heat transfer in three phase fluidized bed

... method pertaining to temperature gradients in the catalyst bed, fouling the heat transfer surfaces, flow uniformity, and temperature control Thus, the following aspects of the heat transfer in the ... reacting system, for example, by intensive stirring The ‘‘mechanical’’ energy introduced in the gas–liquid-solid reactors intensifies the interaction between all phases by increasing the phase ... carrying out a multiphase reaction on a solid catalyst is always a rather challenging task Not going deeply into the particularities inherent in a specific process, let us point out three main problems...

Ngày tải lên: 16/03/2014, 22:20

... and flow boiling Pool boiling is boiling on a heating surface submerged in a pool of initially quiescent liquid Flow boiling is boiling in a flowing stream of fluid, where the heating surface ... CHAPTER INTRODUCTION Boiling heat transfer is defined as a mode of heat transfer that occurs with a change in phase from liquid to vapor There are two basic types of boiling: pool boiling and ... Boiling Crisis in Ordinary Liquids 81 2.4.3.2 2.4.3 Boiling Crisis with Liquid Metals 97 Film Boiling in a Pool 102 2.4.4.1 Film Boiling in Ordinary Liquids 103 2.4.4.2 2.4.4 Film Boiling in Liquid...

Ngày tải lên: 02/04/2014, 15:22

... HYDRODYNAMICS, MASS AND HEAT TRANSFER IN CHEMICAL ENGINEERING Topics in Chemical Engineering A series edited by R Hughes, University of Salford, UK Volume HEAT AND MASS TRANSFER W PACKED BEDS by N Wakao ... this book for other titles in the Topics in Chemical Engineering series HYDRODYNAMICS, MASS AND HEAT TRANSFER IN CHEMICAL ENGINEERING A.D Polyanin lnstitute for Problems in Mechanics, Moscow, Russia ... may be reprinted or reproduced or utilised in any form or by any electronic, mechanical, or other means, now known or hereafter invented, including photocopying and recording, or in any information...

Ngày tải lên: 02/04/2014, 15:52

... earthing impedance of a station according to Equation (16) Z ETtot Total earthing impedance of the short circuited tower according to Equation (21) ZP Driving point impedance of an infinite chain ... short circuit in high-voltage three- phase AC systems operating at nominal frequency 50 Hz or 60 Hz, i.e a) currents during two separate simultaneous line-to-earth short circuits in isolated neutral ... on the following documents: FDIS Voting report 73/127/FDIS 73/128/RVD Full information on the voting for the approval of this standard can be found in the report on voting indicated in the above...

Ngày tải lên: 04/04/2014, 11:58

... Pulse Interactions with Metal Films, Numer Heat Transfer A, vol 40, pp 1–20, 2001 D Y Tzou and K S Chiu, Temperature-Dependent Thermal Lagging in Ultrafast Laser Heating, Int J Heat Mass Transfer, ... Qiu and C L Tien, Heat Transfer Mechanisms during Short-Pulse Laser Heating of Metals, ASME J Heat Transfer, vol 115, pp 835–841, 1993 T Q Qiu and C L Tien, Femtosecond Laser Heating of Multi-Layer ... H Song, Experimental and Numerical Investigation of Heat Transfer and Phase Change Phenomena during Excimer Laser Interaction with Nickel, Int J Heat Mass Transfer, vol 42, pp 1371–1382, 1999...

Ngày tải lên: 06/05/2014, 08:53

... (single -phase two-winding) (three- phase two-winding) (single -phase three- winding and single -phase two-winding) (single -phase three- winding) Vl V √l Vl V √l : √ : 3 Vl V √ and 2l In V √l Winding ... filter, in: PESC’88, April, 1988, pp 1151–1158 C.A Quinn, N Mohan, Active filtering of harmonic currents in three- phase, four-wire systems with three- phase and single -phase nonlinear loads, in: Proc ... 2) Cost of the compensator : Vl In In Vl In V √l : = 0.333Vl In Vl In √ = 0.577Vl In √ 3 + : Vl Vl In = 0.359Vl In No Lowest No : V √l : V √l In Vl In √ = 0.577Vl In No Low No Yes High Yes No Highest...

Ngày tải lên: 11/05/2014, 22:06

... studies of granular bed heat transfer 1.3 Flow and heat transfer studies of particulate systems using DEM 13 1.4 Study of granular flow and heat transfer in screw conveyors ... Visualization of axial mixing of particle bed in screw conveyor heat exchanger (Base case: 150 kg h-1, 11 rpm, 1.0) 92 5.1 Binning the screw conveyor domain for heat transfer analysis ... was originally developed for understanding discrete mechanical interactions between particles, there have been increasing sentiments among DEM users to incorporate heat transfer capability into...

Ngày tải lên: 02/10/2015, 17:14

... studies of granular bed heat transfer 1.3 Flow and heat transfer studies of particulate systems using DEM 13 1.4 Study of granular flow and heat transfer in screw conveyors ... Visualization of axial mixing of particle bed in screw conveyor heat exchanger (Base case: 150 kg h-1, 11 rpm, 1.0) 92 5.1 Binning the screw conveyor domain for heat transfer analysis ... was originally developed for understanding discrete mechanical interactions between particles, there have been increasing sentiments among DEM users to incorporate heat transfer capability into...

Ngày tải lên: 07/10/2015, 10:10

... Isenthalpic Line 600 Inversion Line 500 Heating Region UJ-T < Isenthalpic Line Cooling Region UJ-T > 400 Max Inversion Pressure 300 Critical Point Isenthalpic Line 200 Tmin 100 Boiling Point Po Isenthalpic ... pressure incoming fluid fa High pressure vapor state in two -phase condition fl High pressure liquid state in two -phase condition finm Contact between capillary tube & fins (Area) fin Capillary fins ... RECUPERATIVE HEAT EXCHAGER COOLING J-T VALVE AFTER COOLING b) CLAUDE TYPE HEAT EXCHANGER COMPRESSOR COLD EXPANSION ENGINE RECUPERATIVE HEAT EXCHAGER COOLING COLD EXPANSION ENGINE AFTER COOLING c) JOULE-BRAYTON...

Ngày tải lên: 27/11/2015, 11:20

... grain filling procedure to realize the fixed bed was avoided [24] The combined catalytic filter was tested with naphthalene as model tar compound and also in experiments in a bubbling fluidized bed ... monolith integrated in the hollow cylindrical space of the catalytic filter candle [24] The incorporation of the monolith increased the Ni load of the catalytic filter Promising results were obtained ... flexibility to integrate a custom-made tar reforming catalyst and their capability to integrate high amount of this catalyst in the hollow cylindrical space inside the filter candle considering the limitations...

Ngày tải lên: 29/07/2016, 14:02

... entering the impingers The sampling train consisted of four borosilicate glass impingers connected in series and fitted with ground taper joint with O-rings seals The impinger train was placed in ... output streams by leaving in the gas phase or binding/retaining with solid particulates, thus Q i ;In ¼ Q i;fuel þ Q i ;bed ð5Þ Q i;out ¼ Q i;gas þ Q i;char þ Q i ;bed0 ð6Þ where, Qi ,In and Qi,out are ... species in dry syngas, w/N2, ppm H2S COS C4H4S Bed char, g Ash content in bed char, % Filter char, g Ash content in filter char, % Input of bed material Input of bed material, g Output of bed material...

Ngày tải lên: 29/07/2016, 14:03

... LHV LNG LPG Bubbling Fluidized Bed Circulating Fluidized Bed lower heating value liquefied natural gas liquefied petroleum gas ER FN PAHs RPM compositions and quality Low heating value (LHV) of ... husk in fluidized bed reactors Biomass Bioenergy 1998;14:533–46 [23] Jain V, Groulx D, Basu P Study of heat transfer between an over -bed oil burner flame and a fluidized bed during start-up: determination ... of the gasifier, the main combustion reaction occurs within narrower regions comparing to other cases In addition, leveling-off of temperature in the fluidized bed is less since FN is less than...

Ngày tải lên: 01/08/2016, 09:30

... heat transfer past a semi-infinite vertical porous moving plate with variable suction, Int.J Engng Sci 2000, 38, 833-845 [12] Singh K D., Sharma R Three dimensional free convective flow and heat ... problem Consider the three dimensional flow of a viscous incompressible fluid past an infinite vertical porous plate embedded in a porous medium in presence of periodic suction A coordinate system is ... sign in the above equation indicates that the suction is towards the plate Due to this kind of injection velocity the flow remains three dimensional All the physical quantities involved are independent...

Ngày tải lên: 05/09/2013, 14:58

... of the initial size at the reactor inlet (shrinking caused by the flaming-pyrolysis step) [13] - Conversion of bio-char particles in the reduction zone is achieved following the shrinking unreacted ... beginning of the char bed The observed sharp decrease is caused by the intensive convection heat transfer taking place between the gas and solid phases As the flow progresses down through the bed, ... different shapes The central conversion increases rapidly at the beginning the bed and exceeds 60% then the increase is reduced at the remaining zone of the bed In fact, both the high temperature...

Ngày tải lên: 01/08/2016, 09:31

... Solar drying systems: Simulations and optimization, Agrotech Publishing Academy, Udaipur, pp 131-133 Haghighi K., Segerlind L.J, (1988), Modeling Simultaneous Heat and Mass Transfer in Isotropic ... Trans ASEA, pp 31 Husain A., Chen C.S., Clayton J T, Whitney L.F (1972), Mathematical Simulation of Mass and Heat Transfer in High Moisture Foods, Trans ASAE, pp 55-59 224 Husain A., Chen C.S., Clayton ... Chen C.S., Clayton J T (1973), Simultaneuos Heat and Mass Diffusion in Biological Material, Trans ASAE, pp 69-73 Luikov, A V (1980), Heat and mass transfer, Mir Publisher, Moscow Peebles E D,...

Ngày tải lên: 28/08/2013, 08:31

... reasonable accuracy In a recent study, Cho et al [12] investigated the effect of a gap in the inclined rib on heat transfer in a square duct and reported that a gap in the inclined rib accelerates ... turbulence which will result in an increase in the heat transfer They reported that the inclined rib arrangement with a downstream gap position shows higher enhancement in heat transfer compared to that ... on the heated wall in transverse, inclined, V-continuous and V- discrete pattern Int Journal of Heat Mass Transfer 2003; 30(2): 241-250 [17] Bhagoria J.L and Sahu M.M Augmentation of heat transfer...

Ngày tải lên: 05/09/2013, 16:10

... eStudio Calamar, Berlin/Figueres Printed on acid-free paper Springer is part of Springer Science+Business Media (www.springer.com) Contents Treatment of Rising Damp in Historical Buildings ... capillarity In most cases, these three mechanisms account for variations in moisture content in building Treatment of Rising Damp in Historical Buildings w max w kg/m3 Capillary domain w cr Monomolecular ... dependant on the surface finishing materials and furnishing According to the principle, a hygroscopic inertia index was defined as a single number, representing the hygroscopic inertia of a room and that...

Ngày tải lên: 31/03/2014, 16:20

... and Heat Transfer in a Single -Phase Flow 33 2.3 Pressure Drop and Heat Transfer in a Single -Phase Flow Many correlations have been proposed in literature for the friction factor and heat transfer, ... critical heat flux (CHF), constituting the upper design limit for any phase- change cooling system The main problem in single -phase micro-channel cooling are freezing thresholds required in the electronics ... theoretical and experimental investigations covering various aspects of heat transfer in micro-channel heat sinks with phase change The flow and heat transfer in heated micro-channels are accompanied by...

Ngày tải lên: 02/04/2014, 15:51

... courses in mass and heat transfer in that more emphasis is placed on mass transfer and the importance of systematic analysis The course in mass and heat transfer in the chemical engineering curriculum ... concentrating on Level III In Part II we solve some Level V problems to gain insight into the small-scale fluid motions affecting heat and mass transfer Figure 1.2, modified from that presented in Introduction ... become the Teaching Fellows in various courses after their positive experience in the mass and heat transfer course Damien Th´ v´ nin took great care in preparing some of the figures in this text,...

Ngày tải lên: 02/04/2014, 15:52