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RISS 인기검색어
- 검색키워드
- 저자 : Jong Soon Nam(남종순) (검색결과 5 건)
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남종순(Jong Soon Nam),이종성(Jong Sung Lee),김회동(Heuy Dong Kim) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
Hysteresis phenomena in fluid flow system have the attention of many researchers for their industrial and engineering applications. However, the hysteresis phenomena in the supersonic internal flow with shock wave have not been investigated compared to those in the supersonic external flow with shock wave satisfactorily. The present work aims at investigating the unsteady behavior of shock position with a three types of two-dimensional supersonic nozzle using CFD. The present computational results were validated with previous experimental data. Unsteady, compressible, axisymmetric, Navier-Stocks equations with Spalart-Allmaras one-equation turbulence model were solved using a fully implicit finite volume scheme. The result obtained with relationship of between the nozzle area expand ratio and hysteresis phenomenon were discussed.
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남종순(Jong Soon Nam),김규완(Gyu Wan Kim),김진현(Jin Hyeon Kim),김희동(Heuy Dong Kim) 대한기계학회 2013 大韓機械學會論文集B Vol.37 No.7
공압 부상은 베르누이 원리에 기초한다. 그러나 공압 부상 방법은 제품의 원가 상승의 요인이 되는 대량의 유량을 소모하는 것으로 알려져 있다. 이 논문에서는 베르누이 부상 유동의 통찰력을 얻기위해 수치 해석 연구를 수행하였다. 3차원 압축성 Navier-Stokes 방정식과 SST k-ω 난류모델에 유한 체적법을 적용하여 계산하였다. 기체 유량, 공정 제품의 직경 그리고 원형실린더와 공정 제품사이의 간극을 다양하게 변화하여 공정 제품 주위의 유동 특성을 조사하였다. 그 결과 부상력을 위한 최적의 간극과 공급 기체 유량이 증가하면 큰 부상력이 발생한다는 것을 알았다. Pneumatic levitation is based upon Bernoulli’s principle. However, this method is known to require a large gas flow rate that can lead to an increase in the cost of products. In this case, the gas flow rate should be increased, and the compressible effects of the gas may be of practical importance. In the present study, a computational fluid dynamics method has been used to obtain insights into Bernoulli levitation flows. Three-dimensional compressible Navier-Stokes equations in combination with the SST k-ω turbulence model were solved using a fully implicit finite volume scheme. The gas flow rate, workpiece diameter,and clearance gap between the workpiece and the circular cylinder were varied to investigate the flow characteristics inside. It is known that there is an optimal clearance gap for the lifting force and that increasing the supply gas flow rate results in a larger lifting force.
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남종순(Jong Soon Nam),Md. Alim Iftekhar Rasel,G.Rajesh,김희동(Heuy Dong Kim) 한국전산유체공학회 2012 한국전산유체공학회 학술대회논문집 Vol.2012 No.5
Recently, non-contact handling approaches are attracting much attention in the field of semiconductor production processes such as wafer which is handled frequently during repeated loading and unloading. Since the contact handling often leads to damaging and contaminating the products, it is highly desirable to get effective non-contact handling for the improvement of the product quality. Many non-contact methods making use of magnetic, electrostatic, acoustic and pneumatic levitations of a work piece have been proposed to date. A number of investigations are being made on the pneumatic levitation since it is magnetic free with little heat and can be easily applied to any kind of materials. The pneumatic levitation is based upon Bernoulli principle. However, this method is known to consume large gas flow rate which can be the cost rise of products. Moreover, the recent trend of wafer is increasing its size so that more power is required to lift up and transport the wafer. In this case, the gas flow rate should be increased and the compressibility effects of gas may be of practical importance. In the present paper, a computational fluid dynamics method has been used to get insight into the Bernoulli levitation. A circular plate of work piece was employed as a model of wafer. The 3-dimensional compressible Navier-Stokes equations furnished with the SST k-ω turbulence model were solved using a fully implicit finite volume scheme. The gas flow rate, the diameter of work piece and the inlet nozzle and the clearance gap between the work piece and the circular cylinder were varied to investigate the flow characteristics around the work piece. The levitation force was analyzed in terms of the gas flow rate and the clearance gap. It is known that there is an optimal clearance gap for the lifting force and increasing the supply gas flow rate results in a larger lifting force.
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김규완(Gyu Wan Kim),김진현(Jin Hyeon Kim),남종순(Jong Soon Nam),김희동(Heuy Dong Kim) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.11
More attentions have been paid on non-contact handling approaches in the field of semiconductor production process, especially the application in wafer. Since the contact handling always leads to damaging and contaminating of the products, it is highly desirable to get effective non-contact handling for improvement of the product quality. The pneumatic levitation is based upon Bernoulli principle. However, this method is known to consume large gas flow rate which can rise the cost of products. Moreover, the recent trend of wafer is increasing its size so that more power is required to lift up and transport the wafer. In this case, the gas flow rate should be increased and the compressible effects of gas may be of practical importance. In the present paper, a computational fluid dynamics method has been used to get insight into the Bernoulli levitation. A circular plate of work piece was employed as a model of wafer. The 3-dimensional compressible Navier-Stokes equations furnished with the SST k-ω turbulence model were solved using a fully implicit finite volume scheme. Gas flow rate, diameter of work piece and the clearance gap between work piece and circular cylinder were varied to investigate the flow characteristics inside. The levitation force was analyzed in terms of gas flow rate and clearance gap. It is known that there is an optimal clearance gap for the lifting force and increasing the supply gas flow rate results in a larger lifting force.
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