VisiMix is a software that allow chemical engineer, process engineers , Design engineers, R& D engineers to visualize mixing process by these software.Our goal is to develop a process that will run properly in first trial on new scale or site. Similar to our successful results in the lab. The main parameters we change are the hydrodynamics of the system. If we are able to identify and control these parameters we will be able to achieve the available and optimal solution

1. BANSILAL RAMNATH AGARWAL CHARITABLE TRUST'S
VISHWAKARMA INSTITUTE OF TECHNOLOGY
Name Of Student: Rucha Lokhande
Isha Mesharam
Prajkta Kulal
Rucha Dhavale
Course Project Topic: Calculation Of Power, Shear & Gas
Holdup In A Reactors For Fermentation
Name Of Subject: Advance Reaction Engineering
Under Guidance Of Dr. Manik Deosakar

2. CONTENTS
✔ Introduction
✔ Problem Definition
✔ Demonstration
✔ Results & Conclusion

3. INTRODUCTION
◼ VisiMix is a software that allow chemical engineer, process engineers ,
Design engineers, R& D engineers to visualize mixing process by these
software.
◼ It is first and only tool in industry used for simulation of Stirred reactors.
◼ It is also allows mathematical modeling and calculation for all types of
impeller.
◼ User friendly and easily accessible.

4. COMPANIES AND MARKETS
Visimix product has been used by more
that 200 customers for more than 10years.
And 80% companies has renewed there
contracts

5. GOALS:
◼ Our goal is to develop a process that will run properly in first
trial on new scale or site. Similar to our successful results in the
lab.
◼ The main parameters we change are the hydrodynamics of the
system. If we are able to identify and control these parameters
we will be able to achieve the available and optimal solution

6. FEATURES
◼ VisiMix lets you display the drawing of tanks , impeller, baffles and the and the
tables of property for the calculations.
◼ You can change any data at any
calculation stage.
◼ It display several output windows
at ones and can generate report
by comparing calculated
parameters for different sets.

7. FEATURES
◼ It also includes few mathematical models which includes
o Hydrodynamic modeling.
o Calculation of circumference flowrate.
o Calculation of distribution of particles along the vertical axis and the
radius of tank.
o Calculate local turbulence close to the tank bottom , etc

8. VISIMIX HELPS:
◼ Production plant engineer to check applicability of equipment for new
plant process.
◼ Designer engineers for the technical calculation and also for preparing
the initial data ordering the equipment.
◼ Control engineer to simulate transition regimes. And also define
representative position of sensor.
◼ R& D engineer prepare the initial data for selecting and designing
production scale mixing equipment.

9. DEFINING PROBLEM
◼ Calculation of Power, Shear and Gas-liquid mass
transfer, macro mixing in reactors for fermentation.
with identical air injection parameters
◼ Two different mixing devices – propeller disc
turbine

10. HYDRODYNAMIC MODELING
◼Study of fluids in motion.
◼Forces are generated
◼Affects the behavior of the fluid.
◼A wide range of sectors.

11. TURBULENCE MODELING
◼ Predict the effects of turbulence.
◼ Predict the evolution of these turbulent flows.
◼ Simple cases of flow.
◼ Predict the statistical evolution
of turbulent flows.

12. GAS DISPERSION AND MASS TRANSFER MODELING
◼ Suspension of bubbles of gas in an immiscible liquid.
◼ A gas dispersion is usually produced in order to enhance mass transfer.
◼ High shear mixing devices that impart a high level of turbulent energy to
the system.
◼ Energy appears as turbulence.
◼ Surface area interface between the gas and the liquid.
◼ Increase in the biofilm size.

13. PARAMETERS CALCULATED
◼ Mixing power;
◼ Oxygen mass transfer rate;
◼ Maximum local shear stress;
◼ Relative residence time of suspension in zones of
the maximum shear stress.
◼ Macro mixing

14. DESCRIPTION OF EQUIPMENT
◼ Design characteristics and main dimensions of the
equipment
◼ Tank: Jacketed tank with elliptical bottom.
◼ Baffles: 4-flat radial baffles.
◼ Propeller
◼ TURBINE: disc turbine.

15. SCHEMATIC DIAGRAM

16. VISIMIX & ITS REQUIREMETS
Whether one is process chemist, an engineer ,or a technician VisiMix works with one at their
level of expertise.
As input, we need only a set of initial data available :
a] Type and dimensions of mixing system
b] Properties of media
If we don’t know the exact values, VisiMix helps to estimate them

17. STEPS
Create VisiMix
project for the
process
Select Project >
New in the main
VisiMix menu
Enter the name
for project and
save it in any
convenient
directory
The tank menu
appears & based on
the requirement or
question proceed
further

18. Model selection

19. specifications

21. DEMONSTRATION

22. KEY PARAMETERS
◼ Micro mixing - micro mixing is a process in which ingredient
particles rearrange to form a blend.
◼ Gas holdup - it is the volume fraction of gas in the total volume
of gas–liquid phase in reactor
◼ Residence time – average time of molecular which is spend in reactor
◼ Turbulent shear - rate of transport of momentum by turbulent
motions is equivalent to a shear stress across the plane.

23. SINGLE PHASE MIXING , MAIN CHARACTERISTICS
◼Micromixing time – 31.0 s
◼Main period of circulation - 6.63 s
◼Characteristics time of micromixing - 23.5 s
◼Gas hold up – 0.194

24. RECIDANCE TIME ZONE WITH DIFFERENT TURBULENCE
•Relative residence time zone of maximum
dispersion - 0.00172
•Relative residence time zone of baffle – 0.0163
•Relative residence time zone in the bulk volum -
0.879

25. TURBINE SHEAR RATE IN DIFFERENT RATE
◼Turbine shear rate impeller blade - 2820
◼Turbine shear rate near the baffle – 137
◼Turbine shear rate bulk volume - 90.8
◼Unit = 1/sec
◼Mixing power – 1160 W

26. PROPELLER’S EFFECT
◼ It Will increase the homogeneity.
◼ It Can be used in two different patterns for drying and
pressing.
◼ Need to be operated at high speed to avoid solid settlings
in reactors.
◼ Need to be operated at low speeds in drying operations.

27. CONCLUSION
◼ Visimix is working well. The several parameters, such as power
consumption, average time of circulation, mass transfer rate, heat
transfer rate, etc. VisiMix allows for the calculation of all these
values for major designs of tanks and impellers with respect to
actual sizes and positions of impeller blades and baffles.
◼ Propeller, the angle of blade varies from 30 degrees (for less viscous
liquids) to 90 degrees (for more viscous liquids). Standard angle is 45
degrees. Power requirement increases with higher pitch angle.

28. Thank you