검색결과

검색조건
좁혀보기
검색필터
결과 내 재검색

간행물

    분야

      발행연도

      -

        검색결과 30

        3.
        2017.04 구독 인증기관·개인회원 무료
        선창은 선박의 화물을 싣는 공간으로 구조적 문제로 인해 세정작업은 위험성이 크고 작업 난이도가 높은 작업이다. 이 연구에서는 전용 선창세정기의 설계 자료로 활용하기 위해 압력변화에 따른 분무특성을 고찰한 결과 노즐 형상의 최적화를 위한 변수 요소를 확인 하였다
        4.
        2016.10 구독 인증기관·개인회원 무료
        화물창의 내부 세정은 압축공기 또는 고압수를 이용하고 있으나 전용 세정기를 이용하지 않은 경우 위험성이 높은 작업이다. 이 연구에서는 화물창 고압세척기를 개발하기 위해 분사노즐의 유동특성을 수치해석 기법을 적용하여 고찰하였다. 그 결과 입자의 크기는 영향은 크지 않았으며 공급압력이 높을수 록 노즐부 끝단에서 유속과 분사거리는 지수함수로 증가하였다.
        6.
        2016.02 KCI 등재 구독 인증기관 무료, 개인회원 유료
        The flow acting on a confined jet flow can be represented as a conventional turbulence flow with its complex phase and characteristics. This is still effectively applied in a variety of industries, for example in ejectors. In this study coaxial confined model made of transparent acrylic pipe and driving water nozzle in order to figure out of recirculation flow near the wall of pipe and prove how flow in the pipe can be developed. It was revealed that length of the recirculation flow adjacent to wall of pipe was characterized to be larger when Reynolds Number is getting bigger.
        4,000원
        7.
        2015.11 구독 인증기관·개인회원 무료
        This study involved the shape of water jet nozzle to promote blasting ability and an increase of projection distance when cleaning VLBC cargo hold. Simulation of water jet projection process inside VLBC cargo hold was done in both 2D and 3D environment. The result are promising since both case show the capability of water contacting the desired target.
        8.
        2015.03 구독 인증기관 무료, 개인회원 유료
        In this study, the flow characteristics at the front and the rear side of the diffuser installed in the AHU for Offshore HVAC system were studied. Set up the rectangular prism of which height is H at diffuser inlet duct, the flow control methods were considered using PIV and CFD numerical analysis. Average flow velocity was increased by 37% and the degree of flow uniformity was 96.7% at x/H =1.5.
        3,000원
        9.
        2014.10 KCI 등재 구독 인증기관·개인회원 무료
        In this study, we have modeled a subsonic diffuser with rectangular prism and tried to investigate the influence of a turbulent wake flow by numerical simulation using computational fluid dynamics based on steady-state Navier-Stokes equation and standard k-ε model. A commercial CFD program, FLUENT, is used on the analysis. The turbulent wake is generated by a rectangular prism, which is installed at the diffuser. Flow Uniformity Showed the best results in the case of AR=1:1 and tended to be uniform in the critical point at Re=8.8×103
        11.
        2014.02 구독 인증기관·개인회원 무료
        It is intended to develop an experimental apparatus which can visualize flow patterns in condensate water reuse system with various cross sections. PVC particles on fluid surface help to obtain clear flow images. The flow region that were found in the experiments are steady, unsteady and significantly-mixed flows.
        12.
        2013.08 구독 인증기관·개인회원 무료
        LED는 전기에너지를 빛에너지로 전환하는 효율이 높기 때문에 차세대 광원으로 주목되고 있다. 그러나 조명성능을 향상시키기 위해서는 접합부에서 발생된 열을 적절히 방출하여야 하며, 밀폐형의 경우 방열판으로 전달되는 열을 외부로 배출하는 최적의 설계가 필요하다. 이 연구에서는 LED 조명의 캐비넷 냉각시스템에 설치되는 냉각팬의 위치를 수치해석의 방법으로 고찰한 결과 y/H=0.8 근방이 최적의 위치였다.
        13.
        2013.06 KCI 등재 구독 인증기관 무료, 개인회원 유료
        LEDs are increasingly used for many applications including automotive, display and special lighting applications. The performance and lighting characteristics of the LED depend on cooling condition because the power LED generates lots of heat. In this study, the effect of the generated heat from power LED module on cooling characteristics and performance is measured and evaluated. For experiments, the transient temperature of a power LED module with cooling condition is measured.
        4,000원
        15.
        2013.02 구독 인증기관·개인회원 무료
        This experimental study was investigated the flow characteristics around staggered cooling tube arrays. A particle image velocimetry technique was employed to obtain detailed measurements at inlet-velocity-based three Reynolds numbers and the frequency characteristics of the wake were analyzed by using spectral analysis of the measured wake velocity signals. As a results, the flow exhibits strong Reynolds number dependence in the developing region but no significant Reynolds number effects are observed in the spatially periodic region.
        16.
        2013.02 구독 인증기관·개인회원 무료
        LEDs are increasingly used for many applications including automotive, display and special lighting applications. The performance and lighting characteristics of the LED depend on cooling condition because the power LED generates lots of heat. In this study, the effect of the generated heat from power LED module on lighting characteristics and performance is measured and evaluated. For experiments, the transient temperature of a power LED module with cooling condition is measured.
        19.
        2012.04 KCI 등재 구독 인증기관 무료, 개인회원 유료
        In this study, a computational work to investigate the influence of a turbulent wake flow by a rectangular prism with different aspect ratio, which is installed at the inlet of a diffuser. The k-ω model was adopted to simulate the turbulence. The continuity and time averaged Navier-stokes equations were solved by a implicit finite volume scheme. The computational results are qualitatively well compared to existing experimental data by PIV. The results show that the velocity recovery of the subsonic diffuser is dependent on the aspect ratio of rectangular prism.
        4,000원
        1 2