• Korean Chemical Engineering Research
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• v.48 no.5
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• pp.545-555
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• 2010

Recently, droplet-based microfluidic systems are widely used in various areas ranging from fundamental science including chemistry, biology, and physics to material science and engineering. This article reviews recent development in the droplet based microfluidic system from basic fabrication of tiny device, principle of droplet formation, merging, mixing, control of droplets, and application for the synthesis of novel functional materials. We discuss strong advantages of the droplet based microfluidics in point of control of particle size, morphologies, shapes, and structures.

• The Journal of the Korea Contents Association
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• v.13 no.6
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• pp.48-54
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• 2013

In these days, the state-of-art technologies employ the heterogeneous parallelization of CPU and GPU for fluid simulations in the field of computer graphics. In this paper, we present a novel CPU-GPU parallel algorithm that solves projection step of fluid simulation more efficiently than existing sequential CPU-GPU processing. Fluid simulation that requires high computational resources can be carried out efficiently by the proposed method.

• Journal of Advanced Marine Engineering and Technology
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• v.38 no.4
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• pp.502-507
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• 2014

In this paper, performance characteristics of cycles were studied when mixed working fluid was used for ocean thermal energy conversion (OTEC). Among the various mixed refrigerants for industrial heat-pump, R32/R152a used in ocean thermal energy conversion system. For simulations, R32/R152a were used in existing closed cycle and Kalina cycle which is used only ammonia and water as mixed refrigerant. Temperature of the warm heat source was 26 and 29 celsius degree, temperature of the cold heat source was 5 celsius degree. In results of simulation, Gross power of the closed cycle on R32 was 22kW, and efficiency of the cycle was 2.02%. When the mixed refrigerant of R32/R152a, in the ratio of 90 to 10, gross power of the closed cycle was 29.93kW, and efficiency of the cycle was 2.78%. Gross power and cycle efficiency of R32/R152a increased by 36% and 37% than those of existing single refrigerant. Additionally, the same simulations were conducted in Kalina cycle with the same various composition ratio of mixed refrigerant.

• Journal of the Korea Institute of Military Science and Technology
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• v.2 no.2
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• pp.279-286
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• 1999

Wall-bounded 유동과 달리 자유 전단 유동은 Hyperbolic Tangent Profile을 가지고 비점성 불안정에 의해 지배된다. 따라서 자유 전단 유동에서 난류로의 천이과정은 비점성 불안정성 이론에 의해 해석되어 진다. 본 연구는 분리판(Splitter plate)에 의해 분리된 속도가 다른 자유 유속의 혼합에 의해 형성되는 혼합층에서 와류병합과정에 대한 속도비의 영향에 대하여 연구한다. 속도비는, R, $ \frac{U_1-U_2}{U_1+U_2}$ 로 정의되며, 여기서 $U_1$은 분리판 위에서의 자유 유속을 그리고 $U_2$ 는 분리판 아래에서의 자유 유속을 나타낸다. 본 연구에서 와류구조의 병합작용을 분석하기 위하여 2차원 비정상 Large-Eddy Simulation 방법을 적용하였다. 속도비의 변화에 따라 혼합층에서 불안정 Wave가 성장하게 되고, 유체는 2차원 와류구조에서 Roll-up한다. 이러한 2차원 와류구조는 주위의 다른 와류구조와 상호작용을 하게 되고 하나의 커다란 와류구조를 형성하는 것을 볼 수 있다. 혼합층에서 와류병합과정은 반복적으로 일어나는 것을 알 수 있었고, 이 결과를 이용하여 혼합층의 성장을 제어할 수 있다.

• Proceedings of the Korean Vacuum Society Conference
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• 2010.02a
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• pp.440-440
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• 2010

$SF_6$ 기체 및 Ar/$SF_6$ 혼합 기체 방전은 실제 반도체 및 디스플레이 공정에서 널리 쓰이고 있지만, 측정상의 어려움으로 인하여 정량적인 데이터 및 기본 연구가 부족한 실정이다. 본 연구는 유도 결합 Ar/$SF_6$ 혼합 기체 플라즈마에서 다양한 압력과 혼합 가스 비율에 따른 전자 에너지 분포 측정을 통한 플라즈마 변수 연구에 관한 내용이다. 낮은 가스 압력에서 $SF_6$ 기체의 혼합 비율이 증가함에 따라서 상대적으로 적은 전자 밀도 감소와 전자 온도의 증가가 보였다. 하지만, 높은 가스 압력에서 $SF_6$ 기체의 혼합 비율이 증가함에 따라 상당한 전자 밀도 감소와 급격한 전자 온도 증가 (~ 9 eV)가 관찰되었다. 이러한 전자 온도와 전자 밀도의 극적인 변화는 $SF_6$ 기체 증가에 의한 전자-중성종 충돌과 음이온 생성으로 인한 것으로 여겨지며, 유체 모델 및 전자 가열 모드를 고려하여 해석하였다.

• The KSFM Journal of Fluid Machinery
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• v.11 no.5
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• pp.50-56
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• 2008

Metal cutting operations involve generation of heat due to friction between the tool and the pieces. This heat needs to be carried away otherwise it creates white spots. To reduce this abnormal heat cutting fluid is used. Cutting fluid also has an important role in the lubrication of the cutting edges of machine tools and the pieces they are shaping, and in sluicing away the resulting swarf. As a cutting fluid, water is a great conductor of heat but is not stable at high temperatures, so to improve stability an emulsion type mixed fluid with water and oil is often used. It is pumped over the cutting site of cutting machines as a state of atomized water droplet coated with oil by using jet. In this paper, to develop cutting fluid supplying nozzle to obtain ultra thin oil film for coating water droplet, a numerical analysis of three dimensional mixed fluid Jet through multi-stage nozzle was carried out by using a finite volume method. Jet flow characteristics such as nozzle exit velocity, development of mixing region, re-entrance and jet intensity were analyzed. Detailed mixing process of fluids such as air, water and oil in the nozzle were also investigated. It is easy to understand complex flow pattern in multi-stage nozzle. Important flow Information for advance design of cutting fluid supplying nozzle was drawn.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.13 no.1
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• pp.105-114
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• 1993

The ciculation due to bottom density current produced by a dense inflow into a small reservoir is analysed by numerical scheme. Before the front of the density current arrives at the downstream end, the mixing in the reservoir is mainly caused by the anticlockwise vortex formed at the downstream of plunging point along the movement of bottom density current. Upon the arrival of the front of the density current at the downstream end an internal surge is created through an internal hydraulic jump. With repeated propagation of the internal surge back and forth the mixing in the reservoir is progressed and the thickness of dense layer is increased upward. The dilution of the overflow at downstream end is found to depend on inflow densimetric Froude number, reservoir length and elapsed time. The time required for the overflow to attain a specified dilution increases as reservoir length increases and Fre decreases.

• Journal of Advanced Marine Engineering and Technology
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• v.21 no.1
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• pp.43-48
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• 1997

The present study is aimed to investigate experimentally on the hydrodynamic behaviours of air ~ pulverized coal flow in rectangular combustor with cavity. Mean velocity, density and tur¬bulent properties of pulverized coal in rectangular entrained flow combustor were measured by PDA. Experimental results show that the flow reattachment point at the lower plane in the com¬buster chamber has been developed near X/D= 15. The similarities at each section are found after the flow reattachment point. The maximum values of turbulent intensity and Reynolds shear stress have been shown near Y/D=6, which is higher than centerline. The maximum density of the pulverized coal sited in the range ofY/D=6~8.

• The Journal of the Acoustical Society of Korea
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• v.8 no.1
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• pp.23-30
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• 1989

Propagation phenomena of nonlinear pressure waves in a bubbly mixture are studied. The governing equations for a bubbly mixture are derived heuristically and energy equation is incorporated with other governing equations to take thermal effects into consideration inside the bubble. This non-isothermal condition of the bubble inside is especially important when high amplitude pressure waves are treated. Keller's equation is adapted for the bubble dynamics as practical problem. Some numerical simulations are carried out for the shock tube problem using a computer program based on the above model. A comparison with experimental results of Noordzij and van Wijngaarden shows that the structure of the wave in the shock tube experiment seems to be much more significantly affected 요 the complex heat transfer phenomena inside the bubbles than by the relative translational motion between bubbles and surrounding liquid.

• Journal of computational fluids engineering
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• v.12 no.2
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• pp.37-45
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• 2007

The hybrid Cartesian/immersed boundary method is applied to simulate fluid-structure interaction of a two-dimensional orbiting flexible foil. The elastic deformation of the flexible foil is modelled based on the dynamic equation of a thin-plate. At each time step, the locations and velocities of the Lagrangian control points on the flexible foil are used to reconstruct the boundary conditions for the flow solver based on the hybrid staggered/non-staggered grid. To test the developed code, the flow fields around a flapping elliptical wing are calculated. The time history of the vertical force component and the evolution of the vorticity fields are compared with recent other computations and good agreement is achieved. For the orbiting flexible foil, the vorticity fields are compared with those of the case without the deformation. The combined effects of the angle of attack and the orbit on the deformation are investigated. The grid independency study is carried out for the computed time history of the deformation at the tip.