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윤정훈(Jung Hoon Yun),정지환(Ji Hwan Jeong) 대한설비공학회 2015 대한설비공학회 학술발표대회논문집 Vol.2015 No.11
Two-phase cooling strategy is efficient method to deliver the heat. Many cooling applications have been using this to meet the demands for high thermal performance and compact designs. Small flow channels are used in compact heat exchangers. Thermal system design of such equipment requires understanding about two-phase pressure drop to improve the performance of the system. There are various approach method to predict the two-phase frictional pressure drop and that can be classified into four types. There are HEM, SFM, direct empirical correlation and flow pattern specific correlation. In order to evaluate the accuracy of existing models and correlations, a broad range of experimental data is collected. The database consist of 933 and 1304 frictional pressure drop data for condensing and boiling flow, respectively, from 14 sources. Among the viscosity models, Cicchitti et al’s viscosity model provides the best predictions. In general, Muller-Steinhagen and Heck’s correlation provide good predictions for both conventional channels and minichannels.
양자역학 전산모사를 통한 아조벤젠의 전자들뜸 확률 계산
윤정훈(Jung-Hoon Yun),조맹효(Maenghyo Cho) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.11
Azo-benzen is well known for its photo-isomerization, which induces large deformation in azo-benzen liquid crystal plate. In this paper, we will suggest a modeling method to predict first excited state of azo-benzen molecule, which is the first step in modeling over all process of photo-isomerization of azo-benzen. By using DFT calculation, we calculate dipole moment in both ground state and excited state of azo-benzen, and connected them with phonon modeling equation. Under additional assumptions, we derive probability of photo-induced electron excitation in azo-benzen molecule.
경사적층 기법을 활용한 wavy 연신배선의 교차 적층 해석과 효율 검증
윤정훈(Jung-Hoon Yun) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
Cross deposition of wavy circuit is crucial structure in fabricating flexible device matrix. In this study, cross-deposition of the wavy circuit is studied. By comparing maximum stretch ratio of wavy circuits with different tilting angle, stretch efficiency between plane wavy circuit and tilted one are compared. Both finite element analysis and experimental study reveals that tilted wavy circuit still has predominance in maximum stretch ratio of wavy circuit.