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Tuesday, August 11, 2020 | History

3 edition of A study of horizontal two-phase flow with chemical reaction in rifled tubes. found in the catalog.

A study of horizontal two-phase flow with chemical reaction in rifled tubes.

Gerald David Zarnett

A study of horizontal two-phase flow with chemical reaction in rifled tubes.

by Gerald David Zarnett

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Published in [Toronto] .
Written in English

    Subjects:
  • Chemical reactions,
  • Mass transfer,
  • Two-phase flow

  • Edition Notes

    ContributionsToronto, Ont. University.
    The Physical Object
    Paginationviii, 346 leaves.
    Number of Pages346
    ID Numbers
    Open LibraryOL18884758M

    Dukler, A. E. and Hubbard, M. G. () A model for gas-liquid slug flow in horizontal and near horizontal tubes, Industrial and Engineering Chemistry Fundamentals, 14, 2, Hall, A. R. W. () Multiphase Flow of Oil, Water and Gas in Horizontal Pipes, PhD Thesis, University of London. This work presents an analytical investigation of two-phase pressure drops during evaporation in horizontal tubes. Based on a comprehensive state-of-the-art review and comparison with two-phase frictional pressure drop prediction methods, it is proven that none of these existing methods were adequate to predict the experimental values presented in Part I. Hence, an analytical study was.

    Figure Flow regime map for the horizontal flow of an air/water mix-ture in a cm diameter pipe with flow regimes as defined in figure Hatched regions are observed regime boundaries, lines are theoretical pre-dictions. Adapted from Weisman (). In the oil industry, pipelines (circular ducts) are widely used for the transportation of oil and yours derived. Because of their advantages, such as low operating cost and increased safety during transportation, pipelines have become indispensable for transporting oil in large quantities and for long distances. As an alternative to this problem, the transport of oil and water can be.

      Two phase gas / liquid flow is important in a variety of chemical engineering applications such as the simultaneous transport of the gas and oil in horizontal pipelines or a vertical wells several.   Mishima K, Ishii M () Flow regime transition criteria for upward two-phase flow in vertical tubes. Int J Heat Mass Transf 27(5)– CrossRef Google Scholar Müller-Steinhagen H, Heck K () A simple friction pressure correlation for two-phase flow in pipes.


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A study of horizontal two-phase flow with chemical reaction in rifled tubes by Gerald David Zarnett Download PDF EPUB FB2

The authors conducted an experimental study of vapor‐liquid two‐phase flow instabilities in vertical parallel tubes for a high‐pressure vapor‐water loop. Two types of vertical parallel rifled tubes ( mm OD × 6 mm thickness, and mm × mm) were used as the tube by: 4.

The total pressure drop of saturated refrigerants comes from the variation of kinetic energy, potential energy, and the friction of the two-phase flow on the wall.

In horizontal tubes, the potential energy can be neglected, thus, the total pressure drop is the sum of the momentum pressure drop and the frictional pressure by:   Many flow pattern maps are available for predicting adiabatic two-phase flow regimes in horizontal tubes, such as Baker,Taitel and Dukler,Hashizume,Steiner, Most of them were developed for adiabatic conditions and then extrapolated to diabatic flow, so the extrapolation procedure may not always produce reliable by: The pressure drop characteristics of steam-water two-phase flow at a low mass velocity in a four-head rifled tube were experimentally studied under an adiabatic condition with pressure ranging from.

Amir Faghri, Yuwen Zhang, in Transport Phenomena in Multiphase Systems, Two-Phase Flow. Two-phase flow refers to the interactive flow of two distinct phases with common interfaces in a channel, with each phase representing a mass or volume of matter.

The two phases can exist as combinations of solid, gas and/or liquid phases. Although multiphase flow involving three phases can. Two-phase Fluid Flow. By definition, multiphase flow is the interactive flow of two or more distinct phases with common interfaces in, say, a conduit. Each phase, representing a volume fraction (or mass fraction) of solid, liquid or gaseous matter, has its own properties, velocity, and temperature.

A multiphase flow can be simultaneous flow of. Horizontal Pipe Flow Values given by manufacturer, or in the “Red Book” If flow is choked (critical) use: d,gas If flow is not choked (sub -critical) use: d,liquid K K d K.

TWO-PHASE DENSITY Where is the volume fraction of gas: Two-Phase Flow is much more complex. Flow regimes determine the macroscopic behavior of two phase flow.

Different regimes are classified by visual observation. It can be difficult to specify with certainty, which regime a particular flow belongs to. Many different classifications exist in the literature. Scientists. It follows from the experiments that in the case of a two-phase flow of the used mediums, the friction-related pressure losses in tubes with internal helical ribs range from – times higher compared to those arising in smooth tubes.

This is an effect of the disturbance caused by the ribs in the flow. In the present work, a numerical model is developed to analyze the riser-downcomer system of a natural circulation steam generator. The design and operation of the riser-downcomer.

Yu, M.H.; Lin, T.K.; Tseng, C.C. Heat transfer and flow pattern during two-phase flow boiling of Ra in horizontal smooth and microfin tubes.

Int. Refrig. 25, – [Google Scholar] Spindler, K.; Müller-Steinhagen, H. Flow boiling heat transfer of Ra and RA in a microfin tube at low mass fluxes and low heat fluxes.

horizontal flow, in addition to the above flow regimes, there can also be stratified flow, typical of low flow rates at which the two phases separate under the effect of gravity.

Table 1. Qualitative classification of two‐phase flow regimes. Flow quality Flow rate Flow regime Low Low and intermediate Bubbly High Dispersed bubbly. Rifled tube which is one of the rough surface tube has been getting attention from researchers due to its ability to enhance the heat transfer.

Previous researches on rifled tube has been done through experimental work. Therefore, numerical analysis by using commercial Computational Fluid Dynamics (CFD), Fluent® has been carried out to investigate the flow characteristic of the single.

@article{osti_, title = {Study of pressure drop, void fraction and relative permeabilities of two phase flow through porous media}, author = {Chu, W and Dhir, V K and Marshall, J}, abstractNote = {An experimental investigation of two phase flow through porous layers formed of non-heated glass particles (nominal diameter 1 to 6 mm) has been made.

This study experimentally investigated two-phase flow pressure drop of propane as refrigerant in horizontal small tube. Inner diameter and length of the tube were mm and m, respectively.

In order to get pressure drop data, the experiment was conducted in various conditions of 10 to 25 kW m-2 heat flux, to kg m-2 s-1 mass flux, and to °C saturation temperature. Models to predict two-phase flow in fractures are therefore of practical interest, but little is known of the laws governing such flow.

The approach most commonly taken to model two-phase flow in a single fracture is to treat the fracture as a 2- dimensional porous medium, and write Darcy's law for each phase. For horizontal flow. The goal of the research reported here is to develop methods whereby pressure drop, void fraction, and flow pattern for horizontal two-phase flow of gases and non-Newtonian liquids can be predicted simply from knowledge of fluid properties, flow rates, and pipe size.

The pressure drop characteristics of steam-water two-phase flow at a low mass velocity in a four-head rifled tube were experimentally studied under an adiabatic condition with pressure ranging.

This work focusses on the modeling of two-phase flows in horizontal, constant-cross­ section tubes by a two-fluid approach. The objectives are to develope a framework for two-fluid modeling, to highlight issues related to two-phase phenomena and to implement the model on a computer.

Cambridge Core - Thermal-Fluids Engineering - Two-Phase Flow, Boiling, and Condensation - by S. Mostafa Ghiaasiaan. Experimental and analytical study of two-phase pressure drops during evaporation in horizontal tubes Moreno Quibén, Jesús ; Thome, John Richard Two-phase flow of gases and liquids or vapors and liquids in pipes, channels, equipment, etc.

is frequently encountered in industry and has been studied intensively for many years. Fukano, T., Sakamoto, T., Tominaga, A., and Katoh, E.,“Experimental study on the flow mechanism of a thin liquid film flowing concurrently with a high speed gas flow in a horizontal rectangular duct,” Proceedings of the ASME-JSME Thermal Engineering Joint .Flow Patterns – Two-phase Flow.

One of the most challenging aspects of dealing with two-phase flow or multi-phase flow is the fact that it can take many different forms. Spatial distributions and velocities of the liquid and vapor phases in the flow channel is very important aspect in many engineering re drops and also heat transfer coefficients strongly depends on the local.