Publications
185 results found
Blamey J, Paterson NPM, Dugwell DR, et al., 2010, Mechanism of Particle Breakage during Reactivation of CaO-based Sorbents for CO2 capture, Energy and Fuels (accepted)
Kumar P, Fennell P, Robins A, 2010, Comparison of the behaviour of manufactured and other airborne nanoparticles and the consequences for prioritising research and regulation activities, JOURNAL OF NANOPARTICLE RESEARCH, Vol: 12, Pages: 1523-1530, ISSN: 1388-0764
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- Citations: 48
George A, Larrion M, Dugwell D, et al., 2010, Co-firing of Single, Binary, and Ternary Fuel Blends: Comparing Synergies within Trace Element Partitioning Arrived at by Thermodynamic Equilibrium Modeling and Experimental Measurements, ENERGY & FUELS, Vol: 24, Pages: 2918-2923, ISSN: 0887-0624
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- Citations: 14
Blamey J, Anthony EJ, Wang J, et al., 2010, The calcium looping cycle for large-scale CO<sub>2</sub> capture, PROGRESS IN ENERGY AND COMBUSTION SCIENCE, Vol: 36, Pages: 260-279, ISSN: 0360-1285
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- Citations: 783
Wu Y, Blamey J, Anthony EJ, et al., 2010, Morphological Changes of Limestone Sorbent Particles during Carbonation/Calcination Looping Cycles in a Thermogravimetric Analyzer (TGA) and Reactivation with Steam, Energy & Fuels, Vol: 24, Pages: 2768-2776, ISSN: 0887-0624
Manovic V, Charland J-P, Blamey J, et al., 2009, Influence of calcination conditions on carrying capacity of CaO-based sorbent in CO<sub>2</sub> looping cycles, FUEL, Vol: 88, Pages: 1893-1900, ISSN: 0016-2361
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- Citations: 156
Kumar P, Fennell PS, Hayhurst AN, et al., 2009, Street Versus Rooftop Level Concentrations of Fine Particles in a Cambridge Street Canyon, 6th International Conference on Urban Air Quality, Publisher: SPRINGER, Pages: 3-18, ISSN: 0006-8314
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- Citations: 43
Fennell PS, Dennis JS, Hayhurst AN, 2009, The order with respect to oxygen and the activation energy for the burning of an anthracitic char in O<sub>2</sub> in a fluidised bed, as measured using a rapid analyser for CO and CO<sub>2</sub>, PROCEEDINGS OF THE COMBUSTION INSTITUTE, Vol: 32, Pages: 2051-2058, ISSN: 1540-7489
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- Citations: 33
Kumar P, Fennell P, Symonds J, et al., 2008, Treatment of losses of ultrafine aerosol particles in long sampling tubes during ambient measurements, ATMOSPHERIC ENVIRONMENT, Vol: 42, Pages: 8819-8826, ISSN: 1352-2310
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- Citations: 75
Ives M, Mundy RC, Fennell PS, et al., 2008, Comparison of Different Natural Sorbents for Removing CO<sub>2</sub> from Combustion Gases, as Studied in a Bench-Scale Fluidized Bed, ENERGY & FUELS, Vol: 22, Pages: 3852-3857, ISSN: 0887-0624
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- Citations: 40
Kumar P, Fennell P, Britter R, 2008, Effect of wind direction and speed on the dispersion of nucleation and accumulation mode particles in an urban street canyon, SCIENCE OF THE TOTAL ENVIRONMENT, Vol: 402, Pages: 82-94, ISSN: 0048-9697
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- Citations: 107
Stevenson P, Fennell PS, Galvin KP, 2008, On the drift-flux analysis of flotation and foam fractionation processes, CANADIAN JOURNAL OF CHEMICAL ENGINEERING, Vol: 86, Pages: 635-642, ISSN: 0008-4034
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- Citations: 14
Gao L, Paterson N, Fennell P, et al., 2008, The zero emission carbon concept (ZECA): Extents of reaction with different coals in steam/hydrogen, tar formation and residual char reactivity, ENERGY & FUELS, Vol: 22, Pages: 2504-2511, ISSN: 0887-0624
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- Citations: 13
Kumar P, Fennell P, Langley D, et al., 2008, Pseudo-simultaneous measurements for the vertical variation of coarse, fine and ultrafine particles in an urban street canyon, ATMOSPHERIC ENVIRONMENT, Vol: 42, Pages: 4304-4319, ISSN: 1352-2310
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- Citations: 87
Kumar P, Fennell P, Britter R, 2008, Measurements of particles in the 5-1000 nm range close to road level in an urban street canyon, SCIENCE OF THE TOTAL ENVIRONMENT, Vol: 390, Pages: 437-447, ISSN: 0048-9697
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- Citations: 79
Fennell PS, Dennis JS, Hayhurst A, 2007, The sampling of nanoparticles of MgO formed when doping an oxygen-rich flame with magnesium: The measurement of the concentrations and size-distributions of these nanoparticles, COMBUSTION AND FLAME, Vol: 151, Pages: 560-572, ISSN: 0010-2180
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- Citations: 9
Mueller CR, Davidson JF, Dennis JS, et al., 2007, Oscillations in gas-fluidized beds:: Ultra-fast magnetic resonance imaging and pressure sensor measurements, POWDER TECHNOLOGY, Vol: 177, Pages: 87-98, ISSN: 0032-5910
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- Citations: 33
Fennell PS, Davidson JF, Dennis JS, et al., 2007, Regeneration of sintered limestone sorbents for the sequestration of CO<sub>2</sub> from combustion and other systems, JOURNAL OF THE ENERGY INSTITUTE, Vol: 80, Pages: 116-119, ISSN: 1743-9671
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- Citations: 111
Kumar P, Fennell P, Britter R, 2007, Measurement and dispersion behaviour of particles in various size (5 NM>D<inf>P</inf><1000 NM) ranges in a Cambridge street canyon, Pages: 368-372
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- Citations: 4
Fennell PS, Kadchha S, Lee H-Y, et al., 2007, The measurement of the rate of burning of different coal chars in an electrically heated fluidised bed of sand, CHEMICAL ENGINEERING SCIENCE, Vol: 62, Pages: 608-618, ISSN: 0009-2509
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- Citations: 41
Muller CR, Davidson JF, Dennis JS, et al., 2007, Rise velocities of bubbles and slugs in gas-fluidised beds:: Ultra-fast magnetic resonance imaging, CHEMICAL ENGINEERING SCIENCE, Vol: 62, Pages: 82-93, ISSN: 0009-2509
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- Citations: 29
Fennell PS, Pacciani R, Dennis JS, et al., 2007, The Effects of Repeated Cycles of Calcination and Carbonation on a Variety of Different Limestones, as Measured in a Hot Fluidized Bed of Sand, Energy and Fuels, Vol: 21(4), Pages: 2072-2081
Fennell PS, Dennis JS, Hayhurst AN, 2007, The Size Distributions of Nanoparticles of the Oxides of Mg, Ba and Al in Flames: Their Measurement and Dependence on the Concentrations of Free Radicals in the Flame., Proceedings of the Combustion Institute, Vol: 31, Pages: 1939-1945
Müller CR, Rees AC, Mantle MD, et al., 2006, Investigation of the formation of jets in a three-dimensional gas-fluidized bed using magnetic resonance imaging
Magnetic Resonance Imaging (MRI) has been used to examine the flow of gas just above the distributor of 3-D beds of particles, fluidized by nitrogen gas. Three types of distributors were used: (i) multiple-orifice plates containing a triangular array of 19 drilled holes, each 1.0 or 1.5 mm in diameter, (ii) a multiple-orifice plate containing a triangular array of 37 drilled holes, each of 1.0 mm diameter, (iii) a plate drilled with a triangular array of holes but provided with a separate, central nozzle. It has been possible to extract geometric information, such as the length of the jet, from MR images, each averaged over ~ 4 min. The question as to whether or not the observed voids represent permanent jets or a stream of bubbles has been considered. The evidence from ultra-fast FLASH profiles strongly suggests that the lower part of the jets are permanent, whereas bubbles detach at the top of the jet; thus the top of the jet is of a rather transient nature. It was observed that for multi-orifice distributors, the jets of gas bend towards the centre and, in some cases merge, giving a central core of bubbles rising up the bed. This central core has not, therefore, been produced solely by coalescence events between single bubbles formed at the orifices in the distributor. The length of a jet was successfully correlated with operating variables using dimensional analysis. The frequency of bubble formation, i.e. bubble detachment from a jet, was derived from ultra-fast FLASH images. The measured frequencies are significantly lower than the frequencies predicted by the correlation of Davidson and Schüler [13]. A plausible reason for the discrepancy is that the complex jet structures seen in the fluidized beds used in this work were not allowed for in Davidson and Schüler's [13] analysis, which only postulates the formation and release of a bubble from an orifice.
Müller CR, Davidson JF, Dennis JS, et al., 2006, The rise of bubbles and slugs in gas-fluidized beds using ultra-fast Magnetic Resonance Imaging
Fluidized beds find many industrial applications, such as FCC, the gasification and combustion of coal, and Fischer-Tropsch synthesis. The rise velocities and coalescence of bubbles and slugs in a three-dimensional, gas-fluidized bed using magnetic resonance imaging. The rise velocities of bubbles and slugs were determined by means of cross-correlation functions and the results of these measurements were compared with those described in the literature using other techniques. In contrast to the rise velocity of a slug, the excess gas velocity (U - Umf) should not be added to the rise velocity of an isolated bubble to obtain its rise velocity in a bubbling bed. U is the superficial velocity of the gas and U = Umf at incipient fluidization. Bubbles undergo significant changes in velocity and shape when they coalesce. Bubbles experience a significant acceleration as they approach the top of a bed. This is an abstract of a paper presented at the AIChE Spring Annual Meeting - The 5th World Congress on Particle Technology (Orlando, FL 4/23-27/2006).
Fennell PS, Dennis JS, Hayhurst AN, 2006, Production of nanoparticles of MgO, BaO, and Al<sub>2</sub>O<sub>3</sub> in a premixed flame and its relation to the flame structure, COMBUSTION EXPLOSION AND SHOCK WAVES, Vol: 42, Pages: 642-648, ISSN: 0010-5082
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- Citations: 2
Rees AC, Davidson JF, Dennis JS, et al., 2006, The nature of the flow just above the perforated plate distributor of a gas-fluidised bed, as imaged using magnetic resonance, CHEMICAL ENGINEERING SCIENCE, Vol: 61, Pages: 6002-6015, ISSN: 0009-2509
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- Citations: 65
Müller CR, Davidson JF, Dennis JS, et al., 2006, Real-time measurement of bubbling phenomena in a three-dimensional gas-fluidized bed using ultrafast magnetic resonance imaging, PHYSICAL REVIEW LETTERS, Vol: 96, ISSN: 0031-9007
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- Citations: 67
Fennell PS, Davidson JF, Dennis JS, et al., 2005, A study of the mixing of solids in gas-fluidized beds, using ultra-fast MRI, CHEMICAL ENGINEERING SCIENCE, Vol: 60, Pages: 2085-2088, ISSN: 0009-2509
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- Citations: 31
Fennell PS, Hayhurst AN, Dennis J-S, et al., 2005, The kinetics of oxidation of chars from three different coals, as measured in fluidized beds, 18th International Conference on Fluidized Bed Combustion, Publisher: AMER SOC MECHANICAL ENGINEERS, Pages: 881-894
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- Citations: 1
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