Direct simulations of aggregates in homogeneous isotropic turbulence
- 238 Downloads
We study aggregation in turbulent flow by means of particle-resolved, direct numerical simulations. Mono-sized spheres with an attractive square-well potential are released in homogeneous, isotropic turbulence generated through linear forcing. Typical cases have a solids volume fraction of 0.08 and a ratio of the Kolmogorov scale over the primary sphere radius of O(0.1). The latter implies that the flow around the primary spheres is inhomogeneous. The simulations show the continuous formation and breakage of aggregates as a result of the turbulence and the attractive potential. The average size of the aggregates is a pronounced function of the strengths of turbulence and interaction potential. Fractal dimensions of the aggregates are in the range 1.4–1.8 for the cases studied.
KeywordsFractal Dimension Direct Numerical Simulation Primary Particle Aggregate Size Isotropic Turbulence
Unable to display preview. Download preview PDF.
- 1.Ramkrishna D.: Population Balances—Theory and Applications to Particulate Systems in Engineering. Academic Press, London (2000)Google Scholar
- 3.Aamir E., Nagy Z.K., Rielly C.D., Kleinert T., Judat B.: Combined quadrature method of moments and method of characteristics approach for efficient solution of population balance models for dynamic modeling and crystal size distribution control of crystallization processes. Ind. Eng. Chem. Res. 48, 8575–8584 (2009)CrossRefGoogle Scholar
- 14.Rosales, C., Meneveau, C.: Linear forcing in numerical simulations of isotropic turbulence: physical space implementations and convergence properties. Phys. Fluids 17, 095106-1–095106-8 (2005)Google Scholar
- 24.Kim S., Karrila S.J.: Microhydrodynamics: Principles and Selected Applications. Butterworth-Heinemann, Boston (1991)Google Scholar