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Numerical model of a planar jet wiping system for continuous strip lines
Celia Miguel-González,Manuel García-Díaz,Bruno Pereiras,Miguel Vigil,Alejandro Rodríguez de Castro 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.7
The present study focuses on the numerical modelling of gas-jet wiping process. Many processes involving liquids are necessary during steel manufacturing, such as cooling, lubrication or cleaning. Satisfactory processes for removing the liquid are critical for the quality of the product obtained as well as for avoiding a product rejection in strip lines such as tandem mills and tinning lines. One the most widespread drying technology used is based on planar air-knives or nozzle rows which wipe the liquid out from the steel strip by creating an aerodynamic barrier. The objective of this paper is to analyze the performance of a simple air knife based on an inclined planar jet that is commonly used in many commercial or in-house built devices. A CFD model developed by using commercial software ANSYS FLUENT® was built in order to evaluate the wiping system depending on the type of feeding: central and lateral.
Complications and local relapse after intraoperative low-voltage X-ray radiotherapy in breast cancer
Ana Alicia Tejera Hernández,Víctor Manuel Vega Benítez,Juan Carlos Rocca Cardenas,Neith Ortega Pérez,Nieves Rodriguez Ibarria,Juan Carlos Díaz Chico,Juan José García-Granados Alayón,Pedro Pérez Correa 대한외과학회 2020 Annals of Surgical Treatment and Research(ASRT) Vol.98 No.6
Purpose: To study those factors that influence the occurrence of surgical complications and local relapse in patients intervened for breast cancer and receiving intraoperative radiotherapy. Methods: Observational study on patients intervened for breast cancer with conservative surgery and intraoperative radiotherapy with low-voltage X-ray energy source (INTRABEAM), from 2015 to 2017 with 24 months minimum followup. Variables possibly associated to the occurrence of postoperative complications were analyzed with the Student t-test and the Fisher exact test; P < 0.05 considered significant. Subsequently, the construction of multiple multivariate analysis models began, thus building a logistic regression analysis using the IBM SPSS Statistics ver. 23 software. Local relapse was described. Results: The study included 102 patients, mean age of 61.2 years; mean global size of tumor, 12.2 mm. Complications occurred in 29.4%. Fibrosis was the most frequently observed complication, followed by postoperative seroma. Using a 45 mm or larger applicator were significantly associated with the occurrence of complications. Tumor size 2 cm or larger and reintervention showed borderline significant association. Only one case of local relapse was observed. Conclusion: Certain factors may increase the risk of complication after the use of intraoperative radiotherapy. Using external complementary radiotherapy does not seem to increase the rate of complications. Select patients and the involvement of a multidisciplinary team are essential for achieving good results