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An Experimental Study on Heat Thansfer Characteristics of Carbon Dioxide During Gas Cooling Process in A Horizontal Tube

An Experimental Study on Heat Thansfer Characteristics of Ca...

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第二届亚洲制冷空调大会

作者： Chang-Hyo Son Dong-Geon Lee Si-Young Jeong Young-Lyoul kim Hoo-Kyu Oh Dept. of Ref. eng. Graduate school Pukyong Univ. Busan Korea Dept. of Refrigeration eng. Graduate school Pukyong Univ. Busan Korea Dept. of Mech. engineering. Sogang University Seoul Korea Cleaner Production Technology Center KITECH Chonan Korea Dept. of Refrigeration eng. Pukyong University Busan Korea

The heat transfer coefficient and pressure drop during g as cooling process of CO(R-744)in a horizontal tube were investigated experimentally. The experiments were conducted withoutoil in the refrigerant loop. The main components of the refrigerant loop are a receiver, avariable-speed pump, a mass flow meter, a pre-heater and a gas cooler(test section). The waterloop consists of a variable speed pump, an isothermal tank, and a flow meter. The refrigerant,circulated by the variable-speed pump, condenses in the inner tube while water flows in theannulus. The gas cooler is 6000 mm in length, and it is divided into 12 subsections. The pressuredrop of CO in the gas cooler shows a relatively good agreement with those predicted byBlasius’s correlation. The local heat transfer coefficient of CO agrees well with the correlationby Bringer-Smith. However, at the region near Pseudo -critical temperature, the experimentsindicate higher values than the Bringer-Smith correlation. Based on the experimental datapresented in this paper, a new correlation to predict the heat transfer coefficient of supercriticalCO during in-tube cooling was developed. The deviation between the experimental values andthe values predicted by the new correlation is within 18%.

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Importance of Curing Time and Temperature of Asphalt Mixture in Measured Mechanical Properties

Importance of Curing Time and Temperature of Asphalt Mixture...

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4～(th) International Conference on Road & Airfield Pavement Technology

作者： K.W.kim H.R.Oh S.J.Lee S.J.Kweon Professor Department of Regional Infrastructure eng. Kangwon National University Chunchon South Korea Staff Dasung engineering Co. Chunchon South Korea Researcher Center for Advanced Mineral Aggregate Composites Kangwon National University Chunchon South Korea Professor Department of Civil engineering Samchuck National University Samchuck South Korea

＜正＞ Among the most widely used characteristics of asphalt mixture are Marshall stability and indirect tensile strength （ITS）. This study examines importance of conditioning temperature and period before measuring these properties. Marshall specimens are conditioned by submerging in 60℃ water for 30 rain before loading. It was observed that ifthe specimen is cured in a lower （or higher） than normal lab temperature （25℃） before submerging, the measured values were not consistent. If the specimen is cured in lower temperature than normal, it should be submerged longer than 30 min at 60℃ for Mar- shall test. In ITS test on the specimens which were cured at different temperatures, it was found that keeping the temperature at 25℃ is very important in final result. Although there is no regulation specifying how long the specimen should be conditioned before testing, the specimen should be conditioned long enough time to secure it to be at 25℃. It was also found that if lab air temperature is lower or higher than normal, mixture was not properly cured, and test results were not reliable.

关键词： Marshall stability asphalt mixture curing conditioning temperature ITS

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A Robust Approach for the Derivation of Closed-Form Green’s Functions for Microstrip Structures

A Robust Approach for the Derivation of Closed-Form Green’s...

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第六届无线与电波传播国际会议（ISAPE）

作者： E. J. kim Y. S. Lee J. H. Ko Y. K. Cho Schoolof Electronic eng. Kumoh National Institute of Technology Schoolof Electronic eng. Kumoh National Institute of Technology Schoolof Electronic eng. Kumoh National Institute of Technology Schoolof Electronic eng. & Computer Sci. Kyungpook National University

A robust approach for the derivation of closed-form Green’s functions is considered based upon a three level approximation procedure, which can give more accurate evaluation of the spatial Green’s fu

关键词： A Robust Approach for the Derivation of Closed-Form Green s Functions for Microstrip Structures

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Electrostatic Sprayer of Agricultural Chemicals

Electrostatic Sprayer of Agricultural Chemicals

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The Fourth International Conference on Applied Electrostatics

作者： T.G.Kang D.H.Lee K.Y.Ryu H.J.kim C.S.Lee J.D.Moon National Agricultural Mechanization Research Institute Suwon Gyeonggi-Do 441-100 Korea National Agricultural Mechanization Research Institute Suwon Gyeonggi-Do 441-100 Korea National Agricultural Mechanization Research Institute Suwon Gyeonggi-Do 441-100 Korea National Agricultural Mechanization Research Institute Suwon Gyeonggi-Do 441-100 Korea National Agricultural Mechanization Research Institute Suwon Gyeonggi-Do 441-100 Korea Dept. of Electrical eng. Kyungpook National University Daegu 702-701 Korea

＜正＞Spraying is one of the most efficient methods for pesticide and insecticide control. Generally, Speed Sprayer （Air carrier sprayer） is used for spraying in Korea when Speed Sprayer is used but chemical deposition amount on crops is only 20% of total spraying amount. Agricultural chemicals which fail to reach the crops not only cause environmental contamination but losses of agricultural chemicals by lower deposition efficiency. In this research, laboratory test was carried out to determine the optimum design conditions of electrostatic agricultural nozzles for orchard applications. Parameters studied were type of electrode, the diameter of nozzle, and tilt angle of metal leaf. The results showed that the coverage area ratios and number of droplets for electrostatic nozzle were increased proportionally with the charging voltage. However, it appeared those electrical potentials higher than 4.5kV caused electrical discharge between nozzle body and electrode. Electrostatic nozzles resulted in significantly higher coverage area ratios than that of conventional nozzles. The optimum nozzle diameter and charging voltage in pin type electrode were found to be 0.59 mm and 4.0 kV, respectively.

关键词： Agricultural machine Speed Sprayer (Air carrier sprayer) Electrostatic Agricultural chemicals

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