Abstract
Electronic devices have been mainly relying on passive heat exchangers to transfer heat away for preventing catastrophic thermal runaway. However, the passive heat exchangers usually provide limited cooling capacity due to spatial limitations of the target systems. In this paper, an active heat exchanging system, based upon MHD pumping principle for driving electrically conducting coolant without utilizing mechanical moving-parts, was studied and experimentally verified. Governing equations of electrically conducting liquids driven by the Lorentz forces were derived by assuming steady state, incompressible and fully developed laminar flow conditions. Furthermore, numerical simulations were conducted with the explicit Finite-Difference Method to evaluate the performance of the heat exchanger. Finally, an experimental apparatus was built for measuring the flow velocity of coolant and the associated total cooling capacity. A significant flow velocity of 1.09×10 2 mm/s at 3 Ampere applied current was observed when the magnetic flux density was kept at 0.4 Tesla. The experimental results concluded that the heat exchanger consumed very low electric power; hence, the cooling system is very promising for applications in micro-fluidic systems.