Imperial College London
Alternate

ProfessorGeorgePapadakis

Faculty of Engineering, Department of Aeronautics

Professor of Aerodynamics
 
 
 
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Contact

 

+44 (0)20 7594 5080g.papadakis

 
 
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Location

 

331City and Guilds BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Tang:2022:10.1017/jfm.2022.516,
author = {Tang, HY and Rigopoulos, S and Papadakis, G},
doi = {10.1017/jfm.2022.516},
journal = {Journal of Fluid Mechanics},
title = {On the interaction of turbulence with nucleation and growth in reaction crystallisation},
url = {http://dx.doi.org/10.1017/jfm.2022.516},
volume = {944},
year = {2022}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - The objective of this work is to investigate the interaction of turbulence with the nonlinear processes of particle nucleation and growth that occur in reaction crystallisation, also known as precipitation. A validated methodology for coupling the population balance equation with direct numerical simulation of turbulent flows is employed for simulating an experiment conducted by Schwarzer <jats:italic>et al.</jats:italic> (<jats:italic>Chem. Engng Sci.</jats:italic>, vol. 61, no. 1, 2006, pp. 167–181), where barium sulphate nanoparticles are formed by mixing and reaction of barium chloride and sulphate acid in a T-mixer, with the spatial resolution resolved down to the Kolmogorov scale. A unity Schmidt number is assumed, since at present it is not possible to resolve the Batchelor scale for realistic Schmidt numbers (order of 1000 or more). The probability density function, filtered averages and spatial distribution of time and length scales are all examined in order to shed light on the interplay of turbulence and precipitation. Separate Damköhler numbers are defined for nucleation and growth and both are found to be close to unity, indicating that the process is neither mixing nor kinetics controlled. The nucleation length scales are also evaluated and compared with the Kolmogorov scale to show the importance of resolving nucleation bursts. In addition, zones of different rate-determining mechanisms are identified. The ultimate aim of precipitation is to obtain control over the product particle size distribution, and the present study elucidates the synergistic or competing roles of mixing, nucleation and growth on the process outcome and discusses the implications for modelling.
AU  - Tang,HY
AU  - Rigopoulos,S
AU  - Papadakis,G
DO  - 10.1017/jfm.2022.516
PY  - 2022///
SN  - 0022-1120
TI  - On the interaction of turbulence with nucleation and growth in reaction crystallisation
T2  - Journal of Fluid Mechanics
UR  - http://dx.doi.org/10.1017/jfm.2022.516
UR  - https://www.cambridge.org/core/journals/journal-of-fluid-mechanics/article/on-the-interaction-of-turbulence-with-nucleation-and-growth-in-reaction-crystallisation/D6F9E2127B9F576DBC6EB681DECD9A1B
UR  - http://hdl.handle.net/10044/1/98289
VL  - 944
ER  -
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