• 유변학
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• 제2권1호
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• pp.60-66
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• 1990

혼합공정은 화학공학, 식품공학, 건축공학등 여러 가지 산업분야에 걸쳐 이용되는데 최근 고분자 분야에서도 신소재 개발 또는 제품의 물성을 향상시키기 위하여 이에대한 연구 가 활발해지고 있다. 고분자 가공에서 혼합에 이용되는 대표적인 기계로는 twin screw extruder, internal mixer, two roll mill 등이 있는데 본 연구에서는 internal mixer에서의 고 분자 유동 및 혼합거동을 파악하고자 하였다. 실험적으로는 flow visualization 방법을 써서 순환시간을 측정하였고, 시뮬레이션을 통하여 이론적으로 이를 검토하였다. 고분자 거동은 비뉴우톤을 유체로서 설명되기 때문에 본 연구에서는 혼합기의 구조적 특성을 고려한 모델 로서 $\eta$ = $\frac{\eta_o}{1+A[2trd^2]^\frac{1-n}{2}}$

• Elastomers and Composites
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• 제45권3호
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• pp.223-229
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• 2010

가공기기의 기하학적 구조(geometry)가 실리카 분산에 대해 미치는 영향을 알아보기 위해서 롤밀(two roll mill)과 밀폐식 혼합기(internal mixer)를 사용하여 실리카가 충전된 부틸고무 가황물을 제조하여 가황특성, 인장특성 및 실리카 분산을 비교하였다. 가공 시, 롤밀을 사용하여 제조한 배합물은 밀폐식 혼합기를 사용하여 제조한 배합물보다 경화 속도($t_{90}$)는 약간 느렸으나, 긴 유도시간($ts_2$), 높은 최대 토크 값($T_{max}$)을 보였다. 또한 롤밀을 사용하여 제조한 배합물은 실리카 입자의 분산 및 기계적 물성의 특성에 있어서 밀폐식 혼합기를 사용했을시 보다 상대적으로 우수함을 보였다.

• Nuclear Engineering and Technology
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• 제52권1호
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• pp.170-177
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• 2020

A mixer with a new concept design has been adapted into water treatment plants. It reportedly cuts down the energy consumption of the mixer by the new mixer, which moves vertically and creates internal flows toward its bottom. However, no experimental observations have been made on the internal flow caused by a vertical impeller. In this study, a radiotracer experiment, radioactive particle tracking (RPT) technique, and particle image velocimetry (PIV) were carried out to visualize the flow in the mixer, and compared to each other. The results show that the flow patterns from these techniques are very similar to each other, and the performance of the mixer was good enough to mix the inner materials.

• 대한기계학회논문집B
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• 제33권3호
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• pp.149-155
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• 2009

In this work a numerical study to find the characteristics of the internal flow and mixing process has been conducted in a static mixer used in the system of catalytic combustor of the fuel cell power plant. After introducing the model description and final governing equations the present numerical approach is applied to the analysis of static mixer, which may have one or more helical elements inside the circular tube by changing such various parameters as incoming mass flow rates and the number of helical elements. The results show that although the static mixer is efficient in mixing fuel and air, more optimization processes are required to achieve the appropriate mixing characteristics in front of the honeycomb type catalytic combustor used in the MCFC power plant

• 펄프종이기술
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• 제35권1호
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• pp.1-6
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• 2003

This study was carried out to investigate the effect of internal fibrillation on the pulp and paper properties. The internal fibrillation was introduced into the SwBKP and recycled SwBKP by the mechanical treatment with Hobart mixer. WRV and physical properties of SwBKP were improved by the internal fibrillation. However the mechanical treatment of recycled SwBKP resulted in the decrease of strength properties of paper except for the tear index, although it was observed that WRV was somewhat increased by the mechanical treatment. The decrease of strength properties of recycled SwBKP might be caused by the hornification of fiber and the decrease of fiber strength.

• Elastomers and Composites
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• 제30권2호
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• pp.122-142
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• 1995

• 한국고분자학회지:고분자과학과기술
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• 제2권4호
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• pp.250-256
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• 1991

• 유변학
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• 제2권2호
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• pp.28-34
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• 1990

최근 고분자 산업의 발달과 함께 고분자 혼합공정에 대한연구와 더불어 internal 혼 합기에 대한 관심이 고조되어 왔다. 본문에서는 효율적인 로우터 고안을 위하여 수학적 모 델을 이용하는 computer aided design을 다루었다. Computer aided design 하기 위하여 고 려된 인자는 유변학적 성질, 작업조건, 로우터의 형상이었으며 고안된 혼합기의 평가는 로우 터 날에서의 응력과 순환시간을 사용하였다.

• 한국유체기계학회 논문집
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• 제18권3호
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• pp.20-25
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• 2015

In this study, there are 6 mixers that are installed in a 600,000 barrel tank. We identified internal flow characteristics of floating roof tank with varying the number of operation from 4 to 6 because mixer is a variable that influence flow characteristics of the tank. And while varying an angle from Right $60^{\circ}$, Right $30^{\circ}$, Left $30^{\circ}$ to Left $60^{\circ}$, we identified internal flow characteristics of the tank. As a result, maximum velocity of flow was 0.02m/s stationarily when we changed the number of operation from 4 to 6. Maximum velocity of flow by change of an angle was from 0.42m/s to 0.47m/s. Therefore, we identified that these factors don't have a great influence on internal flow characteristics of a tank by investigating results with varying the number of operation and an angle.

• 한국고분자학회지:고분자과학과기술
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• 제7권3호
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• pp.266-270
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• 1996