Nonlinear thermomechanical finite-element modeling, analysis and characterization of multi-turn oscillating heat pipes
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[ACCESS RESTRICTED TO THE UNIVERSITY OF MISSOURI AT REQUEST OF AUTHOR.] Oscillating heat pipes (OHPs) are promising heat dissipation devices for modern electronic systems due to their high heat transfer rate, simple construction and low manufacturing cost. Influential factors of the OHPs include the operating temperatures of the evaporator and condenser, heating mode (bottom or top heating), diameter of the capillary tube, number of turns, physical properties of the working fluid, and others. This thesis develops a fully nonlinear thermomechanical finite-element model of oscillating heat pipes that can accurately predict the oscillation frequency and calculate the time-varying spatial distributions of temperature and motion of fluid and vapor slugs and the global heat transfer efficiency. The model accounts for the influences of nonlinear spring effect of vapor slugs, mass transferring effect, fluid filling ratio, operating temperature, gravity, bending pressure loss, temperature difference between the evaporator and condenser, capillary tube diameter, properties of the working fluid, collapse of vapor slugs, and different random distributions of initial velocities and lengths of fluid slugs.
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