The lab course takes place only in the summer semester as a two-week compact internship during the lecture-free period.
The number of participants is limited.
If you are interested, please register on the ISIS page. "Registration for (lab) courses with limited participation". Three weeks before the start of the respective course, the lists are sent to the examination office and the participants are informed.
They must then register promptly at the Examinations Office and hand in the registration form at the secretary's office. The registration is then binding. If the registration is not handed in on time, the claim will be forfeited and the place will be given to students on the list of latecomers.
The experiments of the lab course build on the contents of the course "Process Engineering II". Attendance of this course is therefore desirable. The basics are already taught in the course "Process Engineering I", so it is obligatory to attend this course.
Experiments on gas dispersion, coalescence and solids suspension are carried out in an optically accessible stirred tank (DN 400).
Different stirrer types (disc and inclined blade stirrers) are compared with each other and evaluated with respect to their dispersing and suspending properties
Dispersion of a gas
Determination of the flooding point
Comparison of slanted-blade stirrers with disk stirrers
Influence of ionic strength on the coalescence behavior of gas bubbles
Comparison of inclined blade stirrer with disk stirrer
Suspension of a solid
90% layer height criterion
A scale-up from laboratory to pilot plant scale is to be performed. The overriding task is to predict the expected power consumption at the pilot plant scale. This is complicated by the fact that the fluid under consideration is a non-Newtonian medium, where the viscosity depends on the shear rate. Three different methods from the literature will be tested and evaluated with respect to their suitability for scaling up non-Newtonian fluids.
Concept of the effective shear rate according to Wassmer
(3) Fluidized bed
Glass particles are fluidized and held in suspension by water flowing through the layer from below at a certain empty tube velocity. Pressure nozzles allow pressure loss measurement.
Pressure loss measurement
Pressure loss profiles
Experimental and theoretical determination of loosening and swarm sinking velocity
(4) Packed column
The packed column represents a two-phase system of water and air. Water is added through a distributor at the top of the column. Air flows from the bottom of the column through the packed bed. Above a certain gas load, the column is flooded, i.e. the water is dammed up to such an extent that it emerges at the top of the column. The column has then reached its operating limit.
Determination of the degree of gap
Pressure drop at different gas loads
Dry and wet pressure drop
Liquid filling number
Stagnation and flooding point determination
(5) Bubble column
The bubble column is operated in co-current. Gas, in this case air, is added at the bottom of the column and represents the disperse phase. Water is the continuous phase. During operation, due to the density difference, circulation cells are formed, which provide for a strong mixing. Measuring points along the column allow sampling and pressure measurements. A tracer substance can also be added at the head, which allows conclusions to be drawn about the dispersion coefficient.
Determination of the gas content
Calculation of the dispersion coefficient