Author: 공과대학 교학팀

Recent advancements in the synthesis of carbon nanotubes

Recent advancements in the synthesis of carbon nanotubes   Jaegeun Lee School of Chemical Engineering, Pusan National University, Busan, Republic of Korea, 46241 jglee@pusan.ac.kr   Carbon nanotubes (CNTs) are one of the earliest nanomaterials that opened up the era of nanotechnology about 30 years ago. During the past three decades, the...

High-fidelity Flow Simulation for Turbomachinery

High-fidelity Flow Simulation for Turbomachinery   Jin Lee (Department of Mechanical Engineering, Dong-A University)   Abstract For energy conversion between thermo-fluid and mechanical energy, turbomachinery is widely used, from air purifiers, wind turbines to airplane engines. Airplane engines, in particular gas-turbine engines, are complicated systems combined with multiple turbomachinery components. Here, the performance of turbomachinery is based on fluid mechanics and thermodynamics, and durability is based on thermodynamics and solid mechanics. In order to reduce total development cost amid increasing computing resources and techniques, aero-thermal simulation and analysis are getting critical. Computational fluid dynamics (CFD) in this research field have been used to solve numerous issues related to the multi-disciplinary analysis in gas-turbine engines. Nowadays, more effort has been added to improve the fidelity of the computation by resolving turbulence. Also, machine learning helps the accuracy of the regular-fidelity simulation. Based on the background, this presentation focuses on several examples of CFD researches in the turbomachinery industry. After giving an overview of the CFD research for gas-turbine engines, (i) large-eddy simulation (LES) of compressor cascade and (ii) hybrid RANS/LES simulation for multi-stage turbine will be presented. Finally, the future of the gas turbine engine will be introduced briefly.     Bio Jin LEE is an assistant professor at Dong-A University (DAU), Busan, South Korea. He received his Ph.D. degree from KAIST in 2014, and received the outstanding dissertation award in 2015 from the Korean Society of Mechanical Engineers (KSME). Before joining DAU, he investigated the transitional boundary layer at Johns Hopkins University as a postdoctoral fellow (2014-2017). Then, he joined Raytheon Technologies Research Center (formerly, United Technologies Research Center (UTRC)) as a research engineer, and contributed for aerodynamics and acoustics in turbo-fan engines and hypersonic missiles (2017-2021). His research area encompasses the direct numerical simulation (DNS) of complex flows to the RANS/LES simulation of the turbomachinery flow....

Status of the microbial CO2 electrobiorefinery and related challenging issues

차세대 극자외선 노광기술 시대의 포토레지스트, 펠리클, 3차원 마스크 계측 검사 기술과 초미세 패터닝

Actinic imaging research using synchrotron for the high-NA EUV era : EUV patterning, pellicle metrology and 3D mask inspection     Even though the key photolithography process for minimizing feature size of semiconductor is moving closer to EUV Lithography, there are still numerous hurdles to overcome for the new...

정책이란 무엇인가?-원자력 정랙 및 안전정책-

Microscopic investigation of model catalyst systems using STM: from a single molecule to nanostructures

Microscopic investigation of model catalyst systems using STM: from a single molecule to nanostructures Hyun Jin Yang, Ph. D. hyunjin.yang@lgensol.com , hyunjin.yang@gmail.com Surface analysis team, Center for Analytical Sciences, LG Energy Solution Heterogeneous catalysis has been a long-standing subject of surface chemistry, employing the elements of heterogeneous catalysts, i.e....