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THPC-urea/암모니아 큐어링에 의한 면직물의 방염가공
현재민,이장훈,장병율,김혜정,안승국,Hyun, Jae Min,Lee, Jang Hun,Chang, Byoung Ryul,Kim, Hey Jung,An, Seung Kook 한국섬유공학회 2016 한국섬유공학회지 Vol.53 No.6
Cotton fabrics were treated with tetrakis(hydroxymethyl)phosphonium chloride-urea precondensate via pad-dry-ammonia curing to reduce the flammability of the fabrics. Optimum finishing conditions were investigated for durable flame retardancy including the physical properties such as tensile strength and color fastness to washing. The fabrics treated by this technique showed excellent durable flame resistance, higher tensile strength, and a slightly lower tearing strength in comparison with the untreated fabric.
현재민(Jae Min Hyun) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
이 강연에서는 자연대류 연구의 기본 모형인 측벽가열형 공동에서 발생하는 비정상 유동과 열전달과 관련하여 지난 30년간 이루어진 연구성과를 살펴보기로 한다. 먼저 계단형 열적 조건 변화에 응답하는 자연대류 과도 거동을 통해 밀폐공간 내부에서 형성되는 열유동장의 시공간적 특성을 정리할 것이다. 다음으로 주기적으로 변하는 외부조건 반응하는 자연대류 현상을 다루면서 유동의 동특성과 외부 조건의 주기성 간의 상호작용을 규명한 이론적 성과와 공학적 응용 가능성을 토의할 것이다. 이러한 논의를 통해 자연대류의 비정상 특성에 대한 체계적인 이해를 바탕으로 열전달 증진 또는 억제를 도모할 수 있음을 확인하고 에너지가 화두가 되고 있는 지금 기존 연구의 이론적 성과를 실제적인 용용으로 구체화할 후속 작업이 필요함을 제기할 것이다.
공랭식 열교환핀이 부착된 열전모듈의 냉각 성능에 관한 연구
신재훈(Jae-Hoon Shin),한훈식(Hun Sik Han),김윤호(Yun Ho Kim),김서영(Seo Young Kim),현재민(Jae Min Hyun) 대한설비공학회 2010 설비공학 논문집 Vol.22 No.3
Thermal performance of louver fin and plate fin in a thermoelectric cooling system with a duct-flow type fan arrangement is analytically evaluated. The thermoelectric cooling system consists of a thermoelectric module and two heat exchanger fins. The analytic results show that the optimized louver fin has lower thermal resistance than plate fin. The COP and heat absorbed rate of the thermoelectric cooling system with optimized louver fins are 10.3% and 5.8% higher than optimized plate fins, respectively.
측벽온도차를 갖는 사각용기에서의 비정상 자연대류의 유동구조
박준상(Jun Sang Park),현재민(Jae Min Hyun) 한국유체기계학회 2006 유체기계 연구개발 발표회 논문집 Vol.- No.-
A theoretical analysis is conducted for transient flows of a stratified fluid in a differentially-heated square cavity. The adjustment process of the global flow over the heatup timescale O ( R <SUP>1/4</SUP>a N ?¹ ) is described by utilizing the matched asymptotic method. The dynamics of boundary layers at the horizontal walls is depicted. Furthermore, the mechanism of mass transport near the horizontal walls is analyzed. Based on the analogy between rotating and stratified flows, the horizontal boundary layer is shown to possess a double-layered structure, which consists of the inner R <SUP>- 1/6</SUP>a -layer and the outer R <SUP>- 1/8</SUP>a -layer.
시간주기적 자기장에 의한 입방체 내부의 자연대류 열전달 증진
강동구(Dong Gu Kang),현재민(Jae Min Hyun) 대한기계학회 2017 대한기계학회 춘추학술대회 Vol.2017 No.11
A numerical study was made of natural convection of air (paramagnetic fluid) in a cubic enclosure under constant gravity and time-periodic magnetic field. In the cube, the two opposite vertical sidewalls are maintained at different temperatures and the other walls are thermally insulated. In this basic layout, the magnetic field is applied externally by placing two sets of electrical coil; left and right sides of the cube. The currents in the coils are activated in an alternating fashion. The computed results revealed the existence of resonance, and the resonance frequency is characterized by the basic mode of internal gravity oscillations. The amplification characteristics of the amplitude of heat transfer in the interior are linearly dependent on the magnitude of magnetizing force.
자기장하에서 부분적 경계조건을 가진 밀폐용기의 자연대류 현상
최동원(Dong-Won Choi),현재민(Jae-Min Hyun) 한국마린엔지니어링학회 2009 한국마린엔지니어링학회 학술대회 논문집 Vol.2009 No.-
The natural convection in a rectangular cavity with partially active walls under magnetizing force is investigated numerically. The active part of the right side wall is at higher temperature than that of the left side wall. The governing equations are discretized by using control volume method with QUICK-scheme and solved numerically by SIMPLER algorithm. The results are obtained for Prandtl number 0.7 under magnetizing force.
곽호상(Ho Sang Kwak),현재민(Jae Min Hyun) 한국전산유체공학회 1997 한국전산유체공학회 학술대회논문집 Vol.1997 No.-
Unsteady natural convection of an enclosed fluid has been one of the fundamental thermo-fluid problems, of which dynamic relevance is found in many engineering applications. Together with the inherent coupling between the boundary layers and the interior core, and strong interaction between flow and temperature fields, the unsteadiness poses serious hurdles for analytical and experimental approaches. With the recent development of computers and solution algorithms, computational fluid dynamics has become the prevailing tool to tackle the underlying problems. In this presentation, a few examples of numerical studies are introduced. The usefulness and potential of numerical simulations in investigating unsteady natural convection are elaborated.
박준상(Jun Sang Park),현재민(Jae Min Hyun) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
A unified theory is made of spin-up flows in an incompressible homogeneous fluid, in which the system Ekman number is assumed to be very small enough to ensure the boundary layer flows neat the container walls and Taylor-Proudman column flow in the inviscid interior region. By way of finding out proper physically acceptable time scaling, spin-up theories about linear (ε→0) and nonlinear cases (ε→1.0), which have already well-established, respectively, in some different each ways but those are still being an incomplete theory because they do not converge to each other in the limit cases, have successfully unified on a unique theoretical fundamentals.
회전방향 온도변화를 갖는 매우 빠르게 회전하는 파이츠 내의 기체유동
박준상(Jun Sang Park),현재민(Jae Min Hyun) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11
An analysis on the steady-state has been made of flow of a compressible fluid rapidly-rotating in a<br/> pipe. The flow is induced by an small arbitrary azimuthally-varying thermal forcing added on the basic<br/> state of rigid body isothermal rotation. The system Ekman number is assumed to be very small value.<br/> Analytic solutions have been obtained for axisymmetric and non-axisymmetric types, in which the<br/> axisymmetric solution comes from the azimuthally-averaged wall boundary condition and the<br/> non-axisymmetric solution from fluctuating wall boundary condition.