| Summary: | 碩士 === 國立清華大學 === 動力機械工程學系 === 88 === The objective of this study is to design and analyze an electromagnetic valve for liquid metal application. Based upon the Lorentz force for pushing and breaking the liquid metals which is generated by orthogonal electric and magnetic fields, an experimental equipment has been established for measuring and verifying the parameters for electromagnetic control. In this study, Gallium is employed for the liquid metals, whereas electric currents and magnetic fields are controlled for simulating the process of controlling liquid metals. First, finite element program has been employed for finding the shape of the magnetic circuits; which leads to the double-side squeezing electromagnets for amplifying the magnetic field. Besides, the distribution of the electric current field in the liquid metals has been simulated with various shapes and materials with the results that material conductivity is the most important factor for current distribution. Finally, two different types of electromagnetic flow control valve are built for both static force and dynamic flow measurements. The narrow slit valve can achieve complete blockage-state while the circular pipe valve needs to be changed to a ring-shape valve for better flow control while electric current must be larger for the complete blockage-state.
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