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전단박화 효과를 고려한 R2R 공정에서의 잉크전달 과정에 관한 FSI 해석
김경훈(Kyunghun Kim),남태원(Taewon Nam),김소희(Sohee Kim),나양(Yang Na) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
In most of the earlier numerical studies for the practical R2R printing system, the conductive ink was used to be idealized by a Newtonian fluid. Considering the fact that the real conductive ink can be better described by a non-Newtonian fluid with a shear thinning effect, FSI analysis was conducted to investigate the effect of variable viscosity using a CFD technique for the R2R printing process. Numerical results showed that non-Newtonian model representing a shear thinning effect tend to produce relatively lower printing quality than that of the Newtonian model in terms of amount of transferred ink. Also, it was found that non-negligible web deflection occurs in all the geometries considered in the present work but the ratio of the web deflection gets smaller as the web handling speed becomes higher, indicating that the problems associated with the higher web handling speed may be more alleviated in the range of tens of microns than in the range of a couple hundred microns.
김소희(Sohee Kim),김경훈(Kyunghun Kim),남태원(Taewon Nam),나양(Yang Na) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
Two surgical procedures have been proposed and adopted by ENT doctors to treat the chronic maxillary sinusitis. These are known as IMA and MMA. Although earlier studies claimed that the MMA is more effective than the IMA, the controversy about the effectiveness of the MMA still continues. In present work, patho-physiological characteristics of the airflow in the surgical models with different degrees were investigated through the CFD technique. It turned out that the most important physiological variable, flow rate, did not show any noticeable change after the sinus surgery even though the streamline patterns in the maxillary cavity and olfactory region were observed to be modified. Thus, it is expected that more relevant physiological parameter other than velocity and pressure itself may exist in the nasal surgery. Several derived flow-related quantities are detected and correlated to the surgically modified nasal cavities in the hope of identifying a prime physiological variable.