Original Paper
DOI : https://doi.org/10.4491/KSEE.2016.38.1.25

J Korean Soc Environ Eng. 2016; 38(1): 25-33.

Published online 2016 January 31.

doi: https://doi.org/10.4491/KSEE.2016.38.1.25

CFD Simulation of the Effects of Inlet Flow rate on Hydraulic Behavior in Continuous Stirred-Tank Reactor (CSTR)

Young Joo Lee¹, Jeong Ik Oh², Sukmin Yoon³, Jong-Oh Kim³, and No-Suk Park³

¹K-water Institute
²LH Institute
³Division of Architectural, Urban and Civil Engineering and Engineering Research Institute, Gyeongsang National University

Corresponding Author: Email: nspark@gnu.ac.kr

Received 2016 January 12;    Accepted 2016 January 25.

This paper describes three-dimensional computational fluid dynamics (CFD) simulation of liquid-liquid flow and transient tracer tests in a full-scale continuous stirred-tank reactor (CSTR) used for drinking water treatment. To evaluate the effects of inlet flow rate on hydrodynamic behavior in the selected CSTR, inlet flow rate was changed from 10% to 100% of the design flow rate. From the results of CFD simulation and analysis, as the inlet flow rate increases, Modal index and β value are increased. Also, Morrill index shows local minimal points in relation to the inlet flow rate, which are observed at 20% and 40% of the design flow. As inlet flow Increases more than 40%, it is shown that Morrill index re-increases to close to ideal CSTR.

Keywords : Computational Fluid Dynamics (CFD), Hydraulic Behavior, Continuous Stirred-tank Reactor (CSTR), Inlet Flow Rate, Morrill Index