TY - JOUR
T1 - Improvement of heat- and mass transfer modeling for single iron particles combustion using resolved simulations
AU - Thijs, L.C.
AU - van Gool, C.E.A.G.
AU - Ramaekers, W.J.S.
AU - Kuerten, J.G.M.
AU - van Oijen, Jeroen A.
AU - de Goey, Philip
PY - 2024
Y1 - 2024
N2 - In this work, we use a boundary layer resolved model to improve a Lagrangian point particle model to simulate the combustion of single iron particles. By resolving the full boundary layer, mass and heat transfer are accurately modeled, including Stefan flow. Therefore, the model is suitable to improve point particle models. This work focuses on the first stage of iron combustion, which lasts up to the maximum temperature. Temperature- and composition-dependent properties are used and phase transitions from solid to liquid and liquid to gas are taken into account. The Nusselt and Sherwood correlations are investigated in conditions typical for iron particle combustion. It is found that the 1/2-film temperature is the best film rule to use to model heat- and mass transfer for iron particle combustion. The boundary layer resolved model is used to validate the point particle models. Then, the model is systematically elaborated by including a temperature-dependent particle density, slip velocity and Stefan flow. The individual and combined effect of these phenomena on the burn duration are investigated. Including all these effects decreases the time to maximum temperature by around 25%. Furthermore, it is shown that if one neglects physical phenomena like slip and Stefan flow, but uses the 1/3-film rule instead of the 1/2-film rule, errors cancel and still reasonable agreement is obtained with experiments.
AB - In this work, we use a boundary layer resolved model to improve a Lagrangian point particle model to simulate the combustion of single iron particles. By resolving the full boundary layer, mass and heat transfer are accurately modeled, including Stefan flow. Therefore, the model is suitable to improve point particle models. This work focuses on the first stage of iron combustion, which lasts up to the maximum temperature. Temperature- and composition-dependent properties are used and phase transitions from solid to liquid and liquid to gas are taken into account. The Nusselt and Sherwood correlations are investigated in conditions typical for iron particle combustion. It is found that the 1/2-film temperature is the best film rule to use to model heat- and mass transfer for iron particle combustion. The boundary layer resolved model is used to validate the point particle models. Then, the model is systematically elaborated by including a temperature-dependent particle density, slip velocity and Stefan flow. The individual and combined effect of these phenomena on the burn duration are investigated. Including all these effects decreases the time to maximum temperature by around 25%. Furthermore, it is shown that if one neglects physical phenomena like slip and Stefan flow, but uses the 1/3-film rule instead of the 1/2-film rule, errors cancel and still reasonable agreement is obtained with experiments.
KW - Metal fuel
KW - Nusselt and Sherwood number
KW - boundary layer resolved
KW - iron
KW - point particle
UR - http://www.scopus.com/inward/record.url?scp=85132791446&partnerID=8YFLogxK
U2 - 10.1080/00102202.2022.2089030
DO - 10.1080/00102202.2022.2089030
M3 - Article
SN - 0010-2202
VL - 196
SP - 572
EP - 588
JO - Combustion Science and Technology
JF - Combustion Science and Technology
IS - 4
ER -