Using STAR-CCM+ for Research and Teaching at the Chair of Chemical - - PowerPoint PPT Presentation

▶
using star ccm for research and teaching at the chair of
SMART_READER_LITE
LIVE PREVIEW

Using STAR-CCM+ for Research and Teaching at the Chair of Chemical - - PowerPoint PPT Presentation

Apr 08, 2023 346 likes •616 views

Using STAR-CCM+ for Research and Teaching at the Chair of Chemical & Process Engineering P ROF . D R .-I NG . M. K RAUME , G. W EHINGER , T. E PPINGER Chair of Chemical & Process Engineering Technische Universitt Berlin STAR Global

slide-1
SLIDE 1

Using STAR-CCM+ for Research and Teaching at the Chair of Chemical & Process Engineering

  • PROF. DR.-ING. M. KRAUME, G. WEHINGER, T. EPPINGER

Chair of Chemical & Process Engineering Technische Universität Berlin STAR Global Conference 2014 (March 17-19), Vienna

slide-2
SLIDE 2

Slide 2

Chair of Chemical & Process Engineering

  • www. verfahrenstechnik.tu-berlin.de

STAR Global Conference 2014 Vienna, March 17-19, 2014

Content 1. Introducing the chair of chemical & process engineering at TU Berlin 2. Single-phase research 3. Multi-phase research 4. Teaching CFD

slide-3
SLIDE 3

Slide 3

Chair of Chemical & Process Engineering

  • www. verfahrenstechnik.tu-berlin.de

STAR Global Conference 2014 Vienna, March 17-19, 2014

TU Berlin – Chair of chemical & process engineering

slide-4
SLIDE 4

Slide 4

Chair of Chemical & Process Engineering

  • www. verfahrenstechnik.tu-berlin.de

STAR Global Conference 2014 Vienna, March 17-19, 2014

SINGLE-PHASE RESEARCH

slide-5
SLIDE 5

Slide 5

Chair of Chemical & Process Engineering

  • www. verfahrenstechnik.tu-berlin.de

STAR Global Conference 2014 Vienna, March 17-19, 2014

Single-phase stirrer vessels

  • Enzymatic membrane reactor

 70 mm x 40 mm  90 mL Volume  H/D ≈ 1,8  Stirrer with d/D ≈ 0,9  Membrane at bottom

  • Single-phase CFD simulations:

– Membrane fouling characteristics – Stirrer momentum – Mixing time

Lyagin et al. (2012). Chemical Engineering, 27

Temperature control pH control Adapter Inlet Stirrer Membrane Outlet Shaft

slide-6
SLIDE 6

Slide 6

Chair of Chemical & Process Engineering

  • www. verfahrenstechnik.tu-berlin.de

STAR Global Conference 2014 Vienna, March 17-19, 2014

Membrane fouling and shear stress

Enzyme: Acylase from Aspergillus Melleus

Shear stress [PA]

Lyagin et al. (2012) Procedia Engineering, 44, 391-393.

slide-7
SLIDE 7

Slide 7

Chair of Chemical & Process Engineering

  • www. verfahrenstechnik.tu-berlin.de

STAR Global Conference 2014 Vienna, March 17-19, 2014

DEM (discrete element method) Generation of a random packing CFD - STAR-CCM+ Calculation of fluid dynamics, temperature and species concentration Pore model Calculation of processes within pores

Spatially Resolved Simulation of Fixed-Bed Reactors

DARS Calculation of detailed homogeneous and heterogeneous reaction mechanism

Spatially resolved catalytic fixed-bed reactors

slide-8
SLIDE 8

Slide 8

Chair of Chemical & Process Engineering

  • www. verfahrenstechnik.tu-berlin.de

STAR Global Conference 2014 Vienna, March 17-19, 2014

Fixed bed generation using DEM simulations

Spherical particles Non-spherical particles

Filling by DEM-simulation  Fixed-bed geometry  Meshing  CFD simulation

Eppinger et al. (2011). Chemical Engineering Journal, 166(1), 324-331.

slide-9
SLIDE 9

Slide 9

Chair of Chemical & Process Engineering

  • www. verfahrenstechnik.tu-berlin.de

STAR Global Conference 2014 Vienna, March 17-19, 2014

Work flow – non-spherical particles

D/d = 8.8 D = 0.22m d = h = 0.025m H = 0.55m

Cylinders Raschig rings

  • ne hole

Raschig rings four hole

slide-10
SLIDE 10

Slide 10

Chair of Chemical & Process Engineering

  • www. verfahrenstechnik.tu-berlin.de

STAR Global Conference 2014 Vienna, March 17-19, 2014

Catalytic fixed-bed reactors

Coupling spatially complex geometries with detailed surface reactions Heterogeneous dry reforming of methane (42 irreversible reactions) 𝑆𝑓𝑞 =

𝑤 𝑒𝑞 𝜉 = 28, Twall = 700 °C

See the presentation by Gregor Wehinger: “Spatially Resolved Simulations of Heterogeneous Dry Reforming of Methane in Fixed-Bed Reactors” from 2:00 pm to 2:25 pm, Klimt I.

slide-11
SLIDE 11

Slide 11

Chair of Chemical & Process Engineering

  • www. verfahrenstechnik.tu-berlin.de

STAR Global Conference 2014 Vienna, March 17-19, 2014

Mixing in biogas plants

Requirement: Correspondence of the agitators Challenges:

  • Shear thinning and viscoelastic fluids
  • multi-phase systems: solid, liquid

and gaseous Biogas plant: substrate: corn silage 2 submersible mixers volume: 2500m³ S = 39 [Pa∙s0.12] ∙  (0.12-1) 0 = 1000 Pa∙s ∞ = 0.34 Pa∙s

slide-12
SLIDE 12

Slide 12

Chair of Chemical & Process Engineering

  • www. verfahrenstechnik.tu-berlin.de

STAR Global Conference 2014 Vienna, March 17-19, 2014

Mixing in biogas plants

2.40 1.92 1.44 0.96 0.48 0.00 Cavern forming in high viscous, shear thinning fluids  the correspondence of the agitators breaks down

slide-13
SLIDE 13

Slide 13

Chair of Chemical & Process Engineering

  • www. verfahrenstechnik.tu-berlin.de

STAR Global Conference 2014 Vienna, March 17-19, 2014

Permeation through a semipermeable membrane

Feed Retentate Permeate Membrane

Feed side: cF

(x,y,z)

Mass transfer as concentration dependent boundary condition Permeate side: cP(x,y,z)

 Implementation as user function

𝑵

𝑵 For each component i: 𝑵 𝒋 𝒚, 𝒜 = 𝑴 𝑩 𝒅𝒋

𝑮 − 𝒅𝒋 𝑸 𝒚,𝒜,𝒛=𝟏

Mass flow Permeance Concentration difference between feed and permeate side on membrane surface Area

slide-14
SLIDE 14

Slide 14

Chair of Chemical & Process Engineering

  • www. verfahrenstechnik.tu-berlin.de

STAR Global Conference 2014 Vienna, March 17-19, 2014

Application Details

Gas permeation test cell Input Parameters

  • Methane and n-butane mixture
  • pFeed, pPerm, 𝑊 𝐺𝑓𝑓𝑒
  • Permeance L of membrane material
  • Trimmed Mesh

Cross section Fluid volume Mesh

slide-15
SLIDE 15

Slide 15

Chair of Chemical & Process Engineering

  • www. verfahrenstechnik.tu-berlin.de

STAR Global Conference 2014 Vienna, March 17-19, 2014

Results

Velocity profile Concentration profile Transmembrane mass transfer of n-butane:

  • 6,3*10-5 kg/m² s bar
  • 6,6*10-5 kg/m² s bar
slide-16
SLIDE 16

Slide 16

Chair of Chemical & Process Engineering

  • www. verfahrenstechnik.tu-berlin.de

STAR Global Conference 2014 Vienna, March 17-19, 2014

MULTI-PHASE RESEARCH

slide-17
SLIDE 17

Slide 17

Chair of Chemical & Process Engineering

  • www. verfahrenstechnik.tu-berlin.de

STAR Global Conference 2014 Vienna, March 17-19, 2014

Multi-phase slim stirrer reactors

  • Combining CFD simulations and population balance equation
  • drop size and power consumption
slide-18
SLIDE 18

Slide 18

Chair of Chemical & Process Engineering

  • www. verfahrenstechnik.tu-berlin.de

STAR Global Conference 2014 Vienna, March 17-19, 2014

Power number and Sauter mean diameter

slide-19
SLIDE 19

Slide 19

Chair of Chemical & Process Engineering

  • www. verfahrenstechnik.tu-berlin.de

STAR Global Conference 2014 Vienna, March 17-19, 2014

VOF-simulation of a silicon oil liquid film

20cm 28 cm 0 cm 4 cm  Film with constant height  Regular beads  Irregular beads due to coalescence  Fewer but higher and faster beads

Wehinger et al. Chemical Engineering Science 104 (2013): 934-944.

slide-20
SLIDE 20

Slide 20

Chair of Chemical & Process Engineering

  • www. verfahrenstechnik.tu-berlin.de

STAR Global Conference 2014 Vienna, March 17-19, 2014

Mass transfer at vertical liquid film

Specific interfacial area depending on gas load Mean gas-side Sherwood number depending on Reynolds number

slide-21
SLIDE 21

Slide 21

Chair of Chemical & Process Engineering

  • www. verfahrenstechnik.tu-berlin.de

STAR Global Conference 2014 Vienna, March 17-19, 2014

TEACHING CFD

slide-22
SLIDE 22

Slide 22

Chair of Chemical & Process Engineering

  • www. verfahrenstechnik.tu-berlin.de

STAR Global Conference 2014 Vienna, March 17-19, 2014

Teaching

  • Students are CFD users, not programmers
  • Theory: as much as necessary
  • Focus: solving engineering problems
  • Advantages of STAR-CCM+:

CAD modeler Post- processing GUI

mostly simple geometries Hierarchical model selection Reports, Monitors, Animations CAD

slide-23
SLIDE 23

Slide 23

Chair of Chemical & Process Engineering

  • www. verfahrenstechnik.tu-berlin.de

STAR Global Conference 2014 Vienna, March 17-19, 2014

Example: Hippopotamus pool in the zoo of Berlin

Simplified geometric model

  • Three hippopotami in the pool
  • Water turbidity in the pool due to biomass disposal
  • Pool: 600 m³ and 160 m³/h

 Velocity distribution and residence time

slide-24
SLIDE 24

Slide 24

Chair of Chemical & Process Engineering

  • www. verfahrenstechnik.tu-berlin.de

STAR Global Conference 2014 Vienna, March 17-19, 2014

Water turbidity by evaluating velocities

Velocity distribution at different levels in the hippopotamus pool  Dead zones indicates water turbidity Velocity inlet Pressure outlets

slide-25
SLIDE 25

Slide 25

Chair of Chemical & Process Engineering

  • www. verfahrenstechnik.tu-berlin.de

STAR Global Conference 2014 Vienna, March 17-19, 2014

Conclusion

  • We are applying computational fluid dynamics regularly.
  • Special objections need special solutions, e.g., user defined

subroutines.

  • CFD accompanies and/or enriches specific experiments at different

length and time scales.

  • CFD references and is likewise referenced by experiments.
slide-26
SLIDE 26

Thank you for your attention.

  • Prof. Dr.-Ing. M. Kraume, G. Wehinger, T. Eppinger

Chair of Chemical & Process Engineering Technische Universität Berlin STAR Global Conference 2014 (March 17-19), Vienna