Soybean grain pneumatic transport: experimental determination of the kinetic energy multiplier in a tee

Jordan Souza Higa, Maurício Andrade Nunes, Yago R. de Castro, Marlene S. de Moraes, Deovaldo de Moraes Jr

Abstract


The development of the pneumatic conveyor facilitated the displacement of solid materials, be-cause it provides a good security and low maintenance and installation costs. But since the transport is made through pipes, the pressure loss and the erosion wear of the pipes and bends are problems that can’t be avoided. Using tees can reduce this wear, but the pressure drop information for this fitting isn’t available on the literature. This work aimed the analysis of the pressure loss profile and the kinetic energy multiplier for a tee utilized on soybean pneumatic conveying for different process variables. The experimental unit consisted of a pilot scale pneumatic conveyer with 117 mm internal diameter acrylic ducts and piezometric taps in different points on the main pipeline. The curves for the head loss as a function of outlet speed were made for the air and 4 soybean flows (0.144, 0.201, 0.339 e 0.380 t/h). The K value found in the experiments varied between 0.141 and 0.248 for the soybean mass flows used. With only air on the system the range was 0.136 to 0.144. The K variation with the velocity can be predicted by the equation K= 0.0059∙v2-0.219∙v+2.1961  with a R2 of 0.9026.


Keywords: Pneumatic conveying, soybean, pressure loss, tee.


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