检索结果-南通市图书馆

Effects of Thermal Radiation on a 3D Sisko Fluid over a Porous Medium Using Cattaneo-Christov Heat Flux Model

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2018年第8期69卷 230-238页

作者： deog-hee doh M.Muthtamilselvan E.Ramya P.Revathi Division of Mechanical Engineering College of EngineeringKorea Maritime and Ocean UniversityBusan 606 791South Korea Department of Mathematics Bharathiar UniversityCoimbatore-641 046TamilnaduIndia

This paper investigates the three-dimensional flow of a Sisko fluid over a bidirectional stretching sheet, in a porous medium. By using the effect of Cattaneo-Christov heat flux model, heat transfer analysis is illustrated. Using similarity transformation the governing partial differential equations are transferred into a system of ordinary differential equations that are solved numerically by applying Nachtsheim-Swigert shooting iteration technique along with the 6-th order Runge-Kutta integration scheme. The effect of various physical parameters such as Sisko fluid, ratio parameter,thermal conductivity, porous medium, radiation parameter, Brownian motion, thermophoresis, Prandtl number, and Lewis number are graphically represented.

关键词：热流动多孔液体 Runge-Kutta 放射模特儿 Brownian 3D

Temperature Distribution and Thermal Stresses in Various Conditions of Moving Heating Source during Line Heating Process

在线全文

学校读者我要写书评

暂无评论

Journal of Thermal Science 2012年第1期21卷 82-87页

作者： Yoon Hwan Choi Yeon Won Lee Kwang Choi deog hee doh Kyoung Joon Kim Department of Mechanical and Automotive Engineering Pukyong National University Steel Structure Research Division Research Institute of Industrial Science & Technology Division of Mechanical and information Engineering Korea Maritime University

Line heating method is widely used to manufacture curved surfaces in ship building. The main factors governing the quality of the manufactured products are the moving velocity of the heating source, heating strength, and heating ways. In this study, the temperature distributions of the heated plate were investigated with the condition that the line heating process was automatic. The temperature variations were also investigated with the changes of those three variables. The numerical results showed that the peak temperature decreased as the moving velocity of the heating source increased. It also revealed that the peak temperatures changed linearly with the changes of the heating source.

关键词：移动热源温度分布热应力种条移动速度峰值温度船舶建造加热方法

Analysis of the Sloshing Flows of a LNG Cargo Tank

在线全文

学校读者我要写书评

暂无评论

Journal of Thermal Science 2011年第5期20卷 442-448页

作者： deog hee doh Hyo Je Jo Byeong Rog Shin Min Cheol Ryu Yoon Sik Hwang Division of Mechanical and Information Eng. Korea Maritime University Division of Naval Architecture and Ocean Systems Eng. Korea Maritime University Department of Mechanical Engineering Changwon National University Fluid Dynamics R&D Team DSMEGeoje-siKorea

The sloshing flows in a LNG cargo tank model(1/50 scale) of a ship are measured by an embedded panoramicPIV *** measurement system consists of a Nd-Yag laser(120mJ,15Hz),two cameras(1k x 1k) and a host *** experimental cases were tested for the tank model,in which swaying motions are made by a 6 DOF-motion *** amplitudes of swaying are 9.76mm and 29.29mm,and the swaying frequencies are 0.633Hz and *** measurement regions are the vertical plane 50mm away from the front wall of the tank where a pump tower is *** was verified that the flow patterns of the sloshing are similar to each other when the swaying amplitudes are similar.

关键词：流动分析 LNG 晃动六自由度运动平台货舱坦克模型测量系统 PIV系统

Performance Improvements in Temperature Reconstructions of 2-D Tunable Diode Laser Absorption Spectroscopy(TDLAS)

在线全文

学校读者我要写书评

暂无评论

Journal of Thermal Science 2016年第1期25卷 84-89页

作者： Doo-Won Choi Min-Gyu Jeon Gyeong-Rae Cho Takahiro Kamimoto Yoshihiro Deguchi deog-hee doh Tokushima University 2-1 Minamijyosanjima TokushimaJapan Korea Maritime&Ocean University Dongsam-dong 1 Youngdo-guBusan 606-791Korea

Performance improvement was attained in data reconstructions of 2-dimensional tunable diode laser absorption spectroscopy(TDLAS). Multiplicative Algebraic Reconstruction Technique(MART) algorithm was adopted for data reconstruction. The data obtained in an experiment for the measurement of temperature and concentration fields of gas flows were used. The measurement theory is based upon the Beer-Lambert law, and the measurement system consists of a tunable laser, collimators, detectors, and an analyzer. Methane was used as a fuel for combustion with air in the Bunsen-type burner. The data used for the reconstruction are from the optical signals of 8-laser beams passed on a cross-section of the methane flame. The performances of MART algorithm in data reconstruction were validated and compared with those obtained by Algebraic Reconstruction Technique(ART) algorithm.

关键词：可调谐二极管激光吸收光谱性能温度二维代数重建技术可调谐激光器数据重构测量原理

Blood flow Interpretation in Femoral Pseudoaneurysm

在线全文

学校读者我要写书评

暂无评论

Journal of Thermal Science 2013年第3期22卷 229-233页

作者： Sang-Ho Suh Young Ho Choi Hyoung-Ho Kim Min-Gyu Jeon deog-hee doh Dept. of Mechanical Engineering Soongsil University Department of Radiology Seoul Nat'l University Boramae Hospital Graduate School Korea Maritime Univ. Division of Mechanical and Energy Systems Engineering Korea Maritime University

A femoral artery pseudoaneurysm is one complication of vascular intervention, and the incidence is increasing. Early management is then needed to avoid potential dangers from it. It differs from a true aneurysm in that it doesn't include any component of the vascular wall, and is not studied as much as a true aneurysm. Here, a model of a femoral pseudoaneurysm was made and a Computational Fluid Dynamics(CFD) simulation was verified with PIV experiment. Afterwards, a CFD simulation with two different models was performed to look for any findings which may help in developing new treatment methods.

关键词： Femoral Artery, Pseudoaneurysm, Numerical and PIV experimental Interpretation

Development of a Concentration Measurement Technique for Steady State Solid-liquid Mixing using a Neural Network

在线全文

学校读者我要写书评

暂无评论

Journal of Thermal Science 2013年第5期22卷 478-483页

作者： deog hee doh Joo Ho Yum Gyeong Rae Cho Myung Ho Kim Gyong Won Ryu Masahiro Takei Division of Mechanical and Energy Systems Engineering Korea Maritime UniversityYeongdo-gu Busan Korea Graduate School Korea Maritime UniversityYeongdo-gu Busan Korea R&D Institute-5 Agency for Defense DevelopmentJochiwongil 462Yuseong Daejeon 305-152 Korea Graduate School of Mechanical Engineering Artificial Science Division Chiba UniversityJapan

A measurement technique that can measure the concentration of the solid particles in liquid flow was *** measurement system consists of a color camera and three LCD *** solid particles were put at the bottom of a cylindrical mixing tank in which JetA1 oil was *** mixing of the solid particles was performed by rotating a propeller type agitator with three different rotation speed(500,600,700 r/min).Mixing state was visualized by the LCD displays and a color *** color intensity of the glass particles changes with their *** color information was decoded into three principle colors R,G,and B so that,the calibration curve of color-to-concentration was performed using these information.A neural network was used for this *** transient concentration field of the solid particles was quantitatively visualized.

关键词：测量技术固液混合神经网络浓度场液晶显示器彩色摄像机固体颗粒颜色信息

Performance Analyses for a Cyclone Type Filter

在线全文

学校读者我要写书评

暂无评论

Journal of Thermal Science 2015年第3期24卷 290-294页

作者： Hyoung-June Kim Masahiro Takei Hyun Jin Lee Yeon Won Lee Yoon Hwan Choi deog-hee doh School of Mechanical Engineering Artificial Science Division Chiba University Division of Mech. and Energy Systems Eng. Korea Maritime University Dept. of Mechanical and Automotive Engineering Pukyong National University

Flow characteristics inside a cyclone filter were investigated by the use of computational fluid dynamics(CFD). For computations, SST model was adopted. Parametric study was carried out considering the filtering performance. Revolution speeds were changed from 100 to 550 with 50 increments. A skirt is the driving source for cyclone operation. The influence of several design factors, such as the skirt length, the skirt gap and the return length to filtering performance was investigated under the particle diameter 100μm of debris material(Al, s.g.=2.7). The filtering performance was also investigated with the skirt length 28 mm changing the debris diameters from 1μm to 50μm. The flow rate of the working fluid was maintained at 0.55kg/s. It has been verified that the most influential factors to the filtering efficiencies was the skirt gap between the cyclone generator and the cyclone vessel.

关键词：过滤器旋风式性能分析计算流体动力学滤波性能流量特性设计因素过滤性能

Structural insights on anti-biofilm mechanism of heated slightly acidic electrolyzed water technology against multi-resistant Staphylococcus aureus biofilm on food contact surface

在线全文

学校读者我要写书评

暂无评论

Food Science and Human Wellness 2024年第3期13卷 1556-1566页

作者： Pianpian Yan Ramachandran Chelliah Kyoung hee Jo Xiuqin Chen Akanksha Tyagi Hyeon Yeong Jo Fazle Elahi Nam Chan Woo Min Seung Wook deog Hwan Oh Department of Food Science and Biotechnology College of Agriculture and Life SciencesKangwon National UniversityChuncheon 24341South Korea Kangwon Institute ofInclusive Technology(KIIT) Kangwon National UniversityChuncheon 24341South Korea Saveetha School of Engineering (SIMATS)UniversitySriperumbudur 600124India Seoulin Bioscience Company Seongnam-si 13488South Korea

Slightly acidic electrolyzed water(SAEW)has proven to be an efficient and novel sanitizer in food and agriculture *** study assessed the efficacy of SAEW(30 mg/L)at 40℃on the inactivation of foodbome pathogens and detachment of multi-resistant Staphylococcus aureus(MRSA)*** underlying mechanism of MRS A biofilm under heated SAEW at 40℃treatment on metabolic profiles was *** results showed that the heated SAEW at 40℃significantly effectively against foodbome pathogens of 1.96-7.56(lg(CFU/g))reduction in pork,chicken,spinach,and *** heated SAEW at 40℃treatment significantly reduced MRS A biofilm cells by 2.41(lg(CFU/cm^(2))).The synergistic effect of SAEW treatment showed intense anti-biofilm activity in decreasing cell density and impairing biofilm cell *** metabolic response of MRSA biofilms,treated by SAEW at 40℃,revealed the alterations of intracellular metabolites,including amino acids,organic acid,fatty acid,and ***,signaling pathways involved in amino acid metabolism,energy metabolism,nucleotide synthesis,carbohydrate metabolites,and lipid biosynthesis were functionally disrupted by the SAEW at 40℃*** per our knowledge,this is the first research to uncover the potential mechanism of heated SAEW treatment against MRSA biofilm on food contact surface.

关键词： Multi-resistant Staphylococcus aureus Metabolic profile SAEW Biofilm Hurdle technology Electrode material

Performances of Volume-PTV and Tomo-PIV

在线全文

学校读者我要写书评

暂无评论

Open Journal of Fluid Dynamics 2012年第4期2卷 368-374页

作者： deog hee doh Chang Jae Lee Gyeong Rae Cho Kyeong Rok Moon Division of Mechanical and Energy Systems Engineering Korea Maritime University Busan Korea LG Electronics Home Appliance Changwon Korea

We constructed a volume particle-tracking velocimetry (Volume-PTV) algorithm for comparisons with the tomographic particle image velocimetry (Tomo-PIV) algorithm, in which the multiplicative algebraic reconstruction technique (MART) was adopted. Performance tests on both algorithms were conducted by using artificial images generated through numerical data sets. Standard data on an impinging jet were used to test the Volume-PTV algorithm, whereas ring vortex data were used to test the Tomo-PIV algorithm. The influence of the number of particles (particle density in volume) on the key factors of Volume-PTV, such as particle movements and particle neighborhoods, were investigated. Furthermore, the effects of particle density and sizes onto the recovery ratio of the vectors were evaluated.

关键词： Volume-Particle-Tracking Velocimetry Tomographic-Particle Image Velocimetry Ring Vortex Recovery Ratio