• 유체기계공업학회:학술대회논문집
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• 유체기계공업학회 2006년 제4회 한국유체공학학술대회 논문집
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• pp.471-474
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• 2006

The Mixer is apparatus that help precipitation or an inhomogeneous distribution of various phases to be mixed and that user makes necessary material mixing one or the other. Mainly the mixer which is used from chemical and food industry is very important system in engineering that mixes the material. The inside flow of the mixer under the actual states which put a basis in flow of the fluid is formed rotation of the impeller. The inside flow of impeller will be caused by various reasons change with shape of impeller, number of rotation, mixing material and flow pattern of free surface etc. Also mixer study depended in single-phase flow and experimental research. So the numerical analysis of flow mixing solid-fluid particle is simulated. It is become known, that the case where agitator inside working fluid includes the solid particle the sinkage reverse which the solid particle has decreases an agitation efficiency. From the research which it sees the hazard solid which examines the effect where the change of the sinkage territory which it follows agitation number of revolution and diameter of the particle goes mad to an agitator inside flow distribution - numerical analysis the inside flow distribution of liquid state with Eulerian Two-Phase Method.

• 유체기계공업학회:학술대회논문집
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• 유체기계공업학회 2003년도 유체기계 연구개발 발표회 논문집
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• pp.101-106
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• 2003

In this work, mixing phenomena in the mixing chamber of a ultrasonic micromixer are analyzed through an analytical approach. A simplified 2-dimensional model for the ultrasonic micromixer is presented. Analytical solutions for fluid flow induced by ultrasonic waves are obtained through successive approximations method. From simulation results on thermal diffusion in the mixing chamber, effects of relative location, size, and vibration frequency of a piezoelectric material and aspect ratio of the mixing chamber on mixing performance of the ultrasonic micromixer are investigated. Finally, design guidelines for the ultrasonic micromixer are suggested based on the parametric study.

• 전기화학회지
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• 제26권1호
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• pp.1-10
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• 2023

리튬 이차전지의 4 대 구성요소에 포함되는 양극은 배터리의 에너지 밀도를 담당하는 중요한 구성요소에 속하며, 보편적으로 제작되는 양극의 습식 제작 공정에는 활물질, 도전재, 고분자 바인더의 혼합 과정이 필수적으로 이루어지게 된다. 하지만, 양극의 혼합 조건의 경우 체계적인 방법이 갖추어져 있지 않기 때문에 제조사에 따라 성능의 차이가 발생하는 경우가 대다수이다. 따라서, 양극의 슬러리 제작 단계에서 정돈되지 않은 혼합 방법의 최적화를 진행을 위해 보편적으로 사용되는 THINKY mixer와 homogenizer를 이용한 LiMn₂O₄ (LMO) 양극을 제조해 각각의 특성을 비교하였다. 각 혼합 조건은 2000 RPM, 7 min으로 동일하게 진행하였으며, 양극의 제조 동안 혼합 방법의 차이만을 판단하기 위해 다른 변수 조건들은 차단한 후, 실험을 진행하였다(혼합 시간, 재료 투입 순서 등). 제작된 THINKY mixer LMO (TLMO), homogenizer LMO (HLMO) 중 HLMO는 TLMO보다 더 고른 입자 분산 특성을 가지며, 그로 인한 더 높은 접착 강도를 나타낸다. 또한, 전기화학적 평가 결과, HLMO는 TLMO와 비교하여 개선된 성능과 안정적인 수명 주기를 보였다. 결과적으로 수명특성평가에서 초기 방전 용량 유지율은 HLMO가 69 사이클에서 TLMO와 비교하여 약 4.4 배 높은 88%의 유지율을 보였으며, 속도성능평가의 경우 10, 15, 20 C의 높은 전류밀도에서 HLMO가 더 우수한 용량 유지율과 1C에서의 용량 회복률 역시 우수한 특성을 나타냈다. 이는 활물질과 도전재 및 고분자 바인더가 포함된 슬러리 특성이 homogenizer를 사용할 때, 정전기적 특성이 강한 도전재가 뭉치지 않고 균일하게 분산되어 형성된 전기 전도성 네트워크를 생성할 수 있기 때문으로 간주된다. 이로 인해 활물질과 도전재의 표면 접촉이 증가하고, 전자를 보다 원활하게 전달하여 충전 및 방전 과정에서 나타나는 격자의 부피변화, 활물질과 도전재 사이의 접촉저항의 증가 등을 억제하는 것에 기인한다.

• 한국실내디자인학회논문집
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• 제19권4호
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• pp.58-65
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• 2010

The purpose of this study is to be applied with the basic data for the design method in the housing space which is differential. So, we analyzed the expression method and the application characteristic to materials of units in housing complex. To that, we researched on the condition of finishing material about the kind of material, color, texture and pattern for components in living room space. The results of this study are as follows : First, at the present time, the Object concept is expressed by 'mixing' and 'juxtaposition' of material, texture and pattern of finishing materials in housing space. But, we could find that the Object concept was used restrictively in housing space. So, we have to find different expression methods to be the effective and differential design by being applied Object concept for the housing space. Second, the 'mixing' which is the method to express the Object concept is showed in only 'art wall'. so, we can estimate that the method is the limited method to plan the varied housing. It is needed various expression methods to design components for the housing space. Third, it showed that the 'mixing' was a passive expression method using a little differential for design of housing space. We could estimate that similar methods were applied to the housing design. By results of this study, we can think that the develop study is needed to find design methods for expression of the Object in housing space.

• 한국지반환경공학회 논문집
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• 제23권5호
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• pp.15-24
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• 2022

준설 매립지반의 경우 공학적, 물리적 조건이 열악하여 매립현장에서 이를 개량하기 위한 시간과 비용이 많이 든다. 또한 국내 실정에 적합한 관중혼합 이송처리 공법의 적용사례가 없고 공법 적용성 및 효과에 관하여 불확실할 뿐 아니라 실제 현장과 실내실험 간의 차이가 발생할 수 있다. 이러한 문제점을 해결하기 위해 개질재(표준사+입도조절재)가 혼합된 준설토를 대상으로 실내 특성실험을 통해 개질재의 적정한 입도분포 및 함수비 범위를 결정하였다. 그 결과 단계투기 시 침강압밀계수가 증가하고 분리침강에 대한 개선효과가 있는 것으로 확인되었다. 실험결과 회귀분석을 통해 개질 처리토의 함수비에 따른 비배수전단강도를 도출하고, 이를 활용하여 배합비를 결정할 수 있는 상관식을 제시하였다.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2005년도 지반공학 공동 학술발표회
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• pp.581-590
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• 2005

The grouting method is widely used as the impermeable effect and ground reinforcement in construction. But, it has a problem that cement and grout material are not mixed well in the injection tip equipment and an opposite flow and interception state of the chemical grouting is happened. so, continuous work is difficult. McG method installed a special grouting and device, made possible go well mixing of grouting material and prevent flowing backward and block of nozzle also diversify powder rate of cement that is grouting material to select sutible material in layer conditions. YSS that lowered $Na_2O$ influencing durability and circumstance is developed by gel-forming reaction material. so eco-circumstance and durability is increased by minimizing dissolution of underground water. In this study, it is assumed that seepage state of the injection material using a special injection tip equipment and a unconfined compressive strenth by mixing a various injection material of various. And it is confirmed that strenth increase effect and permeable decrease of the improved body through the test execution and field execution.

• 대한기계학회논문집B
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• 제29권12호
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• pp.1307-1312
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• 2005

Turbulent in-situ mixing process is a new material process technology to get dispersed phase in nanometer size by controlling reaction of liquid/liquid, liquid/solid and liquid/gas, flow and solidification speed simultaneously. In this study mixing, the key technology to this synthesis method will be studied by computational fluid dynamics. For the simulation of mixing of liquid metal, static mixers will be investigated. Two inlets for different liquid metal meet and merge like 'Y' shape tube. The tube has various shapes such as straight and curved. Also, the radius of curve will be varied. The performance of mixer will be evaluated with quantitative analysis with coefficient of variance of mass fraction. Also, detailed plots of intersection will be presented to understand effect of mixer shape on mixing.

• 한국정보전자통신기술학회논문지
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• 제12권4호
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• pp.380-386
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• 2019

본 논문은 이송방식에 따른 혼합비율을 비교하기 위하여 동일 점도를 가지는 원재료를 사용하여 100 사이클 동안 주재료와 부재료의 투입량 오차를 측정하고 분석하였다. 측정 결과 피스톤 펌프 방식에서는 주재료와 부재료의 투입량 오차는 0g에서 3g까지 변화의 폭이 컸으며, 최대 오차비율은 10.3%로 큰 편차를 보였다. 듀얼-스크류 회전방식에서는 0.01g에서 0.4g으로 최대 오차 비율이 0.41%로 투입량 오차가 거의 발생하지 않았으며, 공정 사이클이 증가함에도 거의 균등하게 투입됨을 알 수 있었다. 듀얼-스크류 회전방식 이액형 혼합시스템을 이용하여 원재료의 점도가 다른 3종류의 액상 실리콘을 사용하여 100 사이클 동안의 주재료와 부재료의 투입량을 측정하고 분석하였다. 그 결과 적용한 원재료의 점도에 관계없이 평균 오차가 0.75g, 오차 비율은 1% 미만으로 측정되었으며, 동일 점도를 갖는 원재료를 사용했을 때 피스톤 펌프 방식의 평균 오차 비율은 4.09 %로 측정되었다. 이 결과는 듀얼-스크류 회전방식을 적용한 실험에서 일정한 혼합비율로 주재료와 부재료가 투입됨을 알 수 있었다.

• Structural Engineering and Mechanics
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• 제88권3호
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• pp.239-249
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• 2023

The Radial Point Interpolation Method (RPIM) has been proposed to overcome the difficulties associated with the use of the Radial Basis Functions (RBFs). The RPIM has the following properties: Simple implementation in terms of boundary conditions as in the Finite Element Method (FEM). A less expensive CPU time compared to other collocation meshless methods such as the Moving Least Square (MLS) collocation method. In this work, we propose an adaptive high-order numerical algorithm based on RPIM to simulate the thermoviscoplastic behavior of a material mixing observed in the Friction Stir Welding (FSW) process. The proposed adaptive meshfree RPIM algorithm adapts well to the geometric and physical data by choosing a good shape parameter with a good precision. Our numerical approach combines the RPIM and the Asymptotic Numerical Method (ANM). A numerical procedure is also proposed in this work to automatically determine an improved shape parameter for the RBFs. The efficiency of the proposed algorithm is analyzed in comparison with an iterative algorithm.

• Tribology and Lubricants
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• 제31권3호
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• pp.102-108
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• 2015

In this research, we experimentally investigated the sealing performance of elastomeric rotary lip seals for washing machines. In general, NBR is used as a material for elastomeric rotary lip seals in washing machines, but the mixing formula of the rubber material can affect the sealing performance. In this study, we manufactured rotary lip seals using three kinds of NBRs with a different mixing formula, and examined the sealing performance using an acceleration test mode. The results of an SEM investigation into the surfaces of three kinds of specimens showed a much smaller wear volume and better sealing performance for the specimens with smaller particle sizes of mixing composition than for the specimen with the larger. Repeated deformation and recovery by the shaft-to-seal eccentricity on rotation were shown to cause a phase difference in the rubber material, and we measured the recovery ratio to find the influence of this phase difference on the sealing performance. As another method for checking the phase difference, we also measured tan ä, and a lower tan ä was revealed as the recovery ratio increased for each specimen. Specimens with a higher recovery ratio (lower tan ä) were shown to have a better sealing performance. Consequently, specimens with a smaller particle size in the mixing composition had a better sealing performance because they show a higher recovery ratio.