Thermal management is a key challenge in modern electronics and aerospace engineering, where spatial constraints and high heat flux densities demand advanced solutions. A thermal switch enables controlled heat transfer. In the ON state, heat flows from the source to the sink, while in the OFF state the heat flux is interrupted. In this thesis, we experimentally analysed the characteristics of a ferrofluid thermal switch (FTS), in which heat transfer occurs through a ferrofluid droplet with high thermal conductivity. The switch is turned ON when the droplet establishes a thermal connection between the heat source and the heat sink and turned OFF by withdrawing the droplet. Through a parametric experimental analysis of the conductive track width and the gap width between the tracks, we determined the optimal conditions for achieving the maximum switching ratio. The highest measured value of 30 confirms the efficiency and reliability of the proposed concept and indicates a significant potential for the application of FTS in thermal engineering. When interpreting the results, it should be noted that the measurements were conducted under controlled laboratory conditions, which are generally not achievable in real-world applications; therefore, the switching ratio obtained in practice will likely be lower than that measured in the laboratory.
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