Abstract
Viruses, bacteria, and toxins are some of the biological warfare agents (BWAs) used in military operations that can cause fatalities by spreading diseases in ecosystems and spreading to even humans. BWAs are initially difficult to detect and require considerable amount of treatment time because BWAs are self-breeding, easily spread, and have latent periods, preventing the immediate onset of symptoms. Because BWAs exist in an aerosol form, many studies have been conducted to investigate biological weapons. In this study, the shape of the sheath flow nozzle was optimized to improve the focusing efficiency of the aerosol particles. ANSYS CFX ver. 18.1 was used for conducting the numerical analysis. The design parameters for optimization included the injection angle of the external and internal nozzles. The experimental results were obtained using the design of experiment to minimize the analysis time and obtain maximum information. Based on the results, the optimum shape was determined using the response surface method (RSM). The results were compared by CFD with the RSM results. The relative error was 0.14%; thus, the validity of the proposed method was confirmed. The results of the reference model and optimal shape were compared, and the relative error was 3.36%.
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