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180˚ 곡관덕트에 연결된 직관덕트에서 층류정상 유동의 PIV계측에 의한 유동해석
박길문(Gil-moon Park),이행남(Haeng-nam Lee),손현철(Hyun-chull Sohn),이종구(Jong-gu Lee),이홍구(Hong-gu Lee),이덕구(Duct-gu Lee),윤완중(Wan-jung Yun) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
The velocity vectors and kinetic energy of laminar steady flows in the exit region connected to the square-sectional 1800 curved duct investigated experimental by PIV measurements.<br/> The experimental study for air flows was conducted to measure velocity vectors and kinetic energy distributions by using the Particle Image Velocimetry (PIV) system with the data acquisition of cactus'2000 software.<br/> The results obtained from experimental studies arc summarized as follows :<br/> (1) The Velocity vector distributions in the entrance region was influenced by centrifugal force of the curved duct as the flow develops to downstream in the exit duct<br/> (2) The maximum kinetic energy of laminar steady flow was gradually increased as the Reynolds number (Re) increased.<br/> (3) The entrance length is correlated as ??=0.026 in developing laminar steady flows. The entrance length is a function of hydraulic diameter (D_h)and Reynolds number(Re).
이행남,박길문,이덕구,설재림,Lee Heang-Nam,Park Gil-Moon,Lee Duck-Gu,Sul Jae-Lim 한국마린엔지니어링학회 2005 한국마린엔지니어링학회지 Vol.29 No.5
The ejector is used to obtain a vacuum state, and it has been applied to a lot of industry field such as a heat engine, a fluid instrument power plant. a food industry, an environment industry etc., because there is no problem even it is mixed with any kind of liquid, gas. and solid. The flow characteristics in the ejector was investigated by a PIV and a CFD. The agreement between numerical analysis and experiment shows the validity of this study and the results of this study would be useful to the engineers who design for the flow systems for heating. ventilation. air conditioning and wastewater purification plants.
흡.배기 팬에 의한 Desktop Personal Computer 내부의 유동특성에 관한 연구
이행남,박길문,정한별,Lee, Haeng-Nam,Park, Gil-Moon,Jung, Han-Byul 한국마린엔지니어링학회 2007 한국마린엔지니어링학회지 Vol.31 No.6
The purpose of this study is to find out a flow characteristics required by the design of a computer case and to provide information about the preliminary data of cooling efficiency of CPU and a flow inside of a case. We examined a flow characteristic-suction a tracing particle occurred from a surge tand installed at an inlet into a computer case and moving it to a exit duct-experimentally by using PIV. The experimental device was consists of a fan inflowing and discharging the air into the computer case and a slot installed with a CPU cooling ran add-on, and analyzed the data of Re-stress distribution, velocity distribution, and kinetic energy distribution. This research will make a great contribution to improvement of the efficiency and performance of notebook, workstation, server, and all the design of electronic devices using large scale integrated(LSI) as well as usual computers.
장방형 용기내 자성유체의 Benard유동에 대한 전열 제어 특성에 관한 연구
안종국,서이수,박길문,Ahn, Jong-kug,Seo, Lee-Soo,Park, Gil-Moon 한국유체기계학회 2004 한국유체기계학회 논문집 Vol.20 No.2
This study deals with the Benard Flow of Magnetic Fluids in a rectangular cavity which the ratio between height and width is 1 : 4 and the base side or left side is a heating face while other sides are to be cooling faces. When Magnetic field was equally impressed, considering the internal rotation of the elementary ferromagnetic particle, we found the following result from the numerical analysis of the GSMAC algorithm applied to the equation of the magnetic fluid. Benard flow is controlled by intensity and direction of magnetic fields, and critical point appears when especially magnetic field with a heating base and side area near H=-7000 and H=-10000 is applied.
광역상수도용 펌프의 최적결정을 위한 펌프/모터 선정 프로그램 개발
노형운,김재수,박길문,서상호,이영호,Roh, Hyung-Woon,Kim, Jae-Soo,Park, Gil-Moon,Suh, Sang-Ho,Lee, Young-Ho 한국유체기계학회 2001 한국유체기계학회 논문집 Vol.4 No.4
The pump/motor selection program for optimized selection of regional water supply facilities was developed based on a flowchart compiled from basic operational data, total head requirement, initial pump/motor specification selection etc. This program was developed in Visual Basic. The program accepts, as in the flowchart, operational requirements of pumps and other system requirements, and calculates specific speed based on flow rate, total head and rotational speed. Then the calculated specific speed is used to select pump types and speed prior to determining likelihood of cavitation occurring at the calculated NPSH. Power requirement is then calculated for safe operation of pump to assist final pump selection. Test results of the program match very closely to the design values of Paldang intake pump station(3rd stage) proving that the program can be used as an effective and practical aid for designing new regional water supply systems.
PIV와 CFD에 의한 Ejector내의 유동특성 연구
박지만(Ji-Man Park),이행남(Haeng-Nam Lee),박길문(Gil-Moon Park),이덕구(Duk-Gu Lee),설재림(Jae-Lim Sul) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11
The Ejector is used to get low pressure, and it has been applied to a lot of industry field like the<br/> heat engine, the fluid instrument power plant, the food industry, environment industry etc... because<br/> there are not any problem even it is mixed with a any kind of liquid, gas, and solid. The flow<br/> characteristics in ejector are investigated by PIV and CFD. The experiment using PIV measurement for<br/> mixing pipe's flow characteristics acquired velocity distribution, kinetic energy distribution, and<br/> whirlpool . (Condition : when mixing pipe's diameter ratio is 1:1.9, and the flux is ??Based on the PIV and the CFD results, the flow<br/> characteristics in ejector are discussed, and it shows the validity of this study.
자성유체의 밀폐공간내의 열전달 특성에 관한 실험적 연구
박정우(Joung-Woo Park),서이수(Lee-Soo Seo),전철호(Chel-Ho Chen),박길문(Gil-Moon Park) 한국자기학회 2003 韓國磁氣學會誌 Vol.13 No.3
Natural convection of a magnetic fluid is different from that of Newtonian fluids because magnetic-body force exists in addition to gravity and buoyancy. In this paper, natural convection of a magnetic fluids (W-40) in a cubic cavity was examined by experimental method. One side wall was kept at a constant temperature (25℃), and the opposite side wall was also held at a constant but lower temperature (20℃). The magnetic fields of various magnitude were applied up and down by permanent magnets. We measured temperatures at 5 points which are the most suitable places in cavity by the analysis record. The thermo-sensitive liquid crystal film (R20C5A) was utilized in order to visualize wall-temperature distributions. Several kinds of experiments were carried out in order to clarify the influence of direction and intensity of magnetic fields on the natural convection. It was found that the natural convection of a magnetic fluids could be controlled by the direction and intensity of the magnetic fields.
가진 펌프에 연결된 곡관덕트에서 난류진동유동의 전단응력분포와 압력분포
손현철,이홍구,이행남,박길문,Sohn, Hyun-Chull,Lee, Hong-Gu,Lee, Haeng-Nam,Park, Gil-Moon 한국유체기계학회 2001 한국유체기계학회 논문집 Vol.4 No.4
In the present study, flow characteristics of turbulent oscillatory flow in an oscillator connected to square-sectional $180^{\circ}$ curved duct are investigated experimentally. In order to investigate wall shear stress and pressure distributions, the experimental studies for air flows we conducted in a square-sectional $180^{\circ}$ curved duct by using the LDV system with the data acquisitions and the processing system. The wall shear stress at bend angle of the $150^{\circ}$ and pressure distribution of the inlet (${\phi}=0^{\circ}$) to the outlet (${\phi}=180^{\circ}$) by $10^{\circ}$ intervals of the duct are measured. The results obtained from the experiment are summarized as follows : wall shear stress values in the inner wall we larger than those in an outer wall, except for the phase angle (${\omega}t/{\pi}/6$) of 3, because of the intensity of secondary flow. The pressure distributions are the largest in accelerating and decelerating regions at the bend angle(${\phi}$) of $90^{\circ}$ and pressure difference of inner and outer walls is the largest before and after the ${\phi}=90^{\circ}$.