Metodologia para determinação da perda de carga localizada em emissores não coaxiais integrados a tubos de polietileno / Methodology for Localized head loss determination of non coaxial emitters inserted in polyethylene pipe

AUTOR(ES)
DATA DE PUBLICAÇÃO

2008

RESUMO

The design of a lateral line of trickle irrigation requires an accurate evaluation of head losses in not only the pipe but the emitters as well. A procedure was developed to determine localized head losses within the emitters by the formulation of a mathematical model accounting for the obstruction caused by the insertion point. These localized losses can be significant when compared with the total head losses within the system, due to the large number of emitters typically installed along the lateral line. An experiment was carried out by altering flow characteristics to create Reynolds Number (R) in the interval from 7480 to 32597 to provide turbulent flow and a maximum velocity of 2.0 m s-1. The geometry of the emitter point was determined by an optical projector and sensor. An equation was formulated that allows the localized head loss calculation using the geometric characteristics of the emitter (emitter length, obstruction index and the contraction coefficient). The obtained results for 4 used models, the model esteemed satisfactorily for 2 models, and was also verified that the model presents an acting classified as great, therefore, could be used to estimate localized head loss provoked by non coaxial emitters inserted in polyethylene pipe with similar geometry as the Uniram and Drip Net emitters.

ASSUNTO(S)

contraction coefficient head loss modelos matemáticos hydraulic radius. irrigação localizada perda de carga. emitter

ACESSO AO ARTIGO

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