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- 저자 : 권세진 (검색결과 713 건)
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등방 난류 유동장내 난류 예혼합 화염 전파의 통계적 시뮬레이션
권세진 울산대학교 1994 공학연구논문집 Vol.25 No.2
등방 난류 유동장내를 전파하는 난류 예혼합 화염에 관한 이론적인 연구를 수행하였다. 통계적 시간 급수 방법을 사용하여 화염 표면을 따라 미연 가스 영역의 난류 유동장을 모사 (simulate) 하고 2차원 화염면 운동 알고리즘을 사용하여 화염 전파에 따르는 화염면의 성질을 수치적으로 모사하였다. 본 연구의 목적은 난류 예혼합 화염의 기하학적 구조와 전파 속도를 효율적으로 예측할 수 있는 계산법을 개발하고 검증 하는데 있다. 계산 결과는 다양한 난류 강도와 레이놀즈수를 갖는 수소-공기 혼합 가스에 대하여 측정된 기존의 실험 결과와 비교하였다. 본 연구에서 제안된 2차원 계산은 화염 반경 성장율, 화염 반경 변형율, 프랙탈 차수등에서 측정치와 유사한 경향을 보였으며, 이 방법이 보다 복잡한 형태의 난류 화염 전파에 효율적으로 적용될 수 있음을 확인하였다. A theretical investigation of turbulent premixed flames propagating in isotropic turbulence is presented. Flame surface properties were numerically simulated using a two-dimensional flame propagation algorithm combined with statistical time series simulation of unburned gas velocities along the flame surface. The objective is to develop and test an efficient technique to predict the propagation speed of flame as well as the geometric structure of the flame surfaces. Predictions were compared with existing experimental data for flames propagating in a closed vessel charged with hydrogen/air mixture with various turbulence intensities and Reynolds numbers. Two dimensional time dependent simulation resulted in correct trends of the measured flame data. Comparisons were made in flame radius growth rate, rms flame radius fluctuations, and average perimeter and fractal dimensions of the flame boundaries. The reasonable behavior and high efficiency proves the usefulness of this method in complex problems of flame propagation.
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2P-237 High barrier propertis of Poly(vinylalcohol)-based nanocomposites films using boric acid
권세진,강호용,임종태,석웅철,강주희,송호준,이상국 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.1
The food industry is a large consumer of packaging materials with a variety of requirements to assure the safety and quality of packaged food. The purpose of packaging is to protect the product from the environment, such as the effects of gases, water(vapor), odors, microorganisms, dust and etc. Among these effects, the water(vapor) and the oxygen gas is the most important factor. Recently, the montmorillonite(MMT) based barrier films can be used for barrier film research. The MMT was widely used because it was improved the barrier property. However, even if MMT was used for the barrier film, it was not easy to overcome the limit of the wet film coating. In this work, we have tried to improve of water and oxygen barrier properties by using boric acid.
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Characterization of the adhesive for low-temperature curing property using the synthesized polymers
권세진,김우진,임종태,석웅철,강주희,송호준,이상국 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
Light emitting diodes (LEDs) have increasingly been studied for application in the field of displays and lighting to fabricate environmentally friendly illumination devices with low energy consumption. The LED adhesive is essential to stick the light diffusion lens on the substrate for smooth and bright light of the LED. In order to increase the productivity of the LED lens, it is required to the LED lens adhesives rapidly cured at a low temperature. The LED lens adhesives are composed of epoxy resins, hardener and catalyst. At low temperatures, the curing reaction of epoxy and mercaptan is faster than the reaction of epoxy and amine. In this study, we are studied the adhesive behaviors of diglycidyl ether of bisphenol A (DGEBA) and synthesized thiol-polymer by different methods. We adopted the thiol-polymer with different method in order to enable low-temperature and fast curing.
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2P-238 The property of Poly(vinyl alcohol)-based nanocomposites films using Clay of various sizes
권세진,강호용,임종태,석웅철,강주희,송호준,이상국 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.1
As gas barrier films achieved a long protective period for packaged products, it was utilized in various fields such as pharmaceuticals, flexible electronics and food packaging industries. In the packaging industries, the main purpose is to protect the food from microbial and chemical contamination, oxygen, water vapour and light for a long time. The reduction of oxygen, moisture sorption, and diffusion can suppress internal damage and improve long-term performance. Therefore, barrier films must prevent or at least decrease the gas/moisture transfer between the product and the surrounding atmosphere. In this work, we have tried to improve of barrier property by using clay of various sizes in PVA polymer matrix. The composites films were prepared to reduce the oxygen affinity by interactions and arrangement, dispersion of intramolecular structure between PVA matrix and clay of various sizes.
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권세진,김석조,임종태,석웅철,강주희,송호준,이상국 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.1
In recent years, there is an increased demand in the polymer industry for producing packaging films that are more barrier and stronger than those already on the market. Recent researches on the properties of a novel class of composite materials known as polymer/clay nanocomposites (PCNs) indicate that they could be employed for this purpose. Properties such as super mechanical strength, high modulus, reduction in weight, as well as improved barrier properties against liquids, gases and vapors are achievable with this novel composite. In this work, we have tried to improve of barrier property by using oligomer of different structure (linear and branch). The polymer coating layer was prepared to reduce the oxygen affinity and the water affinity by interactions between PVA matrix and oligomer.
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