Zobrazeno 1 - 10
of 25
pro vyhledávání: '"Alf-Erik Almstedt"'
Publikováno v:
Powder Technology. 270:68-82
In this paper we combine Eulerian-Lagrangian and Eulerian-Eulerian frameworks to simulate the behavior of a limited number of fuel particles in a bulk of inert particles in a bubbling gas-solid fluidized bed. The gas and the inert phase are treated a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::07206ae51d6e958b0713a44c837976e6
https://doi.org/10.1016/j.powtec.2014.09.050
https://doi.org/10.1016/j.powtec.2014.09.050
Publikováno v:
Industrial & Engineering Chemistry Research. 52:5791-5805
Lagrangian simulations are performed to investigate the process of fuel mixing in fluidized-bed energy converters. The computations are carried out for a narrow (0.4 m) and a wide (1.2 m) bed. Movement of a limited number of large and light particles
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7d3907e24dbdb65e11d8087f96327e13
https://doi.org/10.1021/ie301515v
https://doi.org/10.1021/ie301515v
Publikováno v:
Chemical Engineering Science. 66:5628-5637
This paper presents a novel Lagrangian approach to model fuel mixing in gas-solid fluidized beds. In the mixing process, fuel particles are considerably larger than the inert bed material and therefore, the present work proposes three grids to accoun
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a731841d37cc94049a9a43153b24e107
https://doi.org/10.1016/j.ces.2011.07.060
https://doi.org/10.1016/j.ces.2011.07.060
Autor:
Srdjan Sasic, Alf-Erik Almstedt
Publikováno v:
International Journal of Heat and Fluid Flow. 31:1058-1064
A particle-level simulation technique has been developed for modelling the flow of fibres in a turbulent flow field. A single fibre is conceived here as a chain of segments, thus enabling the model fibre to have all the degrees of freedom (translatio
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::bac39b825ea49ec1bce28ca7459ed526
https://doi.org/10.1016/j.ijheatfluidflow.2010.05.009
https://doi.org/10.1016/j.ijheatfluidflow.2010.05.009
Publikováno v:
Chemical Engineering Science. 61:1705-1717
This work compares numerical simulations of fluid dynamics in fluidized beds using different closure models and air feed system models. The numerical results are compared to experiments by means of power spectral density distributions of fluctuating
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5a14b6e649858ab719f4285ab246afbc
https://doi.org/10.1016/j.ces.2005.09.014
https://doi.org/10.1016/j.ces.2005.09.014
Publikováno v:
Powder Technology. 151:19-26
The calibration of a dual fibre optical probe was experimentally investigated in a circulating fluidized bed. The particle volume fraction registered by the optical probe was compared to pressure drop measurements for a range of operating conditions.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5015c1bb2ade1be49c48d85f607034ab
https://doi.org/10.1016/j.powtec.2004.11.028
https://doi.org/10.1016/j.powtec.2004.11.028
Autor:
Anders Hjörnhede, Filip Johnsson, Rikard Norling, Alf-Erik Almstedt, Kent Johansson, Anders Nylund
Publikováno v:
Chemical Engineering Science. 59:31-40
Hydrodynamic measurements were made in a bubbling fluidized bed operated at 550°C at three different excess gas velocities (0.15, 0.40 and 0.75 m / s ). The bed has a cross-sectional area of 0.2 m ×0.3 m with an immersed tube bank consisting of 59
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::453f137609879ac9ca91c24f0ffa1bf1
https://doi.org/10.1016/j.ces.2003.09.027
https://doi.org/10.1016/j.ces.2003.09.027
Autor:
B.G.M. van Wachem, Alf-Erik Almstedt
Publikováno v:
Chemical Engineering Journal. 96:81-98
This paper presents an overview of the physical models for computational fluid dynamic (CFD) predictions of multiphase flows. The governing equations and closure models are derived and presented for fluid-solid flows and fluid-fluid flows, both in an
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::76f1b2b30e923237ac410b6a94eb3de0
https://doi.org/10.1016/j.cej.2003.08.025
https://doi.org/10.1016/j.cej.2003.08.025
Publikováno v:
Experiments in Fluids. 35:572-579
Numerous optical probe designs to measure particle volume fraction have been proposed in the literature. Unfortunately, almost all of them suffer from an ill-defined measurement volume, poor sensitivity or require frequent and tedious calibration. We
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::79c2fec2f719066514388f5e7b68b5cb
https://doi.org/10.1007/s00348-003-0703-0
https://doi.org/10.1007/s00348-003-0703-0
Publikováno v:
Experimental Thermal and Fluid Science. 27:187-191
A wedge-shaped hot-film probe is used to perform measurements of turbulence intensity and an estimate of the turbulent kinetic energy as well as the Eulerian spectra, macro- and micro-scales of the gas phase in a horizontal pipe flow carrying pulp fi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ae4ebe13a968f2a67e14cb5267192a1e
https://doi.org/10.1016/s0894-1777(02)00283-2
https://doi.org/10.1016/s0894-1777(02)00283-2