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김덕종,김재윤,박상진,허필우,윤의수,Kim, Deok-Jong,Kim, Jae-Yun,Park, Sang-Jin,Heo, Pil-U,Yun, Ui-Su 한국기계연구원 2003 硏究論文集 Vol.33 No.-
In this work, thermal design of a PCR chip for LOC is systematically conducted. From the numerical simulation of a PCR chip based on the finite volume method, how to control the average temperature of a PCR chip and the temperature difference between the denaturation zone and the annealing zone is presented. The average temperature is shown to be controlled by adjusting heat input and a cooler as well as a heater is shown to be necessary to obtain three individual temperature zones for polymerase chain reaction. To reduce the time required, a heat sink for the cooler is not included in the calculation domain for the PCR chip and heat sink design is conducted separately by using a compact modeling method, the porous medium approach.
Evaluation of Micro Mixers using Competing Reactions
김덕종,박상진 한국바이오칩학회 2007 BioChip Journal Vol.1 No.3
In this study, two micro mixers were fabricated and tested using a system of parallel competing reactions involving the Dushman reaction between iodide and iodate, coupled with neutralization. Using competing reactions allowed the influence of the operating conditions and microstructure on mixing performance to be investigated. The results of this study revealed that the degree of mixing was improved as the flow rate through the mixer increased, which is consistent with existing experimental data obtained using conventional optical techniques. This study also demonstrated that the mixing performance could be enhanced by changing the inlet shape of the mixing chamber. Numerical simulations conducted to determine why the change in inlet shape enhanced the mixing performance indicated that mixing performance is dependent on the degree of impingement and the circulation flow, which are dominated by the flow rate and the inlet shape of the mixing chamber, respectively.
다공성 매질과 비투과성 벽면 사이의 경계면에 대한 열적 경계 조건
김덕종,김성진,Kim, Deok-Jong,Kim, Seong-Jin 대한기계학회 2000 大韓機械學會論文集B Vol.24 No.12
The present work investigates a heat transfer phenomenon at the interface between a porous medium and an impermeable wall. In an effort to appropriately describe the heat transfer phenomenon at the interface, the heat transfer at the interface between the microchannel heat sink, which is an ideally organized porous medium, and the finite-thickness substrate is examined. From the examination, it is clarified that the he heat flux distribution at the interface is not uniform for the impermeable wall with finite thickness. On the other hand, the first approach, based on the energy balance for the representative elementary volume in the porous medium, is physically reason able. When the first approach is applied to the thermal boundary condition, and additional boundary condition based on the local thermal equilibrium assumption at the interface is used. This additional boundary condition is applicable except for the very th in impermeable wall. Hence, for practical situations, the first approach in combination with the local thermal equilibrium assumption at the interface is suggested as an appropriate thermal boundary condition. In order to confirm our suggestion, convective flows both in a microchannel heat sink and in a sintered porous channel subject to a constant heat flux condition are analyzed. The analytically obtained thermal resistance of the microchannel heat sink and the numerically obtained overall Nusselt number for the sintered porous channel are shown to be in close agreement with available experimental results when our suggestion for the thermal boundary conditions is applied.