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Numerical study of effects of accommodation coefficients on slip phenomena
최영재,권오준 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.5
An unstructured mesh Navier-Stokes solver employing a Maxwell slip boundary condition was developed. The present flow solverwas applied to the simulation of flows around an axisymmetric hollow cylinder in a Mach 10.4 freestream, known as Calspan-UB ResearchCenter (CUBRC) Run 14 case, and the velocity slip and the temperature jump on the cylinder surface were investigated. The effectof tangential momentum and thermal accommodation coefficients used in the Maxwell condition was also investigated by adjustingtheir values. The results show that the reverse flow region is developed on the body surface due to the interaction between the shock andthe boundary layer. Also, the shock impingement makes pressure high. The flow properties on the surface agree well with the experimentaldata, and the velocity slip and the temperature jump vary consistently with the local Knudsen number change. The accommodationcoefficients affect the slip phenomena and the size of the flow region. The slip phenomena become larger when both tangential momentumand thermal accommodation coefficients are decreased. However, the range of the reverse flow region decreases when the momentumaccommodation coefficient is decreased. The characteristics of the momentum and thermal accommodation coefficients also areoverlapped when they are altered together.
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최영재,조아라,신정훈,이석우,최헌종 한국경영과학회 2009 한국경영과학회 학술대회논문집 Vol.2009 No.5
Unpredictable customer needs strongly require for manufacturing enterprises to produce quality products satisfying cost and time constraints. To cope with such dynamically changing manufacturing environment and to get higher competitiveness, the manufacturing industry needs to equip with advanced technologies including IT as well as substantial infrastructure. “i-Manufacturing” is the name of the project funded by the Korea government, and it is also the strategy for achieving manufacturing innovation in Korea. The most basic but important concept of the i-Manufacturing is “collaboration”. As a part of the project, we are developing various kinds of web-based collaboration systems for managing product and production information as well as processes. We applied IT into conventional manufacturing industry by developing strategic business models and collaboration systems. As a consequence, many Korean SMEs are currently using 9 different collaboration systems and they are reducing manufacturing cost and delivery time while increasing product quality and profit. In this paper, therefore, we first introduce the i-Manufacturing and it"s effects. The 9 collaboration system we have developed will also introduced. The strategy for evolving manufacturing innovation focused on spreading the collaboration systems will introduced the end of this paper.
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