74 results found
Macchietto S, Hewitt GF, Coletti F, et al., 2011, Fouling in Crude Oil Preheat Trains: A Systematic Solution to an Old Problem, HEAT TRANSFER ENGINEERING, Vol: 32, Pages: 197-215, ISSN: 0145-7632
Jamari S, Hale CP, Hewitt G, et al., 2008, Studies of the slug-annular regime transition in two-phase flow in horizontal pipes, Multiphase Science and Technology, Vol: 20, Pages: 1-24, ISSN: 0276-1459
This paper discusses an investigation of the slug-annular transition in two-phase (air-water and air-oil) flow in a 78 mm internal diameter horizontal tube. The experiments were conducted at pressures of approximately 0.1 and 0.3 MPa (abs). The air and liquid superficial velocities ranged between 5.0-24.0 m/s and 0.05-0.2 m/s, respectively. The transition was investigated using visual observation (aided by video photography), evaluation of pressure drop and average holdup data, studies of slug body holdup, and axial view photography. It was concluded that the slug-annular transition occurred when the slug body holdup fell to around 30%. Using a standard holdup correlation to predict this condition led to satisfactory predictions of the transition.
Issa RI, Barbeau S, Hale CP, et al., 2007, Measurement and prediction of slug characteristics in three-phase flows, 13th International Conference on Multiphase Production Technology, Pages: 153-169
This paper describes experimental and modelling studies of three-phase (oil-water-gas) flows in a 77.92mm diameter horizontal tube. Measurements were made of pressure gradient and of the spatial and temporal distribution of the contents of the respective phases. Phase content measurements were made using gamma- and X-ray systems capable of discriminating between the two liquid phases. Data were obtained for the time averaged liquid phase hold-ups and, by conditional sampling, the holdup in the bodies of the slugs. Data were also obtained on slug initiation and on the evolution of slug frequency along the (37m) channel. Slug evolution was found to be very different in water-continuous and oil-continuous systems. To predict the flows, the slug capturing methodology developed previously at Imperial College was extended to the prediction of gas entrainment in the liquid slugs. Here, the two-fluid model framework was retained for the three-phase flows by writing a single momentum equation for the combined liquid phases, taking account of the relative motion of the phases using a drift-flux model. Excellent agreement was obtained between the predictions and the experiments. © BHR Group 2007 Multiphase Production Technology 13.
Hale CP, Hewitt GF, Hu B, et al., 2007, Gammas and X-ray tomography of liquid-liquid and gas-liquid-liquid flows, Multiphase Science and Technology, Vol: 19, Pages: 241-267, ISSN: 0276-1459
This article describes work carried out at Imperial College, London, in which a variety of gamma and X-radiography techniques were applied to the study of flows with two liquid phases (i.e., liquid-liquid two-phase flows and liquid-liquid-gas three-phase flows). Using a series of single-beam, single-energy gamma densitometers, it was possible to obtain data on the evolution of slug velocity and frequency. Using a traversing-beam, dual-energy densitometer, it was possible to obtain tomographic data on average phase distribution and (by conditional sampling) the phase distribution in the slugs. Using a triple-beam, dual-energy gamma densitometer, it was possible to obtain transient phase distribution data in the cross section, though at limited locations. Finally, complete cross-sectional distributions of the phases were obtained using a multibeam X-ray system, again in a form suitable for interpretation using a tomographic algorithm.
Richardson SM, Saville G, Fisher SA, et al., 2006, Experimental determination of two-phase flow rates of hydrocarbons through restrictions, PROCESS SAFETY AND ENVIRONMENTAL PROTECTION, Vol: 84, Pages: 40-53, ISSN: 0957-5820
Hale CP, Hewitt GF, Manolis IG, et al., 2005, Experimental and analytical studies of gas entrainment phenomena in slug flow in horizontal and near horizontal pipes, Multiphase Science & Technology, Vol: 17, Pages: 147-168, ISSN: 0276-1459
Saville G, Richardson SM, Barker P, 2004, Leakage in ethylene pipelines, PROCESS SAFETY AND ENVIRONMENTAL PROTECTION, Vol: 82, Pages: 61-68, ISSN: 0957-5820
Wong WL, Richardson SM, Hewitt GF, 2004, Analysis of phase distribution in two-phase air-water slug bodies (Paper 387), 5th international conference multiphase flow, Yokohama, 2004
Barbosa JR, Hewitt GF, Richardson SM, 2003, High-speed visualisation of nucleate boiling in vertical annular flow, INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, Vol: 46, Pages: 5153-5160, ISSN: 0017-9310
Barbosa JR, Hewitt GF, Richardson SM, 2003, A note on the influence of droplet interchange on evaporation and condensation of multicomponent mixtures in annular flow, INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, Vol: 46, Pages: 2505-2509, ISSN: 0017-9310
Wet gas metering is rapidly establishing itself as a special problem area within the more general area of multiphase flow metering. In fact, while attempts are being made across the Oil and Gas Industry to define the boundaries between humid gas, gas-condensate and high GVF (gas volume fraction) multiphase systems, a few commercial wet gas meters are already available for specific field applications. A major interest of Imperial College has been the development of metering schemes for three-phase (oil-gas-water) flows in oil-field production systems. Imperial College has already developed a flow meter (MIXMETER)1, which performs satisfactorily in the range of gas volume fractions of 0 to 90%. Imperial College has therefore been recently developing a new concept (ANUMET), which shows some promise for measuring two-phase flows at much higher gas volume fractions. The technical description of the ANUMET wet gas meter is outlined in this paper. Preliminary experiments on this new metering concept have been carried out with air-water flows in a 32 mm diameter tube in the LOTUS (LongTUbeSystem) facility at Imperial College. Encouraging results have been obtained and they are presented here.
Falcone G, Hewitt GF, Lao L, et al., 2003, ANUMET: a novel wet gas flowmeter (Paper SPE 84504), Proceedings of SPE annual technical conference, Denver, 2003
Choudhury TH, Duggan NK, Hu B, et al., 2003, Experimental studies of heat transfer in a tube bundle model (Paper TR2a), Proceedings of 8th UK national heat transfer conference, Oxford, 2003
Barbosa JR, Hewitt GF, Konig G, et al., 2002, Liquid entrainment, droplet concentration and pressure gradient at the onset of annular flow in a vertical pipe, INTERNATIONAL JOURNAL OF MULTIPHASE FLOW, Vol: 28, Pages: 943-961, ISSN: 0301-9322
Barbosa JR, Hewitt GF, Richardson SM, 2002, Improved annular flow modelling of pure fluids and multicomponent mixtures, 7th National Conference on Heat Transfer, Publisher: INST CHEMICAL ENGINEERS, Pages: 261-266, ISSN: 0263-8762
Barbosa JR, Hewitt GF, Richardson SM, 2002, Forced convective boiling of steam-water in a vertical annulus at high qualities, EXPERIMENTAL THERMAL AND FLUID SCIENCE, Vol: 26, Pages: 65-75, ISSN: 0894-1777
Richardson SM, Saville G, 2001, Results of Spadeadam experimental validation, Guidelines for the safe and optimum design of hydrocarbon pressure relief and blowdown systems, Editors: Hewitt, Hewitt, Hewitt, Publisher: Institute of Petroleum, ISBN: 9780852932872
Barbosa JR, Richardson SM, Hewitt GF, 2001, Churn flow: myth, mystery and magic, Proceedings of European two-phase flow group meeting, Aveiro, 2001
Richardson S, 1998, Untitled, PROCESS SAFETY AND ENVIRONMENTAL PROTECTION, Vol: 76, Pages: 203-203, ISSN: 0957-5820
Venables R, Richardson SM, Saville G, 1997, Heat transfer from a buried submarine pipeline, Symposium on 1997 Jubilee Research Event, Publisher: INST CHEMICAL ENGINEERS, Pages: 657-660
Saville G, deBristowe BS, Richardson SM, 1997, Safety in pressure testing, Symposium on Hazards XIII Process Safety - The Future, Publisher: INST CHEMICAL ENGINEERS, Pages: 437-450
Richardson SM, Saville G, 1996, Blowdown of LPG pipelines, PROCESS SAFETY AND ENVIRONMENTAL PROTECTION, Vol: 74, Pages: 235-244, ISSN: 0957-5820
Cloke VM, Higgins JS, Phoon CL, et al., 1996, Poiseuille geometry shear flow apparatus for small-angle scattering experiments, REVIEW OF SCIENTIFIC INSTRUMENTS, Vol: 67, Pages: 3158-3163, ISSN: 0034-6748
Richardson S, Saville G, 1996, Release the pressure, CHEMICAL ENGINEER-LONDON, Pages: 14-16, ISSN: 0302-0797
Fernandez ML, Higgins JS, Richardson SM, 1996, Polymer blend under shear flow: A thermodynamic study, International Conference on Advances in Materials and Processing Technologies (AMPT 93), Publisher: ELSEVIER SCIENCE SA LAUSANNE, Pages: 807-819, ISSN: 0924-0136
CHEN JR, RICHARDSON SM, SAVILLE G, 1995, MODELING OF 2-PHASE BLOWDOWN FROM PIPELINES .2. A SIMPLIFIED NUMERICAL-METHOD FOR MULTICOMPONENT MIXTURES, CHEMICAL ENGINEERING SCIENCE, Vol: 50, Pages: 2173-2187, ISSN: 0009-2509
SATO T, RICHARDSON SM, 1995, NUMERICAL-SIMULATION OF THE FOUNTAIN FLOW PROBLEM FOR VISCOELASTIC FLUIDS, POLYMER ENGINEERING AND SCIENCE, Vol: 35, Pages: 805-812, ISSN: 0032-3888
FERNANDEZ ML, HIGGINS JS, RICHARDSON SM, 1995, FLOW INSTABILITIES IN POLYMER BLENDS UNDER SHEAR, POLYMER, Vol: 36, Pages: 931-939, ISSN: 0032-3861
CHEN JR, RICHARDSON SM, SAVILLE G, 1995, MODELING OF 2-PHASE BLOWDOWN FROM PIPELINES .1. A HYPERBOLIC MODEL-BASED ON VARIATIONAL-PRINCIPLES, CHEMICAL ENGINEERING SCIENCE, Vol: 50, Pages: 695-713, ISSN: 0009-2509
RICHARDSON SM, 1995, Blowdown of pressurized vessels and pipelines, International Conference on Pressure Systems - Operation and Risk Management, Publisher: MECHANICAL ENGINEERING PUBL, Pages: 37-46, ISSN: 1356-1448
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