Experimental investigation of interfacial waves in stratified liquid-liquid flows in horizontal pipelines: Characteristics and pressure gradients

2019 ◽  
Vol 173 ◽  
pp. 20-36 ◽  
Author(s):  
V.K. Premanadhan ◽  
V. Hernandez-Perez ◽  
Wan Thiam Teik ◽  
Nguyen Dinh Tam ◽  
Ove Bratland ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Pressure Gradients ◽  
Interfacial Waves ◽  
Liquid Flows ◽  
Stratified Liquid

scholarly journals Vortex-induced interfacial waves in liquid–liquid flows across cylindrical bluff bodies of various sizes

2019 ◽  
Vol 76 ◽  
pp. 340-351
Author(s):  
Mohd Izzudin Izzat Zainal Abidin ◽  
Kyeong Hyeon Park ◽  
Panagiota Angeli
Keyword(s):  
Bluff Bodies ◽  
Interfacial Waves ◽  
Liquid Flows

Film Cooling From Two Rows of Holes Inclined in the Streamwise and Spanwise Directions

1985 ◽  
Vol 107 (1) ◽  
pp. 84-91 ◽  
Author(s):  
B. Jubran ◽  
A. Brown
Keyword(s):  
Experimental Investigation ◽  
Film Cooling ◽  
Free Stream ◽  
Pressure Gradients ◽  
Cooling Effectiveness ◽  
Film Cooling Effectiveness ◽  
Typical Range

This paper describes the results of an experimental investigation into the film cooling effectiveness of two rows of holes inclined in the stream and spanwise directions. The effects of hole and row spacings and combinations of inclinations are investigated in the presence of free-stream pressure gradients and turbulence for a typical range of blowing rates.

scholarly journals The Chordwise Lean of Highly Loaded Turbine Blades

1996 ◽  
Author(s):  
Zhongqi Wang ◽  
Wanjin Han
Keyword(s):  
Experimental Data ◽  
Experimental Investigation ◽  
Saddle Point ◽  
Turbine Blades ◽  
Acute Angle ◽  
Secondary Vortex ◽  
Pressure Gradients ◽  
Turbine Cascades ◽  
Highly Loaded

An experimental investigation was carried out on the effect of blade chordwise lean on the losses in highly loaded rectangular turbine cascades. Detail measurements include 10 traverses from the upstream to the downstream of the cascades with five-hole spherical probes. Compared with the experimental data of the conventional straight and pitchwise lean blades under the same conditions, it is shown that the effect of chordwise lean on the development of the cascade losses is similar to that of pitchwise lean. However, the chordwise lean produces smaller streamwise adverse pressure gradients near both endwalls and a smaller spanwise negative one starting from the acute angle side in the first part of the passages in chordwise lean cascade, thereby the saddle point separations and intensities of the passage vortices are weakened and the secondary vortex losses are cut down notably.

Slug generation processes in co-current turbulent-gas/laminar-liquid flows in horizontal channels

2018 ◽  
Vol 860 ◽  
pp. 224-257 ◽  
Author(s):  
Sha Miao ◽  
Kelli Hendrickson ◽  
Yuming Liu
Keyword(s):  
Solitary Waves ◽  
Slug Flow ◽  
Flow Dynamics ◽  
Immersed Boundary ◽  
Initial Growth ◽  
Interfacial Waves ◽  
Two Phase ◽  
Interface Evolution ◽  
Resonant Wave ◽  
Liquid Flows

We theoretically and computationally investigate the physical processes of slug-flow development in concurrent two-phase turbulent-gas/laminar-liquid flows in horizontal channels. The objective is to understand the fundamental mechanisms governing the initial growth and subsequent nonlinear evolution of interfacial waves, starting from a smooth stratified flow of two fluids with disparity in density and viscosity and ultimately leading to the formation of intermittent slug flow. We numerically simulate the entire slug development by means of a fully coupled immersed flow (FCIF) solver that couples the two disparate flow dynamics through an immersed boundary (IB) method. From the analysis of spatial/temporal interface evolution, we find that slugs develop through three major cascading processes: (I) stratified-to-wavy transition; (II) development and coalescence of long solitary waves; and (III) rapid channel bridging leading to slugging. In Process I, relatively short interfacial waves form on the smooth interface, whose growth is governed by the Orr–Sommerfeld instability. In Process II, interfacial waves evolve into long solitary waves through multiple resonant and near-resonant wave–wave interactions. From instability analysis of periodic solitary waves, we show that these waves are unstable to their subharmonic disturbances and grow in amplitude and primary wavelength through wave coalescence. The interfacial forcing from the turbulent gas–laminar liquid interactions significantly precipitates the growth of instability of solitary waves and enhances coalescence of solitary waves. In Process III, we show by an asymptotic analysis that interfacial waves achieve multiple-exponential growth right before bridging the channel, consistent with observations in existing experiments. The present study provides important insights for effective modelling of slug-flow dynamics and the prediction of slug frequency and length, important for design and operation of (heavy-oil/gas) pipelines and production facilities.

Experimental Investigation of Intermittent Gas-Liquid Flows on Solid Particle Transportation in Inclined Pipelines

2011 ◽  
Author(s):  
Liang Wang ◽  
Afshin Goharzadeh ◽  
Peter Rodgers
Keyword(s):  
Experimental Investigation ◽  
Solid Particle ◽  
Liquid Flow ◽  
Transport Phenomena ◽  
Solid Particles ◽  
Bed Load ◽  
Internal Diameter ◽  
Flow Phenomenon ◽  
Liquid Flows ◽  
Pipe Inclination

Solid particle transport in pipelines by fluids is widely encountered in energy industry processes, such as oil production, drilling of horizontal and inclined wells and mining. In contrast to the intensive research effort that has investigated solid transport in horizontal pipelines, limited studies have been published on solid transportation mechanism generated from an initial stationary particle bed in inclined pipes. Consequently the underlying mechanisms responsible for pipe inclination influence on bed-load transport phenomena have not been extensively assessed, particularly for gas-liquid conveying of solid particles. This paper presents an experimental investigation on the influence hydraulic and two phase (gas-liquid) flows on sand dune transportation resulting from a stationary flat bed as a function of (i) pipe inclination, (ii) gas liquid flow rate and (iii) initial sand bed thickness. Experiments were undertaken in a laboratory environment using a 14 m long transparent Plexiglas loop of 24 mm internal diameter to permit optical access. The three phases used were water, air and sand. High speed digital photography was employed to study the flow phenomenon and characteristics of sand bed transportation for the analysis variables (i) to (iii) under consideration. For hydraulic conveying of solid particles, it was found that 1° upward pipe inclination had negligible influence on both the flow phenomenon and solid-liquid flow pattern transition. In contrast, for gas-liquid conveying of solid particles, pipe inclination resulted in considerably different transport phenomena relative to that observed for the horizontal orientation. Differences such as backward bed movement and enhanced particle suspension were observed, and found to be highly gas-liquid ratio dependent. These measurements provide fundamental insights into the influence of upward pipe inclination on bed-load mode solid transportation in a closed conduit.

Free and forced oscillation of a vertical tube containing a flowing fluid

1976 ◽  
Vol 284 (1316) ◽  
pp. 1-47 ◽  
Keyword(s):  
Experimental Study ◽  
Experimental Investigation ◽  
Special Reference ◽  
Forced Oscillation ◽  
Vertical Tube ◽  
Flowing Fluid ◽  
Liquid Flows ◽  
Instability Boundary

A flexible vertical tube, clamped at its upper end and carrying a nozzle at its free lower end, can become unstable when a liquid flows down it. The system is a convenient one for the study of passage through an instability boundary as it is amenable to theoretical and experimental investigation of both free and forced oscillation. This paper presents the results of a theoretical and experimental study of the motions with special reference to the instability boundary.

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