Publications
224 results found
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
Wong WL, Hale CP, Hewitt GF, et al., 2004, Three-phase flows in complex geometries, 4th North American Conference on Multiphase Technology, Pages: 251-269
Slug evolution is a process made more complex by the presence of large amplitude waves, the variation of the liquid depth ahead of the slug, and the entrainment of the gas phase into the slug body. Experiments "tracking" the evolution of slugs in three phase air-water-oil flows have been conducted for both horizontal and "V"-section pipe configurations on the WASP facility at Imperial College London. The oil was Shell Tellus 22 (ρoil=865 kgm-3 @ 15°C, μoil=0.04 Pas @ 20°C, σoil=0.032 Nm @ 25°C). Measurements were obtained for several liquid and gas superficial velocities over a range of water cuts. Details of the interfacial development, slug frequency and average liquid holdup were obtained at 7 axial locations using gamma densitometers. Tomographic images illustrating the transverse distribution of the phases within the liquid slug were constructed by conditional sampling of the output from a traversing beam gamma densitometer.
Sun G, Hewitt GF, Wadekar VV, 2004, A heat transfer model for slug flow in a horizontal tube, INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, Vol: 47, Pages: 2807-2816, ISSN: 0017-9310
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- Citations: 8
Ng TS, Lawrence CJ, Hewittt GF, 2004, Friction factors in stratified two-phase flows, CHEMICAL ENGINEERING RESEARCH & DESIGN, Vol: 82, Pages: 309-320, ISSN: 0263-8762
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- Citations: 10
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
Su J, Hewitt GF, 2004, Inverse heat conduction problem of estimating time-varying heat transfer coefficient, NUMERICAL HEAT TRANSFER PART A-APPLICATIONS, Vol: 45, Pages: 777-789, ISSN: 1040-7782
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- Citations: 68
Hewitt GF, 2003, Workshop on Scientific Issues in Multiphase Flow Summary of contributions, Multiphase Science and Technology, Vol: 15, Pages: 1-19, ISSN: 0276-1459
This Summary introduces and discusses papers presented in this issue of Multiphase Science and Technology which had their origin at the Workshop on Scientific Issues in Multiphase Flow held at the University of Illinois in May 2002. The areas covered were: Flow Regimes in Multi-fluid Flow, Disperse Flow, Computational Physics and Micro Physics.
Hewitt GF, 2003, Flow regimes: Transitions and flow behaviour, Multiphase Science and Technology, Vol: 15, Pages: 131-143, ISSN: 0276-1459
The limitations of current methods for predicting flow patterns are discussed and a plea is made for two specific flow patterns (namely churn flow and wispy annular flow) to be recognised and more widely studied. Issues arising in annular, slug, stratified and bubbly flows are reviewed.
Hewitt GF, 2003, Prediction of multiphase flows: A personal view, Multiphase Science and Technology, Vol: 15, Pages: 289-292, ISSN: 0276-1459
A short overview is given of the historical development and future prospects for predicting multiphase systems. This starts with a discussion of empirical correlations and goes on to review the roles of phenomenological models, multifluid models and direct numerical simulation (DNS).
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
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- Citations: 24
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
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- Citations: 6
Yeo LY, Matar OK, de Ortiz ESP, et al., 2003, Film drainage between two surfactant-coated drops colliding at constant approach velocity, JOURNAL OF COLLOID AND INTERFACE SCIENCE, Vol: 257, Pages: 93-107, ISSN: 0021-9797
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- Citations: 75
Falcone G, Hewitt GF, Lao L, et al., 2003, Anumet: A Novel Wet Gas Flowmeter, Proceedings - SPE Annual Technical Conference and Exhibition, Pages: 4001-4012
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
Bonizzi M, Issa RI, Hewitt GF, et al., 2003, Studies of three phase oil-water-gas flow in pipelines, Cranfield, 11th international conference on multiphase; extending the boundaries of flow assurance, San Remo, Italy, Publisher: BHR Group, Pages: 407-426
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
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
Yeo LY, Matar OK, Perez de Ortiz ES, et al., 2002, A description of phase inversion behaviour in agitated liquid-liquid dispersions under the influence of the Marangoni effect, CHEMICAL ENGINEERING SCIENCE, Vol: 57, Pages: 3505-3520, ISSN: 0009-2509
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- Citations: 16
Barbosa JR, Hewitt GF, König 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
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- Citations: 67
Barbosa JR, Kandlbinder T, Hewitt GF, 2002, Forced convective boiling of ternary mixtures at high qualities, INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, Vol: 45, Pages: 2655-2665, ISSN: 0017-9310
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- Citations: 14
Ng TS, Lawrence CJ, Hewitt GF, 2002, Laminar stratified pipe flow, INTERNATIONAL JOURNAL OF MULTIPHASE FLOW, Vol: 28, Pages: 963-996, ISSN: 0301-9322
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- Citations: 28
Yeo LY, Matar OK, de Ortiz ESP, et al., 2002, Simulation studies of phase inversion in agitated vessels using a Monte Carlo technique, JOURNAL OF COLLOID AND INTERFACE SCIENCE, Vol: 248, Pages: 443-454, ISSN: 0021-9797
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- Citations: 15
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
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- Citations: 1
Falcone G, Hewitt GF, Alimonti C, et al., 2002, Multiphase flow metering: Current trends and future developments, 2001 SPE Annual Technical Conference and Exhibition, Publisher: SOC PETROLEUM ENG, Pages: 77-84, ISSN: 0149-2136
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- Citations: 56
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
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- Citations: 12
Yeo LY, Matar OK, de Ortiz ESP, et al., 2002, A simple predictive tool for modelling phase inversion in liquid-liquid dispersions, CHEMICAL ENGINEERING SCIENCE, Vol: 57, Pages: 1069-1072, ISSN: 0009-2509
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- Citations: 34
Soleimani A, Lawrence CJ, Hewitt GF, 2002, The decay of swirl in horizontal dispersed oil-water flow, CHEMICAL ENGINEERING RESEARCH & DESIGN, Vol: 80, Pages: 145-154, ISSN: 0263-8762
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- Citations: 3
Lau L, Mendes MA, Hewitt GF, 2002, Pressure gradient prediction in vertical counter-current flows, Multiphase Science & Technology, Vol: 14, Pages: 95-107, ISSN: 0276-1459
Hewitt GF, 2002, Heat exchanger design handbook 2002 (HEDH 2002), York, Publisher: Begell House, ISBN: 9781567001822
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