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이재빈(Jaebeen Lee),박임봉(Linfeng Piao),박형민(Hyungmin Park) 대한기계학회 2022 대한기계학회 춘추학술대회 Vol.2022 No.11
This study investigated the viscosity of low sulfur fuel oil (LSFO) using bench-scale experiments and analyzed the effects of emulsion and evaporation on it. The results show the dependency of LSFO on the temperature, which follows the William-Landel-Ferry law. The emulsion test found that the meso-stable emulsion whose viscosity is 10-100 times larger than the normal one was achieved. Evaporation of LSFO due to initial temperature is found to be so small that its effect on oil properties is negligible in the present study. In addition, we experimentally examined the spreading features of LSFO on the water surface in the circulating water bath in which the wind speed, water temperature, and initial oil volume are controlled as 2-5 m/s, 5-25 ℃, and 100-400 ml, respectively. The spreading speed rapidly increased after a critical viscosity (~500 cP) due to the balance break between the viscosity retarding force and wind shear stress.
이재빈(Jaebeen Lee),박임봉(Linfeng Piao),박형민(Hyungmin Park) 대한기계학회 2022 대한기계학회 춘추학술대회 Vol.2022 No.11
This study investigated the viscosity of low sulfur fuel oil (LSFO) using bench-scale experiments and analyzed the effects of emulsion and evaporation on it. The results show the dependency of LSFO on the temperature, which follows the William-Landel-Ferry law. The emulsion test found that the meso-stable emulsion whose viscosity is 10-100 times larger than the normal one was achieved. Evaporation of LSFO due to initial temperature is found to be so small that its effect on oil properties is negligible in the present study. In addition, we experimentally examined the spreading features of LSFO on the water surface in the circulating water bath in which the wind speed, water temperature, and initial oil volume are controlled as 2-5 m/s, 5-25 ℃, and 100-400 ml, respectively. The spreading speed rapidly increased after a critical viscosity (~500 cP) due to the balance break between the viscosity retarding force and wind shear stress.
이재빈(Jaebeen Lee),박임봉(Linfeng Piao),박형민(Hyungmin Park) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
The rheological behavior of LSFO (low sulfur fuel oil) has been issued after the IMO (International Maritime Organization) restricted the sulfur percentage of marine oil as below as 0.5%. Therefore, to cope with the oil-spill accident in the marine environment, the characteristics of LSFO should be known to establish the strategy dealing with preventing the dispersion of LSFO and removing them. In this paper, based on the viscosity of LSFO (available from the domestic companies) at the temperature range of 4-50℃, its dispersion characteristics were analyzed in the water flume experiment, by varying the shear rate, i.e., wind speed over the water surface. The viscosity was modeled as function of temperature using WLF law and transition temperature of LSFO was found. The actual marine oil-spill condition was mimicked with the wind speed of 3-7 m/s, 5-25℃ of water temperature, with the added volume of oil of 100-200 ml. In addition to the variation of viscosity with temperature, we measured the pattern of oil dispersion over the water surface, which was processed to obtain the dispersion coefficient as a function of shear rate and viscosity (i.e., temperature) of LSFO.
윤형준(Hyeongjun Yun),김예원(Yewon Kim),이재빈(Jaebeen Lee),박형민(Hyungmin Park) 대한기계학회 2023 대한기계학회 춘추학술대회 Vol.2023 No.11
Clogging in porous media by particles is a topic that has been widely studied in the field of engineering. In this study, the clogging phenomenon is examined by passing water mixed with sand through a filter and observing the pressure difference over time. In our experiment, it was confirmed that the differential pressure was formed around 71 ㎪ when a 140 LPM pump and a pore size 8 ㎛ filter with 25 ㎜ thickness were used. The differential pressure increased rapidly at the beginning, and it converges to a certain value as time passes by. The strong pump blocked the filter as sand flowed in quickly, and it could be interpreted that the differential pressure gauge gradually converged to a constant value as it saturated. In the future, after a lot of experimental data is secured, it will be possible to predict the differential pressure value over time through LSTM (Long Short-Term Memory).