Thermally Induced Fiber Deformation Using High Frequency Magnetic Field

This paper presents a model to externally induce deformation of a fiber inside a human lung. The fiber contains ferromagnetic materials and has a cross-section of sub-micron size. The fiber heating is achieved by applying an external high frequency magnetic field to induce eddy currents in the ferromagnetic materials. Prediction of the thermal bending of the fiber requires multi-physics modeling. The electromagnetic energy deposition is calculated by constructing models using a finite element method. The deposited energy is coupled to a heat-transfer model to calculate the temperature rise. The distribution of temperature inside the fiber then allows prediction of fiber deformation. This is the first attempt to use thermal heating induced by a high frequency oscillatory magnetic field to cause deformation of a fiber.