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Wednesday, May 20, 2020 | History

2 edition of Hot film anemometry in dispersed oil-water flows. found in the catalog.

Hot film anemometry in dispersed oil-water flows.

Brian Farrar

Hot film anemometry in dispersed oil-water flows.

by Brian Farrar

  • 223 Want to read
  • 9 Currently reading

Published in Bradford .
Written in English


Edition Notes

Ph.D. thesis. Typescript.

SeriesTheses
The Physical Object
PaginationIn 2 vols
ID Numbers
Open LibraryOL13861499M

Abstract. The objective of this chapter is to provide a comprehensive statement of the experimental methods that can be used to transduce the velocity and its companion quantity: vorticity (∇ × u ¯ Open image in new window).Velocity measurements can be understood to represent spatially integrated and pointwise values. Thermal transient anemometry (Sect. ) and sonic anemometers (Sect. 5. Experimental study of dispersed oil-water flow in a horizontal pipe with enhanced inlet mixing, Part 2: In-situ droplet measurements.

This paper is devoted to the study of the turbulence in the liquid phase of a vertical, co-current air-water bubbly flow. The air bubbles are blown uniformly into a hydrodynamic tunnel, through a grid which generates a quasi-isotropic turbulent field. The turbulent characteristics have been obtained by hot-film and Laser Doppler Anemometry. In this work, an experimental and numerical study of the fully dispersed flow regime of an oil/water mixture (liquid paraffin and water) in a horizontal pipe, with concentrations of the oil of , , and v/v were developed.

In this study, new experimental results are presented on the pipeline flow behavior of water-in-oil (W/O) emulsions, with and without the presence of polymeric additive in the aqueous phase. Research focusing on the flow and transport phenomena in complex two-phase systems. About. We study the flow and intensified processing of complex multiphase are interested, in particular, in immiscible liquid-liquid mixtures, as well as particle or bubble suspensions in non-Newtonian fluids for energy and manufacturing applications. The aim of the research is to gain fundamental.


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Hot film anemometry in dispersed oil-water flows by Brian Farrar Download PDF EPUB FB2

Hot-film anemometry in air-water flow. Article tifii d Iiroplct s i n a Ca s Flow. Hot-wir e inc-more- th e signa) wit h high-spee d movie s conclude d tha t hot. Hot-film anemometry in dispersed oil-water flows: Development of a hot-film anemometer based measurement technique for detailed studies of complex two-phase flows and its water-kerosene and water-air flows.

In contrast, very few researchers have tried to use hot film probes for two-phase liquid/liquid and three-phase gas/liquid/liquid measurements; in particular, for the oil/water/gas flows which are of interest in the petroleum recovery industry.

This paper presents measurements of three-phase air/oil/water flows using a hotfilm : Stephen D. Mayo, Richard T. Lahey. Hot-film anemometry in dispersed oil-water flows Development of a hot-film anemometer based measurement technique for detailed studies of complex two-phase flows and its water-kerosene and water-air flowsAuthor: B Farrar.

Hot-film anemometry measurements are performed in a fully developed turbulent bubbly flow. For the bubble detection in the signal, both a threshold method and a new pattern recognition algorithm.

fluctuation in time domain in turbulent flows. There are two types of probe (1) hot wire and (2) hot film. HOT WIRE SENSORS Figure shows tungsten hot wire anemometer probe. The typical diameter of probes ranges from to mm and length from to mm. The most commonly used wire. The use of a hot-wire anemometer for high-resolution turbulence measurements in a two-phase flow (e.g., atmospheric clouds) is discussed.

Experiments in a small wind tunnel (diameter of and 2 m in length) with a mean flow velocity in the range between 5 and 16 m s −1 are performed. In the wind tunnel a spray with a liquid water content of and g m −3 is generated. New data for dispersed flow film boiling of nitrogen are presented for the following conditions: tube diameter, and in.

ID; length 4 and 8 ft; mass veloc to 19, lb/hr ft 2; heat flux 0 to Btu/hr ft 2; inlet condition near saturation; exit quality 35 to previously presented analysis [12] is improved by accounting for droplet breakup due to.

Bruun H H, Samways A L and Ali J (), A hot-film study of oil/water flow in vertical pipes. Proc. 2nd Int. Conf. on Multiphase Flow (Kyoto, Japan, 3–7 April) paper P1, pp 61– Google Scholar.

Time averaged local profiles of the void fraction, mean liquid velocity and the liquid turbulence intensity were measured along the radial direction of horizontal pipe using hot-film anemometry. A cylindrical TSI W hot-film probe was used with a DISA 55M10 Constant Temperature Anemometer (CTA) bridge.

The hot-film is mounted on a traverse which allows measurements at different radial positions. Currently, the main techniques of flow pattern detection, such as the direct visual observation method, high-speed imaging, conductance probes, impedance probes, optical probes, and hot-film anemometry, have been widely used in multiphase flow studies.

But for highly viscous oils, the patterns of oil–water flows are quite difficult to be identified due to their dark color and high viscosity.

Farrar and Bruun () used the hot-film anemometry to investigate the structure of a vertical pipe flow of a kerosene–water mixture flow and obtained turbulence characteristics and dispersed phase sizes.

In principle, the hot-film anemometry method consists of the instantaneous measurement of the change in heat transfer from an electrically heated sensor. As the fluid flows past the constant temperature hot-film probe, changes in the fluid velocity, including turbulent fluctuations, cools the sensor at.

Dispersed oil-water two-phase flow in vertical pipe is numerically simulated using two-fluid modelling approach. A k-ε model is applied for turbulent structure of continuous fluid. Applications of hot-wire anemometry for two-phase flow measurements such as void fraction and slip velocity.

Bubbles, Drops and Particles. Academic press, (). Hot-film anemometry in dispersed oil-water flows. Two phase flow investigations have been undertaken for some time involving either liquid-gas or liquid-liquid flows. In spite of the growing interest in inclined (deviated) oil-water flows, only a small number of experimental data exist.

This thesis describes an experimental study into deviated oil-water flows using thermal anemometry and optical probes. This thesis describes an experimental study into deviated oil-water flows using thermal anemometry and optical probes.

Two novel measuring techniques have been designed and tested in a 78mm diameter multiphase flow ioop. The measuring devices are known as the dual probe and the dual split-film probe. Jana et al. () defined four kinds of vertical oil-water two phase flow patterns in a mm ID pipe, i.e., dispersed bubbly flow, bubbly flow, churn-turbulent flow and coreannular flow.

Phase inversion in a dispersed oil-water and oil-water-gas flow. PhD thesis Delft University of Technology, ISB horizontal annular dispersed gas/liquid flow International Journal of Multiphase F p.

Hot-film anemometry in bubbly flow: Bubble-probe interaction Int. Multiphase F Keywords: Dispersed oil-water pipe flow, image processing, denoising, spatial filtering, frequency filtering, contrast improvement.

INTRODUCTION Liquid-liquid flow is commonly encountered in the petroleum industry, where a number of applications involve oil-water flow such as crude oil production and transportation. Experiments were performed to measure the velocities of both phases in a monodispersed bubbly flow in a vertical column.

Using water and water-glycerin mixtures, measurements were obtained for a range of Reynolds numbers from 10 to For all cases, the Weber number was below 2. To generate a uniform stream of bubbles, an array of identical capillaries was used.This method generates bubbles between 1 and 2 mm in diameter.

To generate bubbles Kodak Photo-Flow, a common wetting agent, was added to the water in the experimental loop. This surfactant decreases the surface tension of the water, forming smaller bubbles between and 1 mm in diameter.The comparisons between the liquid flow rates measured by a magnetic flow meter and those obtained from the local LDA and multi-sensor conductivity probe measurements showed good agreement.

In addition, based on the local measurements the distribution parameter and the drift velocity in the drift-flux model were obtained for the current.