By: Bangshidhar Goswami
Ex-Assistant Professor, Department of Metallurgical Engineering, Ran Vijay Singh College of Engineering and Technology, Jamshedpur, East-Singhbhum, Jharkhand, India.
This study investigates the magnetothermoelectric effects, specifically the Ettingshausen effect, in graphene nanoribbons and iron-carbon alloys and explores their implications in plasma physics through self-similar modeling. The Ettingshausen effect, which involves the generation of a transverse heat current from a longitudinal charge current in the presence of a magnetic field, is analyzed using the Landauer-Büttiker formalism and nonequilibrium Green’s function methods. Results reveal that in graphene nanoribbons, the Ettingshausen effect is highly sensitive to device parameters in weak magnetic fields and shows a strong dependence on the Fermi energy, with significant oscillations observed when the Fermi energy deviates from the Dirac point. Additionally, the study examines the application of magneto-inertial fusion techniques to plasma, where magnetic fields are employed to suppress heat loss and trap alpha particles. Self-similar solutions to the extended Magnetohydrodynamics (MHD) equations reveal the critical roles of the Nernst and Ettingshausen effects in these high-energy environments. Furthermore, the anomalous Ettingshausen effect (AEE) in iron-carbon alloys, including cast irons and steel, is explored, demonstrating that these materials exhibit significantly enhanced thermoelectric properties compared to pure iron, with potential applications in thermal management technologies. This work provides new insights into the behavior of magnetothermoelectric phenomena in advanced materials and their potential for applications in energy conversion and plasma physics.
Citation:
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