奈米工程與微系統研究所　書報討論

Seminar of Inst. NanoEngineering and MicroSystems

Ming-Chang Lu

Mechanical Engineering department

National Chiao Tung University

Associate Professor

Micro/Nano Structures for Enhanced Heat Transfer and Energy Storage

Abstract:

Approximately 90% of the world’s total power is generated by converting thermal energy into mechanical and/or electric power. Thus, to address energy security, we must look at the science and engineering of thermal energy. This talk focuses on using micro/nano structures to enhance thermal energy transfer and storage in different thermal energy systems.

Condensation plays an essential role in various thermal systems. Condensation which involves heterogeneous nucleation, growth, and departure of liquid droplets is intrinsically a random process. Here, we report the ability to spatially control heterogeneous nucleation on a superhydrophobic (SHB) silicon nanowire array-coated surface. The control is achieved by manipulating the free energy barrier to nucleation through parameterizing regional roughness scale on the Si nanowire array-coated surface. Moreover, a closed system was built to investigate the heat transfer performance on the SHB silicon nanowire array-coated surface.. The insight learned from this study could pave a way to develop surfaces with enhanced mass and heat transfer rates.

Amorphous materials are generally regarded as thermal insulators. Here, we report that amorphous polymer nanofibers can exhibit a very large thermal conductivity, e.g., 56 Wm-1K-1. This value is one of the highest reported values for polymers The finding renovates our knowledge of poor heat transfer within amorphous polymers. The very large heat transfer associated with the amorphous polymer enables it being applied in enhancing heat transfer in many systems, such as electronic packaging, LED, solar panels, and heat exchangers

15:30-17:20 on Nov. 20(Mon), 2017 at Room 108 of Eng. Building I

Host：Prof. Chao-An Lin calin@pme.nthu.edu.tw Ext:42607

Contact：Praveen praveenbowler@gmail.com  Mobile: 0909537757

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