Numerical modelling of pipelines with air pockets and air valves
| Autor: | F. Javier Martínez-Solano, Gonzalo López-Patiño, P. Amparo López-Jiménez, Vicente S. Fuertes-Miquel |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
PIPE
Engineering INGENIERIA HIDRAULICA SEWERS 0208 environmental biotechnology Air valves ENTRAPPED AIR 02 engineering and technology Isothermal process TRANSIENT FLOW Pressurized flow SYSTEMS WATER Flows in pipes and nozzles MIXED FLOWS General Environmental Science Civil and Structural Engineering Mathematical models Petroleum engineering business.industry MECANICA DE FLUIDOS Environmental engineering 020801 environmental engineering Pipeline transport Transient flow Air pockets Water pipelines Transient (oscillation) business TRANSITION |
| Zdroj: | RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia instname |
| DOI: | 10.1139/cjce-2016-0209 |
| Popis: | This work considers the behaviour of air inside pipes when the air is expelled through air valves. Generally, the air shows isothermal behaviour. Nevertheless, when the transient is very fast, it shows adiabatic behaviour. In a real installation, an intermediate evolution between these two extreme conditions occurs. Thus, it is verified that the results vary significantly depending on the hypothesis adopted. To determine the pressure of the air pocket, the most unfavourable hypothesis (isothermal behaviour) is typically adopted. Nevertheless, from the perspective of the water hammer that takes place when the water column arrives at the air valve and abruptly closes, the most unfavourable hypothesis is the opposite (adiabatic behaviour). In this case, the residual velocity with which the water arrives at the air valve is higher, and, consequently, the water hammer generated is greater. |
| Databáze: | OpenAIRE |
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