Inspire ME
Join us for a special guest speaker!
Increasing the efficiency and reducing the environmental footprint of energy systems
February 10, 2022Â –Â 3:00-4:15 PM in MEC 114
After reviewing past research on vapor compression technologies (e.g., refrigerant-lubricant absorption-desorption in CO2 systems, counter-current flow condensation, and heat exchanger optimization), my presentation will include some design aspects of emerging solid-state refrigerators and new applications in electronics cooling.
A recently developed spray-based heat sink integrated with an oil-free small-scale compressor provides a unique combination of high heat transfer coefficients and below-ambient evaporating temperatures, making it ideal for high heat flux applications. The talk explores the coefficient of performance and compressor power behavior in conjunction with boiling curves for plain and microstructured surfaces. Interactions between impinging droplets and the liquid film are investigated up to the critical heat flux, leading to more accurate prediction methods.
Another application involves the design of ultra-deepwater high-power electronics enclosures, where pressure compensation and no moving parts are critical design requirements. Analytical methods, numerical tools, and lab tests in scaled-down prototypes were combined to determine the enclosure geometry yielding the maximum heat dissipation rate per unit dielectric fluid volume.
Finally, I will present an update on Magnetic Refrigeration, an internally reversible solid-state technology based on regenerative thermodynamic cycles to pump heat via magnetic work. After introducing the basic transfer processes in active magnetic regenerators, some challenges of designing, commissioning, and testing a compact magnetic wine cooler prototype are presented together with a comprehensive performance assessment.
About the presenter
Jader R. Barbosa, Jr. was awarded a Ph.D. in Chemical Engineering from Imperial College London, UK. His academic interests cover the areas of Fluids Engineering and Thermal Sciences, with an emphasis on Thermodynamics of Mixtures, Phase Change, Multiphase Flows, Enhanced Heat Transfer, and Emerging Cooling Technologies.
Dr. Barbosa has published more than 300 scientific papers in indexed journals and international peer-reviewed conferences and has advised/co-advised 45 theses/dissertations. He is a member of the Scientific Council of the International Center for Heat and Mass Transfer (ICHMT) and President of the Assembly of World Conferences on Experimental Heat Transfer, Fluid Mechanics and Thermodynamics (ExHFT).
In 2017/2018, Dr. Barbosa was a Fulbright Visiting Professor at the School of Mechanical, Industrial and Manufacturing Engineering at Oregon State University. He is currently the Editor-in-Chief of the Journal of the Brazilian Society of Mechanical Sciences and Engineering (Springer) and Subject Editor of Applied Thermal Engineering (Elsevier).