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줄 발열에 의한 온도기울기 농축을 위한 미세채널 형상 최적화
한태헌(Taeheon Han),김선민(Sun-Min Kim) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
A temperature gradient focusing (TGF) via Joule heating phenomenon was numerically studied. The governing transport equations are implemented into a quasi-1D numerical model to predict the resulting temperature, velocity, and concentration profiles along a microchannel of varying width under an applied electric field. The model is used to analyze the effects of varying certain geometrical parameters of a microchannel on the focusing performance of the device. We show the effects of varying width of the microchannel having a fixed length, and propose the optimal geometry of the device. This method can be easily implemented into lab-on-a-chip (LOC) applications where focusing is required based on its simple design.
시뮬레이션을 활용한 진동에 의한 엔진룸 정션블록 릴레이 발열에 관한 연구
양승민(Seungmin Yang) 한국자동차공학회 2019 한국자동차공학회 학술대회 및 전시회 Vol.2019 No.11
In this paper, a simulation method for pre-verifying the temperature rise of junction block relays due to vibration is studied. The causes of relay temperature rise were analyzed based on the results of several tests. As a result of the test analysis, the main cause of the relay temperature rise was found and the simulation process was defined. The simulation was carried out in four phases, followed by vibration, structure, joule heating, and frictional heat analysis. In phase 1, the relay predicted high temperature rise was selected through vibration analysis, and phase 2 the assembly shape and contact pressure were confirmed through structural analysis. In phase 3, the initial temperature rise of the relay was confirmed by the electric-thermal coupling analysis. In phase 4, frictional heat analysis was performed to check the relay temperature rise due to vibration. The error of simulation and test result was 0.39 ℃, and the simulation result was similar to the test result.
한태헌(Tae Heon Han),김선민(Sun Min Kim) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
We present a theoretical and experimental study of temperature gradient focusing(TGF) exploiting an inherent Joule heating phenomenon. High electric potential applied to the device induces a temperature gradient within the microchannel due to its variable-width geometry, and the temperature-dependent mobility of analytes causes focusing at a specific location.