Influencia do fator de atrito no calculo do transiente hidraulico

AUTOR(ES)

Marcelo da Silva Rocha

DATA DE PUBLICAÇÃO

1998

RESUMO

The hydraulic transients, as are called the pressure waves (positive or negative) generated into the pipes by component settings, can be large and occur with frequencies enough to cause rupture or collapse of the systems components as : pipes, valves, etc. Many contral devices, which themselves alter the flow velocity, and therefore case secondary transient events, respond to system pressure. Thus, relability of realistic simulation of system behavior depends on how accurately are the flow and pressure changes and the frequency of cydes predictions. A cause of this modeling error lies in the use of quasi-steady friction equation which is only valid for steady flows. This research will compare results obtained of two computing models and applying the elastic method to promote a systematic analysis of efficiency and accuracy made by friction equation uses, which incorporates rate dependent velocity, shear and compressibility effects within a single, generalized framework

ASSUNTO(S)

escoamento instavel (dinamica dos fluidos) mecanica dos fluidos engenharia hidraulica

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