti, Winfred Wandia
    In this study, the thermal management of electronic devices, specifically Central Processing Units (CPUs), using carbon nanotubes (CNT) dispersed in polyethylene glycol (PEG-400) under the influence of a magnetic field was studied. The research optimized cooling performance by enhancing efficiency, extending the operating temperature range, and improving the reliability of such systems. The study modeled impingement cooling using a Darcy-Brinkman-Forchheimer approach and considered the effects of viscous dissipation. The governing nonlinear partial differential equations were converted into nonlinear ordinary differential equations (ODEs) by utilizing similarity variables and solved using MATLAB’s bvp4c. CNT-PEG-400 nanofluid flowing via a porous metal foam CPU cooler with a fan and a heated CPU surface was simulated. The investigation of key parameters like Hartmann number, Reynolds number, Darcy number, and porosity revealed that increasing the Darcy number significantly enhances heat transfer. The Hartmann number’s effect varies with porosity, where stronger magnetic fields are advantageous for highly porous metal foams, ultimately improving cooling efficiency. CNTs increase both the density and viscosity of PEG-400, leading to enhanced heat transfer characteristics, which improve overall cooling performance. These findings contribute to optimizing cooling strategies for CPUs and other electronic devices, especially when using CNT-PEG-400 nanofluids in the presence of magnetic fields.