[PDF] from ieee.org Heat Transfer Enhancements at Low-Pressure for Electromechanical Actuators

In aerospace applications, the electronic components of aircraft must endure drastic changes in ambient conditions. The changes in ambient vary from 101.325kPa to approximately 20% and 30% of the atmospheric condition at cruising altitude. Electromechanical actuators (EMAs) analyzed in the current work generate heating loads of up to 1000W of heat for a cylindrical volume of 6.95×10 5 mm 3 . Coupling the high-altitude effects with the thermal loads requires innovative cooling schemes to ensure that EMA operates at feasible temperatures at any point during its function. The effects of radiation and convection are analyzed to determine the dominant mode of heat transfer for maximum heat dissipation. CFD was used as a tool to examine the various conditions and parameters in the current paper. Increasing Re enhances the cooling capacity drastically by lowering the maximum temperature by 40% but is …