### Abstract

Two-fluid model (TFM) has been widely used to simulate particle-fluid flows, with two model formulations available: Model A and Model B [1–3]. Previous studies have shown that both models generate comparable results for some flows, but their possible application limitations have not been well addressed. Recently, Zhou et al. [4] discussed this issue in the framework of coupled CFD (computational fluid dynamics) and DEM (discrete element method), indicating that both models are largely applicable to simple flows such as fluidization and pneumatic conveying, but the so-called Model B is not applicable to complicated three-dimensional flows such as that in a hydrocyclone. However, it is not clear such limitations still exist in TFM. In this work, both Model A and Model B are applied to model two typical cases, i.e., gas-solid fluidized bed and hydrocyclone. It is demonstrated that Model B is not applicable to hydrocyclones while both models are applicable to fluidized beds. The results confirm that, Model B, as a simplified model, is not applicable to the flows where the pressure gradient force is significant and its direction is quite different from that of the drag force. To overcome this problem, its original formulations, which are somehow ignored in the literature, should be used.

Original language | English |
---|---|

Pages (from-to) | 47-54 |

Number of pages | 8 |

Journal | Powder Technology |

Volume | 329 |

DOIs | |

Publication status | Published - 15 Apr 2018 |

### Keywords

- Fluidization
- Hydrocyclone
- Model A and Model B
- Multiphase flow
- Two-fluid model

### Cite this

}

*Powder Technology*, vol. 329, pp. 47-54. https://doi.org/10.1016/j.powtec.2018.01.058

**Model A vs. Model B in the modelling of particle-fluid flow.** / Chu, K. W.; Kuang, S. B.; Zhou, Z. Y.; Yu, A. B.

Research output: Contribution to journal › Article › Research › peer-review

TY - JOUR

T1 - Model A vs. Model B in the modelling of particle-fluid flow

AU - Chu, K. W.

AU - Kuang, S. B.

AU - Zhou, Z. Y.

AU - Yu, A. B.

PY - 2018/4/15

Y1 - 2018/4/15

N2 - Two-fluid model (TFM) has been widely used to simulate particle-fluid flows, with two model formulations available: Model A and Model B [1–3]. Previous studies have shown that both models generate comparable results for some flows, but their possible application limitations have not been well addressed. Recently, Zhou et al. [4] discussed this issue in the framework of coupled CFD (computational fluid dynamics) and DEM (discrete element method), indicating that both models are largely applicable to simple flows such as fluidization and pneumatic conveying, but the so-called Model B is not applicable to complicated three-dimensional flows such as that in a hydrocyclone. However, it is not clear such limitations still exist in TFM. In this work, both Model A and Model B are applied to model two typical cases, i.e., gas-solid fluidized bed and hydrocyclone. It is demonstrated that Model B is not applicable to hydrocyclones while both models are applicable to fluidized beds. The results confirm that, Model B, as a simplified model, is not applicable to the flows where the pressure gradient force is significant and its direction is quite different from that of the drag force. To overcome this problem, its original formulations, which are somehow ignored in the literature, should be used.

AB - Two-fluid model (TFM) has been widely used to simulate particle-fluid flows, with two model formulations available: Model A and Model B [1–3]. Previous studies have shown that both models generate comparable results for some flows, but their possible application limitations have not been well addressed. Recently, Zhou et al. [4] discussed this issue in the framework of coupled CFD (computational fluid dynamics) and DEM (discrete element method), indicating that both models are largely applicable to simple flows such as fluidization and pneumatic conveying, but the so-called Model B is not applicable to complicated three-dimensional flows such as that in a hydrocyclone. However, it is not clear such limitations still exist in TFM. In this work, both Model A and Model B are applied to model two typical cases, i.e., gas-solid fluidized bed and hydrocyclone. It is demonstrated that Model B is not applicable to hydrocyclones while both models are applicable to fluidized beds. The results confirm that, Model B, as a simplified model, is not applicable to the flows where the pressure gradient force is significant and its direction is quite different from that of the drag force. To overcome this problem, its original formulations, which are somehow ignored in the literature, should be used.

KW - Fluidization

KW - Hydrocyclone

KW - Model A and Model B

KW - Multiphase flow

KW - Two-fluid model

UR - http://www.scopus.com/inward/record.url?scp=85041475009&partnerID=8YFLogxK

U2 - 10.1016/j.powtec.2018.01.058

DO - 10.1016/j.powtec.2018.01.058

M3 - Article

VL - 329

SP - 47

EP - 54

JO - Powder Technology

JF - Powder Technology

SN - 0032-5910

ER -