MEDIÇÃO DO CAMPO INSTANTÂNEO DE VELOCIDADE DO LÍQUIDO NO ESCOAMENTO BIFÁSICO INTERMITENTE EM TUBOS HORIZONTAIS E INCLINADOS / INSTANTANEOUS LIQUID VELOCITY FIELD MEASUREMENTS IN TWO-PHASE INTERMITTENT FLOW THROUGH HORIZONTAL AND INCLINED PIPES

AUTOR(ES)
DATA DE PUBLICAÇÃO

2009

RESUMO

instantaneous liquid velocity fields at the film, nose and tail regions of slugs in horizontal and inclined two phase flow. To this end, a combination of three nonintrusive optical techniques was employed. Two-dimensional particle image velocimetry (PIV) was used to measure the instantaneous liquid velocity field at a meridional plane of the horizontal pipe test section, while a synchronized pulsed back lighting, provided by a matrix of red LED s, illuminated the bubble contours thereby enhancing contrast of the interfaces (Pulsed Shadow Technique - PST). A laser-induced fluorescence technique (LIF) was employed to separate the strong reflections coming from the gas-liquid interfaces produced by the green PIV laser, The tests were conducted on a specially built transparent pipe test section, using air and water as the working fluids. The velocity fields were obtained for flow regimes where the slugs were lightly aerated. The velocity field results in the nose, tail and film regions revealed valuable detailed information that helped to better understand the physics of the flow, besides contributing to the formation of a data bank for supporting the development of two-phase, horizontal slug flow simulations. The work conducted also provided statistical information on the main global variables that characterize the flow, such as, speed and length of gas bubbles and liquid slugs, and the frequency of passage of these structures.

ASSUNTO(S)

statistics analysis campo particle image velocimetry yield velocimetria por imagens de particulas two-phase flow escoamento bifasico escoamento analise estatistica analytic field

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