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정휘권(H.K. Jung),김현수(H.S. Kim),한병윤(B.Y. Han),박형구(H.K. Park) 한국전산유체공학회 2012 한국전산유체공학회 학술대회논문집 Vol.2012 No.5
Recycling process of melted resin after the injection molding is getting popularto reduce the waste of material. It uses two rollers to make the remaining resin into plastic panels. Analysin the thermal/fluid behaviour of the melted resin is important in the roller process. For this the flow analysis of the gravity driven resin has been done between the rotating rollers with constant speed. The temperature of the roller surface which was contacted with resin and the ambient air cyclically was obtained and it was used as the thermal boundary conditions for the thermal behaviour of the resin. The obtained steady-state results showed a reverse flow in the central part in between the rollers. The temperature of the plastic surface was reduced sharply to the one of the roller surface after it was temperature change was slow inner part of the resin due to the phase changing process.
김현수(H.S. Kim),정휘권(H.K. Jung),한병윤(B.Y. Han),박형구(H.K. Park) 한국전산유체공학회 2012 한국전산유체공학회 학술대회논문집 Vol.2012 No.5
The injection molding process is suitable for manufacturing the complicated plastic products. As the customer needs for higher quality products increase, realization of precise dimensional and shape controls is getting more important, For this it is important to obtain uniform cooling procedure over the whole surface of high temperature molded plastic. Failure to this can leads to different shrinkage speed, internal stresses and unwanted shape deformations. It needs to distribute coolant flow rates to main channel and to sub-channels properly for insuring uniform cooling process when there are parallel cooling channels. In this study, three-dimensional turbulent flow simulations for representative parallel cooling channels were performed. To insure intended flow rate to each sub-channels various shape designs for channel system were investigated. The results show that as the Reynolds number increases the effect of shape design are more profound. Through the proper flow distribution, uniform cooling effects would be expected.
김현수(H.S. Kim),정휘권(H.K. Jung),한병윤(B.Y. Han),김영만(Y.M. Kim),박형구(H.K. Park) 한국전산유체공학회 2012 한국전산유체공학회지 Vol.17 No.3
The injection molding process is suitable for manufacturing complicated plastic products. As the customer request higher quality products increase, realization of the precise dimensional and shape controls is getting more important. For this purpose it is important to obtain uniform cooling procedure over the whole surface of the high temperature molded plastic. Failure to this may lead to different shrinkage speed, internal stresses and unwanted shape deformations. It is necessary to distribute coolant flow rates to the main channel and to the sub-channels properly to insure uniform cooling process when there are parallel cooling channels. In this study, three-dimensional turbulent flow simulations for representative parallel cooling channels were performed. To insure the intended flow rate to each sub-channels, various shape designs for the channel system were investigated. The results show that as the Reynolds number increases the effect of shape design is more profound. Through the proper flow distribution, uniform cooling effects would be expected.
직분식 디젤엔진의 흡입·압축 행정시 엔진 실린더 내의 비정상 유동 해석
주경제(K. J. Joo),박형구(H. K. Park) 한국전산유체공학회 2001 한국전산유체공학회 학술대회논문집 Vol.2001 No.-
The transient flow fields in direct injection engines were analyzed by using the STAR-CD CFD code during the intake/compression processes. The analyses were focused on the computation grid generation by using the IC3M code which is a pre-developed and especially well adapted for the analyses of internal combustion engines. The results showed that the used grid generation technique was well suited for the flow analyses on any internal combustion engines.
김현수(H.S. Kim),한병윤(B.Y. Han),이일천(I.C. Lee),김영만(Y.M. Kim),박형구(H.K. Park) 한국전산유체공학회 2011 한국전산유체공학회 학술대회논문집 Vol.2011 No.11
Design of the cooling channels of a plastic injection mold effects the quality and productivity of the injection processes. In the injection process the melted resin with high temperature enter the mold cavity and just after the cavity is filled the heat should be dissipated through the cooling channels simultaneously. The purpose of this study is to analyse the heat transfer phenomenon and to evaluate the temperature distribution in the mold to evaluate the cooling effect of cooling channels. The injection mold has 4 cooling channels of circular cross section and each channel has the same coolant flow rate, and the cavity has the rectangular shape. The results show that as the cooling channels get closer to the cavity surface, the cooling efficiency increases as might easily guessed.
김현수(H.S. Kim),한병윤(B.Y. Han),이일천(I.C. Lee),김영만(Y.M. Kim),박형구(H.K. Park) 한국전산유체공학회 2012 한국전산유체공학회지 Vol.17 No.2
Design of the cooling channels of a plastic injection mold affects the quality and the productivity of the injection processes. In the injection process, the melted resin with high temperature enters the mold cavity, and just after the cavity is filled the heat should be dissipated through the cooling channels simultaneously. The purpose of this study is to analyse the heat transfer phenomenon and to estimate the temperature distribution in the mold to evaluate the cooling effect of the channels. The injection mold is assumed to have cooling channels of circular cross section and each channel has the same coolant flow rate. and The cavity has a rectangular shape. The results show that as the cooling channels get closer to the cavity surface, the cooling efficiency increases as might easily be guessed. However, due to the final hot resin flow from the gate an intensive cooling is required in that region.
김현수(H.S. Kim),한병윤(B.Y. Han),박형구(H.K. Park) 한국전산유체공학회 2011 한국전산유체공학회 학술대회논문집 Vol.2011 No.5
The battery pack, a main component of NEV(Neighborhood Electric Vehicle), needs cooling system when it is charging or discharging to prevent the degradation of the battery charging efficiency. The purpose of this study is to analyse the effects of cooling methods, changing positions of inlet and outlet and changing area ratios of inlet and outlet. It has been observed that in the point of uniform cooling, suction from the exit side is more efficient than blowing from the inlet. And there is a suitable inlet/outlet area ratio in maximizing the mass flow rate. The numerical analyse using a commercial code STAR-CCM+ version 4.02 were used for the study.
직분식 디젤엔진의 흡입ㆍ압축 행정시 엔진 실린더 내의 비정상 유동 해석
주경제(K. J. Joo),박형구(H. K. Park) 한국전산유체공학회 2002 한국전산유체공학회지 Vol.7 No.2
The transient flow fields in a direct injection engine was analyzed by using the STAR-CD CFD code during the intake/compression processes. The analyses were focused on the computation grid generation by using the IC3M code which is a pre-developed and especially well adapted for the analyses of internal combustion engine. The results showed that the used grid generation technique was well suited for the flow analyses on any internal combustion engine.
김현수(H.S. Kim),한병윤(B.Y. Han),박형구(H.K. Park) 한국전산유체공학회 2011 한국전산유체공학회지 Vol.16 No.3
The battery pack o main component of NEV (Neighborhood Electric Vehicle), needs cooling system when it is charging or discharging to prevent the degradation of the battery charging efficiency. The purpose of this study is to analyse the effects of cooling methods, changing positions of inlet and outlet and changing area ratios of inlet and outlet. It has been observed that in the point of uniform cooling, suction from the exit side is more efficient than blowing from the inlet. And there is a suitable inlet/outlet area ratio in maximizing the mass flow rate. A commercial code, STAR-CCM+(ver. 4.02), was used for the numerical study.
주경제(K.J. Joo),박형구(H.K. Park) 한국전산유체공학회 2002 한국전산유체공학회 학술대회논문집 Vol.2002 No.-
The transient flow fields in direct injection engine was analyzed by using the STAR-CD CFD code during the intake/compression processes. The grids are generated by using the IC3M, The CFD results were compared with experimental data, The results showed that the used techniques were well suited for the flow analyses on any internal combustion engines.