IEEE Central Coast - 21 Oct @ 6:30 - Microscale Thermal-Fluids Engineering Next Generation Energy

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Professor Yangying Zhu Ph.D. – UCSB ME Presents: “Microscale Thermal-Fluids Engineering for Next Generation Energy and Electronics Systems


Greetings,

  1. 1. Please REGISTER for EVENT Below NOW.
  1. Use link below to access Zoom on October 21 @ 6:15PM - 6:30PM.

https://ucsb.zoom.us/j/97082355848?pwd=MllINC9rU3VRRjFIMWIrMGt2TnMvUT09  

Professor Zhu's timely talk involves her Research that focuses on using thermo-fluid engineering approaches for future electronics and sustainable energy solutions. Her research combines fundamental understanding in heat and mass transfer with novel materials fabrication and characterization capabilities to address thermal management challenges of electronic devices, batteries, and electrocatalytic systems.

Best regards, Ruth Franklin IEEE Central Coast Chair



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  • Date: 21 Oct 2020
  • Time: 06:30 PM to 08:00 PM
  • All times are (UTC-08:00) Pacific Time (US & Canada)
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  • Starts 17 October 2020 03:56 PM
  • Ends 21 October 2020 06:00 PM
  • All times are (UTC-08:00) Pacific Time (US & Canada)
  • No Admission Charge


  Speakers

Dr. Yangying Zhu Dr. Yangying Zhu of UCSB ME

Topic:

Microscale Thermal-Fluids Engineering for Next Generation Energy and Electronics Systems

 

Effective management of heat has become a critical challenge in many energy and electronic applications due to the increasing power density and shrinking length scales. For example, next-generation lithium-based batteries for electric vehicles are designed to be charged at ~10 times of the electric current used now, which means ~100 times higher joule heating; high-performance gallium nitride based power electronic devices require heat dissipation of ~1000 W/cm2 , which is 1/6 of the heat flux at the surface of the Sun. Improving the thermal performance of these systems is necessary to ensure safe and efficient operations and requires manipulating the heat and fluid transport at the microscopic length scale. In this talk, I will discuss how we can leverage micro-scale modeling, fabrication and characterization capabilities to provide new insight into thermal effects in lithium-based batteries and achieve aggressive cooling of electronics. First, I will discuss the discovery of a microscopic heat-triggered battery failure mechanism through in situ local temperature sensing using micro-Raman spectroscopy and a novel graphene transducer. The high spatial resolution and the in situ capability enabled direct observation of the correlation between local temperature hotspot and accelerated Li growth, which led to internal shorting of the Li battery. Second, I will describe the development of a two-phase microchannel heat sink that significantly enhanced temperature stability and achieved a 60% enhancement in the heat flux dissipation for electronics. These improvements

were realized through integrating micropillar structures into microchannels, which are optimized with thermo-fluid modeling to maximize capillary wicking. These examples demonstrate the potential of combining fundamental thermo-fluid science and advanced micro/nano engineering approaches to address many of the pressing thermal challenges in next generation energy and electronic systems.

Biography:

Yangying Zhu started as an assistant professor in the Mechanical Engineering department at University of California, Santa Barbara in July 2019. Her work focuses on advanced thermal management and characterizations of energy and electronic systems. She obtained her PhD from MIT, advised by Prof. Evelyn Wang, where she developed microsystems for aggressive cooling of electronics. During her postdoc with Prof. Yi Cui at Stanford University, she investigated thermal effects in lithium-based batteries. She received the Meredith Kamm Memorial Award for Outstanding PhD Thesis and the graduate Women of Excellence Award from MIT.

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