A way of a single biomass particle shape characterization in a CFD model

Anna Trubetskaya, Gert Beckmann, Peter Arendt Jensen, Anker Degn Jensen, Peter Glarborg

Research output: Contribution to conferenceConference abstract for conferenceResearchpeer-review

Abstract

In this study, sieving, 2D imaging analysis (CAMSIZER/CAMSIZER XT) and optical microscopy were applied to the characterization of the size and shape of biomass particles. The 2D imaging technology was found to be the most convenient characterization method, providing information on the shape and external surface area of the particles. Different biomass samples were measured with an optical microscope and the results were compared with those from 2D imaging analysis. The main result of this study is that the data on particle width, measured by these two techniques, is identical. However, for the particle length, measured by 2D imaging analysis, it is proposed to apply a correction factor equal to cos (45°). Based on the analysis of different biomass types, it is recommended to set the particle’s thickness to 2/3 of its width. In this study, a way to quantify all three dimensions of biomass particles was established.
For the shape representation of biomass particles in the combustion model, measurements on CAMSIZER/CAMSIZER XT were carried out to estimate geometrical parameters as sphericity, aspect ratio and symmetry of the total particle size distribution. Additionally, a calculation of shape factors was conducted, in which shape factors were determined by relating irregular-shaped biomass particles to regular geometrical bodies such as a cylinder, parallelepiped, sphere and ellipsoid. Based on the calculated shape factors and the main principles of the combustion phenomena, it is recommended to represent a biomass particle in CFD models as an infinite cylinder with the ratio of volume to surface area (V/A) measured with CAMSIZER/CAMSIZER XT technology for the total particle size distribution and multiplied with the estimated correction factor 1.5. Alternatively, the ratio of volume to surface area (V/A) can be implemented by using equations for the volume and surface area of different geometrical forms, correlated to three dimensions, measured either by 2D imaging technology with the main advantage to conduct measurements quickly with the reproducible results by using small amount of samples, or optical microscopy.
Original languageEnglish
Publication date2014
Number of pages1
Publication statusPublished - 2014
Event22nd European Biomass Conference and Exhibition - CCH - Congress Center Hamburg, Hamburg, Germany
Duration: 23 Jun 201426 Jun 2014
Conference number: 22

Conference

Conference22nd European Biomass Conference and Exhibition
Number22
LocationCCH - Congress Center Hamburg
CountryGermany
CityHamburg
Period23/06/201426/06/2014

Cite this

Trubetskaya, A., Beckmann, G., Jensen, P. A., Jensen, A. D., & Glarborg, P. (2014). A way of a single biomass particle shape characterization in a CFD model. Abstract from 22nd European Biomass Conference and Exhibition, Hamburg, Germany.
Trubetskaya, Anna ; Beckmann, Gert ; Jensen, Peter Arendt ; Jensen, Anker Degn ; Glarborg, Peter. / A way of a single biomass particle shape characterization in a CFD model. Abstract from 22nd European Biomass Conference and Exhibition, Hamburg, Germany.1 p.
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abstract = "In this study, sieving, 2D imaging analysis (CAMSIZER/CAMSIZER XT) and optical microscopy were applied to the characterization of the size and shape of biomass particles. The 2D imaging technology was found to be the most convenient characterization method, providing information on the shape and external surface area of the particles. Different biomass samples were measured with an optical microscope and the results were compared with those from 2D imaging analysis. The main result of this study is that the data on particle width, measured by these two techniques, is identical. However, for the particle length, measured by 2D imaging analysis, it is proposed to apply a correction factor equal to cos (45°). Based on the analysis of different biomass types, it is recommended to set the particle’s thickness to 2/3 of its width. In this study, a way to quantify all three dimensions of biomass particles was established. For the shape representation of biomass particles in the combustion model, measurements on CAMSIZER/CAMSIZER XT were carried out to estimate geometrical parameters as sphericity, aspect ratio and symmetry of the total particle size distribution. Additionally, a calculation of shape factors was conducted, in which shape factors were determined by relating irregular-shaped biomass particles to regular geometrical bodies such as a cylinder, parallelepiped, sphere and ellipsoid. Based on the calculated shape factors and the main principles of the combustion phenomena, it is recommended to represent a biomass particle in CFD models as an infinite cylinder with the ratio of volume to surface area (V/A) measured with CAMSIZER/CAMSIZER XT technology for the total particle size distribution and multiplied with the estimated correction factor 1.5. Alternatively, the ratio of volume to surface area (V/A) can be implemented by using equations for the volume and surface area of different geometrical forms, correlated to three dimensions, measured either by 2D imaging technology with the main advantage to conduct measurements quickly with the reproducible results by using small amount of samples, or optical microscopy.",
author = "Anna Trubetskaya and Gert Beckmann and Jensen, {Peter Arendt} and Jensen, {Anker Degn} and Peter Glarborg",
year = "2014",
language = "English",
note = "22nd European Biomass Conference and Exhibition, EUBCE 2014 ; Conference date: 23-06-2014 Through 26-06-2014",

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Trubetskaya, A, Beckmann, G, Jensen, PA, Jensen, AD & Glarborg, P 2014, 'A way of a single biomass particle shape characterization in a CFD model', 22nd European Biomass Conference and Exhibition, Hamburg, Germany, 23/06/2014 - 26/06/2014.

A way of a single biomass particle shape characterization in a CFD model. / Trubetskaya, Anna; Beckmann, Gert; Jensen, Peter Arendt; Jensen, Anker Degn; Glarborg, Peter.

2014. Abstract from 22nd European Biomass Conference and Exhibition, Hamburg, Germany.

Research output: Contribution to conferenceConference abstract for conferenceResearchpeer-review

TY - ABST

T1 - A way of a single biomass particle shape characterization in a CFD model

AU - Trubetskaya, Anna

AU - Beckmann, Gert

AU - Jensen, Peter Arendt

AU - Jensen, Anker Degn

AU - Glarborg, Peter

PY - 2014

Y1 - 2014

N2 - In this study, sieving, 2D imaging analysis (CAMSIZER/CAMSIZER XT) and optical microscopy were applied to the characterization of the size and shape of biomass particles. The 2D imaging technology was found to be the most convenient characterization method, providing information on the shape and external surface area of the particles. Different biomass samples were measured with an optical microscope and the results were compared with those from 2D imaging analysis. The main result of this study is that the data on particle width, measured by these two techniques, is identical. However, for the particle length, measured by 2D imaging analysis, it is proposed to apply a correction factor equal to cos (45°). Based on the analysis of different biomass types, it is recommended to set the particle’s thickness to 2/3 of its width. In this study, a way to quantify all three dimensions of biomass particles was established. For the shape representation of biomass particles in the combustion model, measurements on CAMSIZER/CAMSIZER XT were carried out to estimate geometrical parameters as sphericity, aspect ratio and symmetry of the total particle size distribution. Additionally, a calculation of shape factors was conducted, in which shape factors were determined by relating irregular-shaped biomass particles to regular geometrical bodies such as a cylinder, parallelepiped, sphere and ellipsoid. Based on the calculated shape factors and the main principles of the combustion phenomena, it is recommended to represent a biomass particle in CFD models as an infinite cylinder with the ratio of volume to surface area (V/A) measured with CAMSIZER/CAMSIZER XT technology for the total particle size distribution and multiplied with the estimated correction factor 1.5. Alternatively, the ratio of volume to surface area (V/A) can be implemented by using equations for the volume and surface area of different geometrical forms, correlated to three dimensions, measured either by 2D imaging technology with the main advantage to conduct measurements quickly with the reproducible results by using small amount of samples, or optical microscopy.

AB - In this study, sieving, 2D imaging analysis (CAMSIZER/CAMSIZER XT) and optical microscopy were applied to the characterization of the size and shape of biomass particles. The 2D imaging technology was found to be the most convenient characterization method, providing information on the shape and external surface area of the particles. Different biomass samples were measured with an optical microscope and the results were compared with those from 2D imaging analysis. The main result of this study is that the data on particle width, measured by these two techniques, is identical. However, for the particle length, measured by 2D imaging analysis, it is proposed to apply a correction factor equal to cos (45°). Based on the analysis of different biomass types, it is recommended to set the particle’s thickness to 2/3 of its width. In this study, a way to quantify all three dimensions of biomass particles was established. For the shape representation of biomass particles in the combustion model, measurements on CAMSIZER/CAMSIZER XT were carried out to estimate geometrical parameters as sphericity, aspect ratio and symmetry of the total particle size distribution. Additionally, a calculation of shape factors was conducted, in which shape factors were determined by relating irregular-shaped biomass particles to regular geometrical bodies such as a cylinder, parallelepiped, sphere and ellipsoid. Based on the calculated shape factors and the main principles of the combustion phenomena, it is recommended to represent a biomass particle in CFD models as an infinite cylinder with the ratio of volume to surface area (V/A) measured with CAMSIZER/CAMSIZER XT technology for the total particle size distribution and multiplied with the estimated correction factor 1.5. Alternatively, the ratio of volume to surface area (V/A) can be implemented by using equations for the volume and surface area of different geometrical forms, correlated to three dimensions, measured either by 2D imaging technology with the main advantage to conduct measurements quickly with the reproducible results by using small amount of samples, or optical microscopy.

M3 - Conference abstract for conference

ER -

Trubetskaya A, Beckmann G, Jensen PA, Jensen AD, Glarborg P. A way of a single biomass particle shape characterization in a CFD model. 2014. Abstract from 22nd European Biomass Conference and Exhibition, Hamburg, Germany.