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Fluid-particle interaction simulations of the interception of red blood cells in shear flow
최청렬,김창녕 대한기계학회 2010 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.24 No.7
Numerical simulations of the motion of red blood cells (RBCs) freely suspended in shear flow have been successfully performed to investigate the nature of pairwise interception of RBCs using a fluid-particle interaction method based on the arbitrary Lagrangian-Eulerian (ALE) method and a dynamic mesh method. The applicability of the interaction method that we used was validated by comparing the simulation results with an analytical solution for an elliptical particle in shear flow. We found that positive and negative transverse shifts of the RBCs take place during the interceptions, yielding a non-zero RBC self-diffusivity, and that a phase shift occurs during the rotating behavior and lasts even after the separation. The behaviors of the approaching RBCs are adjusted by interactions with the surrounding flow fields during interception. The pressure between a pair of RBCs causes either an attractive or repulsive force. The nature of the pairwise interception is influenced not only by the flow fields but also by kinematic characteristics (i.e., instantaneous translational and rotational behavior) of the two RBCs.
최청렬,김창녕,Choi, Choeng Ryul,Kim, Chang Nyung 대한기계학회 1999 大韓機械學會論文集B Vol.23 No.10
Characteristics of two-phase flow and heat transfer were numerically investigated in a submerged gas Injection system. Effects of both the gas flow rate and bubble size were investigated. In addition, heat transfer characteristic and effects of heat transfer were investigated when temperature of the injected gas was different from that of the liquid. The Eulerian approach was used for the formulation of both the continuous and the dispersed phases. The turbulence in the liquid phase was modeled by the use of the standard $k-{\varepsilon}$ turbulence model. The interphase friction and heat transfer coefficient were calculated by means of correlations available in the literature. The turbulent dispersion of the phases was modeled by introducing a "dispersion Prandtl number". The plume region and the axial velocities are increased with increases in the gas flow rate and with decreases in the bubble diameter. The turbulent flow field grows stronger with the increases in the gas flow rate and with the decreases in the bubble diameter. In case that the heat transfer between the liquid and the gas is considered, the axial and the radial velocities are decreased in comparison with the case that there is no temperature difference between the liquid and the gas when the temperature of the injected gas is higher than the mean liquid temperature. The results in the present research are of interest in the design and the operation of a wide variety of material and chemical processes.
Gas Bubble Driven Circulation Systems에서의 이상유동 특성의 시뮬레이션
최청렬 한국시뮬레이션학회 1998 한국시뮬레이션학회 논문지 Vol.7 No.2
The flow fields in Gas Bubble Driven Circulation Systems were numerically analyzed. In various gas flow rate and bubble size, the flow characteristics were predicted. Eulerian-Eulerian approach was used for the formulation of both the continuous and dispersed phases. The modification of the general purpose computer program PHOENICS code was employed to predict the mean flow fields, turbulent characteristics, gas dispersion, volume fraction. The predicted shows very satisfactory agreement with experimental results for all regions of ladle. The results are of interest in the design and operation of wide variety of material processing.
최청렬,김창녕 대한설비공학회 1999 설비공학 논문집 Vol.11 No.6
Characteristics of two-phase flow and heat transfer were numerically investigated in a submerged gas injection system when temperature of the injected gas was different from that of the liquid. The Eulerian approach was used for both the continuous and dispersed phases. The turbulence in the liquid phase was modeled using the standard $k-\varepsilon$$\varepsilon$ turbulence model. The interphase friction and heat transfer coefficient were calculated from the correlations available in the literature. The turbulent dispersion of the phases was modeled by a "dispersion Prandtl number". In the case with heat transfer where the temperature of the injected gas is higher than the mean liquid temperature, the axial and the radial velocities are lower in comparison with the case of homogeneous temperatures. The results in the present research are of interest in the design and operation of a wide variety of material and chemical processes.
최청렬,김창녕 慶熙大學校 大學院 院友會 1999 高凰論集 Vol.24 No.-
Characteristics of two-phase flow and heat transfer were numerically investigated in gas injected reactors. Heat transfer characteristic and effects of heat transfer were investigated when temperature of the injected gas is different from that of the liquid. The Eulerian approach was used for the formulation of both the continuous and dispersed phases. The turbulence in the liquid phase was modeled by the use of the standard κ-ε turbulence model. The interphase friction and heat transfer coefficient were calculated by means of correlations available in the literature. The turbulent dispersion of the phases was modeled in introducing a "dispersion Prandtl number". The results in the present research are of interest in the design and operation of a wide variety of material and chemical processes.
Bubble Stirred Liquid Bath에서 이상유동 특성의 연구
최청렬,김창녕 慶熙大學校 大學院 院友會 1998 高凰論集 Vol.23 No.-
The flow fields in a bubble stirred liquid bath were numerically analyzed, In various gas flow rate and bubble size, the flow characteristics were predicted. Eulerian-Eulerian approach was used for the formulation of both the continuous and dispersed phases. The modification of the general purpose computer program PHOENICS code was employed to predict the mean flow fields, turbulent characteristics, gas dispersion, volume fraction. The predicted flow fields were compared with experimental measurements. Quantitatively it shows very satisfactory agreement with experimental results for all regions of ladle. The results are of interest in the design and operation of wide variety of material processing.