The transmission of SARS-CoV-2 through contact with contaminated surfaces or objects is an important form of transmissibility. Thus, in this study, we evaluated the performance of a disinfection chamber designed for instantaneous dispersion of the biocidal agent solution, in order to characterize a new device that can be used to protect individuals by reducing the transmissibility of the disease through contaminated surfaces. We proposed the necessary adjustments in the configuration to improve the dispersion on surfaces and the effectiveness of the developed equipment. Computational Fluid Dynamics (CFD) simulations of the present technology with a chamber having six nebulizer nozzles were performed and validated through qualitative and quantitative comparisons, and experimental tests were conducted using the method Water-Sensitive Paper (WSP), with an exposure to the biocidal agent for 10 and 30 s. After evaluation, a new passage procedure for the chamber with six nozzles and a new configuration of the disinfection chamber were proposed. In the chamber with six nozzles, a deficiency was identified in its central region, where the suspended droplet concentration was close to zero. However, with the new passage procedure, there was a significant increase in wettability of the surface. With the proposition of the chamber with 12 nozzles, the suspended droplet concentration in different regions increased, with an average increase of 266%. The experimental results of the new configuration proved that there was an increase in wettability at all times of exposure, and it was more significant for an exposure of 30 s. Additionally, even in different passage procedures, there were no significant differences in the results for an exposure of 10 s, thereby showing the effectiveness of the new configuration or improved spraying and wettability by the biocidal agent, as well as in minimizing the impact caused by human factor in the performance of the disinfection technology.

Brazil, according to regulatory bodies in the country, has 1,584,402 km of highway, far superior numbers to 30,129 kilometers of rail tracks and 20,956 km of waterways used economically. Given the importance of road transport modal for the country, minimization of the need for inputs into its operations has significant impacts. Between inputs necessary for the operation of this mode of transport fuel, due to the increasing cost and significant environmental impact it causes, it is a frequent target of interest. This paper analyzes by computational fluid dynamics the impact of vehicle air deflectors in aerodynamic drag and computes, through analytical method, the impact of drag reductions in fuel consumption. Simulations using the three-dimensional turbulence model SST k-ω result i 36% redu tio i aerodynamic drag which causes reductions in consumption that depends on the total load of the vehicle, varying between 33% and 35% for total loads between 10 and 20 tones.Keywords: CFD; Fuel Consumption; Vehicle Aerodynamics. ResumoO Brasil, segundo órgãos regulatórios do país, possui 1.584.402 quilômetros de rodovia, números bem superiores aos 30.129 quilômetros de malha ferroviária ou 20.956 quilômetros de hidrovias utilizadas economicamente. Dada a relevância do modal de transporte rodoviário para o país, minimizações da necessidade de insumos em suas operações têm significativos impactos. Dos insumos necessários à operação deste modo de transporte o combustível, devido ao crescente custo e significativo impacto ambiental que ocasiona, é frequente alvo de interesse. O presente trabalho analisou através de fluidodinâmica computacional o impacto de defletores de ar veiculares no arrasto aerodinâmico e computou, através de método analítico, o impacto das reduções de arrasto no consumo de combustível. Simulações tridimensionais através do modelo de turbulência SST k-ω resultaram em redução de 36% no arrasto aerodinâmico que ocasionam reduções de consumo dependentes da carga total do veículo, variando entre 33% e 35% para cargas totais entre 10 e 20 toneladas.