Results 231 to 240 of about 44,317 (262)

Air water flows in building drainage systems

Urban Water Journal, 2013
This paper investigates the mechanisms of two-phase flows that occur in commercial and industrial roof drainage systems. Both traditional gravity-fed and siphonic roof drainage systems are examined.Air entrainment plays a fundamental role in the performance of siphonic roof drainage systems.
Beecham, Simon, Lucke, T
openaire   +2 more sources

Air-Water Flow Structure in a Circular Dropshaft

World Environmental and Water Resources Congress 2013, 2013
Circular dropshafts, commonly used in urban storm water systems for energy dissipation and flow control, are characterized by significant flow aeration. In the laboratory, a series of experiments were performed in a circular dropshaft having two identical horizontal inflow and outflow circular channels having diameters of d=0.12 m, and a circular drop ...
S. Y. Kumcu, M. A. Kokpinar
openaire   +1 more source

LDA measurement in air–water downward flow

Experimental Thermal and Fluid Science, 2004
Abstract Local characteristics of the liquid phase in air–water downward flow were investigated in a 50.8 mm inner-diameter round pipe. A laser Doppler anemometry (LDA) system was used to measure axial liquid velocity and its fluctuations. To reduce the measurement uncertainty, the experiments were performed in flow conditions with low void fraction.
Xiaodong Sun, Sidharth Paranjape, Mamoru Ishii, Jennifer Uhle   +3 more
openaire   +1 more source

Air-Water Flow in Coarse Granular Media

Journal of the Hydraulics Division, 1978
Air may be entrained in the flow in porous shore structure under wave action. Three conceptual models for two-phase flow in ducts have been adapted to describe flow in coarse granular media. These are the homogeneous, bubbly drift-flux, and slug drift-flux models.
Alim A. Hannoura, John A. McCorquodale
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Air-water bubbly flow in free-shear layers [PDF]

, 1996
Air-water bubbly flows are encountered in many engineering applications ranging from chemical engineering to mechanical engineering applications (e.g. WOOD 1991, CHANSON 1995). In some cases, free-surface aeration is maximised (e.g. for re-oxygenation). In others, it must be minimised or prevented (e.g.
Chanson, H., Brattberg, T.
openaire   +1 more source

Air-water flows in circular drop manholes

Urban Water Journal, 2014
Drop manholes, a typical element of urban drainage networks in steep catchments and in reaches of supercritical flow, enhance air entrainment and entrapment. The air flow across drop shafts can be remarkably high.This paper discusses the air transport phenomena and the effects of ventilation absence in drop manholes.
GRANATA, Francesco, DE MARINIS, Giovanni, GARGANO, Rudy   +2 more
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Formation of an air‐water two‐phase flow

AIChE Journal, 1977
AbstractThe geometrical parameters of injection devices are shown to have almost no effect on the resulting two‐phase flow, while they influence the pressure drop owing to its formation. The predominant hydrodynamic parameter is the ratio of the mean superficial velocities. A simplified analysis leads to good agreement with experimental results.
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The horizontal pipeline flow of air‐water mixtures

The Canadian Journal of Chemical Engineering, 1962
AbstractA review and comparison of the various methods which have been proposed for the correlation of the pressure drop attending the flow of gas‐liquid mixtures is made. The friction factor and other terms employed in the correlations are related mathematically.The horizontal flow of air‐water mixtures has been investigated in a 41 ft.
G. W. Govier, M. M. Omer
openaire   +1 more source

Experimental Investigations of Internal Air-water Flows

2015
The objective of the present thesis research is to apply state-of-the-art experimental and data analysis techniques to the study of gas-liquid pipe flows, with a focus on conditions occurring in header-feeder systems of nuclear reactors under different accident scenarios.
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Air-Water Flow Structures at an Abrupt Drop with Supercritical Flow

1998
In storm waterways, at reservoir outlets and in water treatment plants, it is common to design drops, stepped waterways and cascades because of their energy dissipation and flow aeration characteristics. At an abrupt drop, the supercritical flow is characterised by a free-falling nappe impacting on the downstream invert (fig. 1).
Chanson, H., Toombes, L.
openaire   +1 more source