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Flow visualization and numerical analysis of a new mixing equipment with vibratory fins
Yoshihito Kato,이영세,Setsuro Hiraoka,Shogo Fukumoto,Yutaka Tada,Yuichiro Nagatsu,Ryushin Ohmasa,Sung Tae Koh 한국화학공학회 2010 Korean Journal of Chemical Engineering Vol.27 No.1
The mixing performance of a new type of mixing equipment which has several fin oscillators on a pair of shafts with a vibrating motor was investigated. This mixing equipment, which is mainly used for industrial plating processes, was usually operated at a vibrating frequency of about 40 Hz with the amplitude 1mm. The flow visualization in this equipment showed that the flow in the vessel at laminar flow region was vertically divided into two distinct symmetric regions. The numerical simulation of the flow and the mixing patterns agreed well with the visualization result at laminar flow region.
Kato, Yoshihito,Tada, Yutaka,Urano, Kunihiko,Hattori, Masahiro,Nagatsu, Yuichiro,Koh, Song-Tae,Lee, Young-Sei 社団法人 化学工学会 2010 化學工學論文集 Vol.36 No.1
<P>Numerous studies on power consumption in mixing vessels have been reported, and several power correlations have been developed for non-baffled mixing vessels, for example, Nagata's correlations. However, baffled mixing vessels with different impeller geometries have different power numbers. In this paper, the effects of vessel bottom shape, number of blades, and impeller position on power number were measured for several impellers with geometries that had been assumed to have the same power in Nagata's concept. It was found that power numbers in baffled vessels varied greatly with impeller geometry, while Nagata's concept is valid for non-baffled vessels, regardless of impeller position.</P>
김문갑,이영세,Kato,Yoshihito 한국화학공학회 2001 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.39 No.5
교반조내 고점도 유체에 대한 패들 임펠러의 2차원 수치해석 결과를 기초로 지배방정식과 경계조건으로부터 도출된 파라미터를 이용하여 교반임펠러와 교반조벽 사이의 간격이 작은 대형 임펠러로부터 간격이 큰 소형 임펠러에 걸쳐서 광범위하게 적용 가능한 교반소요동력 상관식을 얻었다. 이 상관식에 임펠러 형상을 고려해 넣은 보정 파라미터를 도입하여 앵커 임펠러 및 복잡한 기하형상을 가진 헬리컬 리본 임펠러에도 적용 가능한 수정된 동력상관식을 얻었다. An attempt has been made to investigate a correlation of power consumption in a laminar region which is based on numerical analysis of two-dimensional flow for paddle impeller in an agitated vessel using geometrical parameters derived theoretically from the govering equations and boundary conditions. It is suggested that the proposed model can be widely adapted from large impeller which has small clearance to small impeller which has large clearance between impellers and agitated wall. Also, a modified model was proposed by introducing correction factors with impeller geometries, which can be applied to paddle, anchor and helical ribbon impellers.
Development of Low Voltage 2 Level IGBT Inverter and Converter for Industrial Applications
Tetsuya Okamoto,Yusuke Ishida,Yoshihito Kato,S. Miyazaki 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
This paper presents a new IGBT based AC drive inverter and its DC source converter, which were developed for industrial applications. AC drive inverter provides some benefits to customer, very large capacity for an induction motor, a compact footprint and a secured safety stop sequence which is compliant with ISO/IEC functional safety standard. And DC source converter to supply DC input power to AC drive system also provides some benefits as same as AC drive inverter. In addition, it is expected that new PWM control “Instantaneous Current Control PWM (IccPWM)” can improve performance to suppress a harmful harmonics against other surrounding devices and provide a simple harmonic filter to comply with IEEE-519 harmonic limits.
8자 진동교반에 의한 교반조내 유동상태 및 물질전달 특성
이영세 ( Young Sei Lee ),가등정인 ( Yoshihito Kato ) 한국화학공학회 2015 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.53 No.2
8자 진동교반조에 대해 실험적으로 유동상태를 관찰하여 혼합 가시화, 소요동력, 고-액 및 기-액 물질이동에 대한 여러가지의 특성을 측정하였다. 진동수가 증가하면 유동상태, 혼합시간 소요동력 및 물질이동계수는 규칙적으로 변하지 않으므로 조작조건의 선정이 중요하다. 어떤 진동수에서라도 Fr = 0.095 이상에서는 실험적으로 명확하게 되었다. 이때교반조내 유체는 선회류형으로 되어 혼합에 적합한 상태가 되고, 8자 진동교반에서의 최적 조작범위는 왕복 진동교반 보다도 넓었다. 8자 진동교반과 기존의 선회진동교반내의 고-액간 물질이동계수는 완전히 같은 식으로 상관되었다.또한 기-액간 물질이동용량계수도 기존의 선회진동교반에서의 식과 같은 형태의 상관식으로 나타났다. The flow pattern and the solid-liquid mass transfer coefficient in figure-eight shaking vessels were observed by experimental method. The flow patterns, mixing time, power consumption and mass transfer coefficient in the figureeight shaking vessels changed irregularly with increase in the shaking frequency. Any frequency, even in the Fr = 0.095 or more became clear experimentally. The region of the optimum operating condition of the figure-eight shaking was larger than that of the reciprocal shaking. The solid-liquid mass transfer coefficient was correlated with the same correlation as that of the rotary shaking vessel of existing. The gas-liquid mass transfer coefficient of the figure-eight shaking vessel was also correlated with the same type of correlation as that of the rotary shaking vessel of existing.
이영세(Young-Sei Lee),김문갑(Moon-Gab Kim),요시히토카토(Yoshihito Kato) 한국산업융합학회 1999 한국산업융합학회 논문집 Vol.2 No.2
Shake mixing has been widely used in cell culture. The' mixing performance for shake mixing, however, has not been reported quantitatively. The critical circulating frequency and the power consumption for complete suspension of particles, based on the definition of Zwietering, were measured in a shaking vessel containing a solid-liquid system. The critical suspension frequency was correlated by the equation from Baldi's particle suspension model modified with the physical properties of the particles. Critical suspension frequency was correlated as following;<br/> ??<br/> The power consumption at the critical suspension condition in the shaking vessel was less than that in an agitated vessel with impeller.<br/> <br/>
이영세(Young-Sei Lee),김문갑(Moon-Gab Kim),김종식(Jong-Shik Kim),식이문(Takafumi Ue),가등정인(Yoshihito Kato) 한국산업융합학회 2003 한국산업융합학회 논문집 Vol.6 No.1
Based on the flow patterns of cylindrical vessel, the flow patterns of conical vessel, spherical vessel, rectangular vessel and cylindrical vessel with baffles were visualized by a trace method using aluminum powder. In addition, the correlations of the critical circulating frequency for mixing were derived from the experimental results. The conical and spherical vessels which have circular cross sections were same effective as cylindrical vessel for the shake mixing due to developing the rotational flow. Both a rectangular vessel and a cylindrical vessel with baffles should not be adapted for shake mixing because of not developing rotational flows in these type of vessels.