• Journal of the Korea Convergence Society
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• v.12 no.2
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• pp.215-219
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• 2021

The flow analyses around the wing of airplane installed with winglet or sharkelt were carried out in this study. At the model without winglet, it can be seen that the air flows beside the wing and the flow is concentrated at the end of wing. At the model of winglet or sharklet, the pressure on the bottom of the wing happens to be lower in the wide area than for model without winglet. At the analysis result, the air flowing next to the wing can be seen to go over and rotates over the main wing. The model with the sharklet shows that the flow rate is the fastest. In case of model with sharklet, it is thought that the maximum total pressure of flow is distributed at the bottom of the wing, which can further improve the lift force of the wing. It is thought that the analysis results in this study on the air flow due to the configuration of aircraft edge wing can be helped at its convergent research.

• Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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• 2004.04a
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• pp.19-22
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• 2004

Two-dimensional modeling studies using TOUGHREACT were conducted to investigate the coupling between flow and transport developed as a consequence of differences in density, dissolution/ precipitation, and medium heterogeneity. The model includes equilibrium reactions for aqueous species, kinetic reactions between tile solid phases and aqueous constituents, and full coupling of porosity and permeability changes resulting from precipitation and dissolution reactions in porous media. Generally, the evolutions in the concentrations of the aqueous phase are intimately related to the reaction-front dynamics. Plugging of the medium contributed to significant transients in patterns of flow and mass transport.

• Journal of the Korean Solar Energy Society
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• v.24 no.1
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• pp.29-38
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• 2004

자동자 공조용 시스템에 사용되는 평행류형 응축기에 대하여 실제 운전조건에서 성능을 예측할 수 있는 모델링을 개발하였다. 모델링에 사용된 방법은 유효도-전달단위수법이고, 국소구간을 나누어 해석하는 국소구간법을 사용하였다. 모델링에 사용된 작동유체는 HFC134a이며, 응축기를 흐르면서 방생하는 냉매의 압력손실에 대한 물성변화를 포함시켜 보다 실제에 가깝게 해석하였다. 모델링에는 공기측과 냉매측의 열전달계수와 압력손실계수에 관한 상관식들을 포함하고 있다. 모델링의 결과는 실험값과 비교하여 비교적 잘 일치한다.

• 한국가시화정보학회:학술대회논문집
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• 2005.12a
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• pp.89-92
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• 2005

A microcapsule for drug delivery was successfully produced by utilizing the flow-through droplet-based supramolecular self-assembly in a crossed microchannel network. The PS-b-PMMA block copolymer synthesized atom transfer radical polymerization (ATRP) was initially formed as microdroplets and after the evaporation process it turned to spherical capsule by polymer self-assembly of the micro domains. The characteristics were studied using various analysis methods.

• Transactions of Materials Processing
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• v.7 no.4
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• pp.364-374
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• 1998

It is the objective of this study to analyze the effect of various process variables on the quality of extruded product and extrusion force for semi-solid extrusion of Al2024 with solid phase structure of globular type by the finite element method. Process variables are initial solid fraction, ram speed, semi-angle of die, and reduction in area. The results of experiment are compared with those of simulation in order to verify the usefulness of the developed finite element program. The flow and deformation of semi-solid alloy are analyzed by coupling by coupling the deformation of porous skeleton and the flow of liquid phase. It is also assumed that initial solid fraction is homogeneous.

• Honam Mathematical Journal
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• v.30 no.1
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• pp.75-89
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• 2008

Interrupted blood flow diminishes the concentration of oxygen in tissues. Hypoxia first appears in the region distal to the capillaries and grows throughout the entire t issue. However, the time-wise evolution of hypoxic area is diverse when some of capillaries are blocked in a multi-capillary domain with different oxygen squirt. The process of the development of hypoxia through time course is analyzed mathematically in the domain. Each source in steady state is controlled by a time sensitive function to simulate the occlusion.

• The KSFM Journal of Fluid Machinery
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• v.13 no.3
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• pp.24-29
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• 2010

Axial fans for an air-conditioning unit are designed to equip the system with an expected flow-rate and low noise level by applying the blade design method of multi-sectioning and local camber generation. In this study, the distributions of chord length, stagger angle, and camber angle are globally and locally determined for the given specific speed, which is considered to be relatively high. The mock-up fans are observed to satisfy the aerodynamic performance and the noise level for the system simultaneously and discussed in terms of local flow patterns related to the emitted noise.

• Proceedings of the KSME Conference
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• 2003.04a
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• pp.1789-1794
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• 2003

Transient and asymmetric density distributions have been investigated by digital speckle tomography. Multiple CCD images captured movements of speckles in three angles of view simultaneously because the flows were asymmetric and transient. The speckle movements between no flow and downward butane flow from a circular half opening have been calculated by a cross-correlation tracking method so that those distances can be tranferred to deflection angles of laser rays for density gradients. The three-dimensional density fields have been reconstructed from the fringe shift by a real-time multiplicative algebraic reconstruction technique (MART).

• Journal of Advanced Marine Engineering and Technology
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• v.36 no.1
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• pp.109-117
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• 2012

This paper addresses influence on the flow field by varying the length of DPF Inlet pipe in 5 ways. Numerical analysis is carried out by using PIV and commercial code and as a result, PIV and commercial code shows correlation correspond to 87%. Furthermore, in the same velocity condition, as stable and high pressure value is shown when the Inlet pipe length is 20mm, particulate filtering rate can be increased.

• Transactions of the Korean Society of Machine Tool Engineers
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• v.17 no.3
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• pp.94-100
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• 2008

New type of the sewer drainage has been developed to overcome present sewer drainage's shortcoming. This system has the function of drainage, sewerage, reverse flow prevention, and harmful insect and smell prevention. Numerical simulation has been carried out in order to minimize the troubles that can be happened in the process of manufacture and installation process. This sewer drainage system for harmful insect and smell prevention intercepts pollution source, and then it prohibit second pollution. Harmful insect cannot go in and out in this system. Also, this system can reduce the damage of flooded districts due to heavy rain because it is impossible to flow backward from sewer drainage.