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이대형(Daehyeong Lee),채장범(Jangbom Chai),조병남(Byeongnam Jo) 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.12
In this study, specific heat capacity of binary molten salt-based graphite nanofluids was experimentally measured for two different salt mixtures: nitrate salt mixtures and carbonate salt mixtures. The graphite nanoparticles were doped into each salt mixtures to synthesize the high temperature nanofluids. The specific heat capacity of the nanofluids was measured by a differential scanning calorimetry in both solid phase and liquid phase. To examine the effects of solute (graphite nanoparticles) and solvent (molten salt mixtures), the concentration of the nanoparticles was varied from 0.1 to 1.0 wt. %, and three different chemical compositions of salt components for each salt mixture were employed including eutectic composition. In results, the specific heat capacity of the carbonate salt mixtures was drastically enhanced up to 17.1 %, whereas the specific heat capacity of the nitrate salt mixtures was decreased to 15.9 % in maximum. These distinct results were explained by formations of nanoparticle-induced nanostructures and compressed liquid layer using scanning electron microscope and molecular dynamics simulations, respectively.
조병남(Byeongnam Jo),이대형(Daehyeong Lee),이재준(Jaejun Lee) 대한설비공학회 2020 대한설비공학회 학술발표대회논문집 Vol.2020 No.6
Molten salts are widely used for high temperature thermal energy storage applications such as concentrating solar power (CSP) plants, because of their low vapor pressure, high thermal stability, and low cost. However, their corrosive feature prevents the usage in various fields. In this study, molten salt microcapsules were synthesized on the basis of the water limited sol-gel method, in which potassium nitrate (KNO₃) and sodium nitrate (NaNO₃) were encapsulated in silica (SiO₂) shells. Two different encapsulation techniques were applied for each of salts. For the KNO₃ microcapsules, a surfactant was used whereas no surfactant was used for the microencapsulation of the NaNO₃. For the characterizations of the molten salt microcapsules synthesized in this study, a differential scanning calorimetry and scanning electron microscope (SEM) were employed to measure thermal properties of the microcapsules, to estimate the encapsulation ratio and to examine the morphological characteristics of the microcapsules. In results, high encapsulation ratio up to 89 % was obtained for both microcapsules. Additionally, the nominal sizes of the KNO₃ and NaNO₃ microcapsules were observed to be 15 and 8 ㎜, respectively, based on SEM images.
Step Input Test를 통한 차량 거동 Mechanism 및 Rolling 거동 분석에 대한 연구
이준모(Joonmo Yi),박준홍(Joonhong Park),이대형(Daehyeong Lee) 한국자동차공학회 2004 한국자동차공학회 Symposium Vol.- No.-
Find out the mechanism of vehicle motion is required effective development of handling performance. In this study, force of tire and displacement of wheel and many other parameters are measured when steered on step. Therefore it was found that vehicle respond sequentially. And Roll Mode Index is applied for evaluating roll motion for representing the feel ing test correctly.<br/> <br/>