Abstract:
:Numerical simulations and experimental validations were conducted to determine grit removal efficiency and separation processes for inorganic suspended solids (ISS) with different particle sizes in a vortex-type grit chamber (Pista). The Euler-Lagrange method was used to simulate solid-liquid two-phase flow; the Unsteady Discrete Model was used to simulate the solid phase; and the Renormalization Group k-epsilon (RNG k-ε), Realizable k-epsilon (Real k-ε), and Shear Stress Transmission k-ω (SST k-ω) models were used to simulate the liquid phase. Results of the RNG k-ε model agreed well with the experimental results for particles with d ≤ 200 µm, with an average error of 7.10% (d < 100 µm) and 6.78% (100 µm ≤ d ≤ 200 µm). When particle size exceeded 200 µm, the Real k-ε model had the minimum average error (4.16%). Bed load transport and suspended load transport of the different size ISS particles presented in the grit chamber were important factors influencing grit removal efficiency. Pressure gradient and turbulence intensity distributions simulated by the three turbulence models were significantly different. Particles with diverse sizes reacted distinctly to the disturbance effect caused by pressure difference, which impacted on the accuracy and reliability of simulation results.
journal_name
Environ Technoljournal_title
Environmental technologyauthors
Lu Z,Yu L,Xu X,Ji F,Liu Cdoi
10.1080/09593330.2017.1375025subject
Has Abstractpub_date
2018-12-01 00:00:00pages
3181-3192issue
24eissn
0959-3330issn
1479-487Xjournal_volume
39pub_type
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