Cfd study of cstr
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1) The document outlines a CFD study of different impellers - PBTD, PBTU, and Rushton turbine - in a continuous stirred tank reactor (CSTR) with and without baffles. 2) Mixing times and residence time distributions were calculated using a tracer injection method and concentration probes. 3) The PBTD impeller with baffles achieved the shortest mixing time of 6.0975 seconds, while the PBTD without baffles had the longest mixing time of 10.84 seconds.
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- 1. JUSTIN K GEORGE 17202261 PhD -Chemical Engineering IIT Kanpur
- 2. Outline • Introduction • Specifications of Geometry • PBTD45W50-4, Without Baffle STR • PBTD45W50-4, With Baffle STR • PBTU45W50-4, With Baffle STR • RUSHTON TURBINE, STR • MIXING TIME • RTD • Conclusion
- 3. Introduction CFD - Computational Fluid Dynamics (ANSYS Fluent) CFD is the art of replacing PDE systems by a set of algebraic equations Modelling & simulation of the CSTR system Flow study & Mixing Time calculation with different Impellers by MRF model PBTD45W50-4 [with & without Baffle] PBTU45W50-4 RUSHTON TURINE RTD Calculation Steps involved 1).Pre-processing 2). Solver 3). Post processing
- 4. • Liquid = Water • Impeller Speed= 468.6rpm or 7.81rps Specifications of Geometry Parameters Values Tank diameter, T Impeller diameter, D Clearance, C Height of liquid, H Number of blades ; PBTD,PBTU Rushton Turbine 0.5 m 0.17 m 0.165 m 0.5 m 4 , Angle 45° 6 The general conservation of mass or continuity, The Navier Stokes equations, The species transport equation. (for non-reacting mixture) GOVERNING EQUATIONS PBTD/PBTU RUSHTON TURBINE
- 5. PBTD45W50-4, Without Baffle STR
- 6. PBTD45W50-4, With Baffle STR
- 7. PBTU45W50-4, With Baffle STR
- 9. MIXING TIME Volume of the tracer = 0.1L (0.0001 m^3) Volume of the CSTR =0.097596 m^3 Final concentration of the tracer= 0.001025~0.001 Location of the tracer injection=(0.12,0.12,0.47) * Conductive Probes (concentration measure) Fig: Tracer & Probes locations Fig: Example of Probe’s results IMPELLER CONCENTRA TION MIXING TIME PBTD 0.001 6.175 Sec PBTU 0.00106 6.0975 Sec PBTD (WOB) 0.00095 10.84 Sec RUSHTON 0.00106 9.23 Sec
- 10. RTD 0 0.2 0.4 0.6 0.8 1 1.2 0 2000 4000 6000 8000 F(t) t (s) 0 0.0001 0.0002 0.0003 0.0004 0.0005 0.0006 0.0007 0.0008 0 2000 4000 6000 8000 E(t) t (s) 0 2 4 6 8 10 12 0 5000 10000 Massweightedaveragescalar value Flow time (s) tm=1406 Sec [ from Results] V= 0.098023 m^3 ; Q= 7.58E-05*1=7.58E-05m^3/s V/Q = 1292.668 Sec
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