Laser ultrasonic for Measurements of velocity distribution in pipes
The present work describes the development of a photoacoustic flowmeter with probe-beam deflection. A pulsedlaser beam produces an acoustic pulse, whose propagation is registered by its deflection effects on two cw probebeams. The acoustic pulse in a flowing fluid is produced by absorption of a lase...
| Autores: | , , , |
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| Tipo de documento: | artigo |
| Estado: | Versão publicada |
| Data de publicação: | 2004 |
| País: | México |
| Recursos: | Universidad Nacional Autónoma de México |
| Repositório: | Redalyc-UNAM |
| OAI Identifier: | oai:redalyc.org:47402306 |
| Acesso em linha: | https://www.redalyc.org/articulo.oa?id=47402306 |
| Access Level: | Acceso aberto |
| Palavra-chave: | Ingeniería Laser Velocimetry Turbulent pipe flow induced blast waves |
| Resumo: | The present work describes the development of a photoacoustic flowmeter with probe-beam deflection. A pulsedlaser beam produces an acoustic pulse, whose propagation is registered by its deflection effects on two cw probebeams. The acoustic pulse in a flowing fluid is produced by absorption of a laser pulse (30 ns, 1.1 mJ) focused overa path flow line. The acoustic propagations, along and against the flow, are monitored by two cw probe beams. Inthe interaction, the probe beam undergoes a transient deflection that is detected by a fast response photodiode.The velocity distribution data profile of a square pipe is obtained by means of the acoustic pulse arrival timemeasured through its cross section applying the cylindrical shockwave model developed by Vlasses. The profilesdetermined with this experimental technique are compared with two turbulent pipe flow models. |
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