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Chemical Engineering

  • Thermal Decomposition of a Chemical through a Parallel Plate Reactor Thermal Decomposition of a Chemical through a Parallel Plate Reactor This model investigates the unimolecular decomposition of a chemical passing through a parallel plate reactor. The heat sensitive compound is present in a water solution. After entering the reactor, the liquid first experiences expansion, due to a step-change in geometry at the bottom plate. Befo...
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  • Fluid-Structure Interaction in Aluminum Extrusion Fluid-Structure Interaction in Aluminum Extrusion In massive forming processes like rolling or extrusion, metal alloys are deformed in a hot solid state with material flowing under ideally plastic conditions. Such processes can be simulated effectively using computational fluid dynamics, where the material is considered as a fluid with a very high...
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  • A Transient Analysis of Freeze-drying A Transient Analysis of Freeze-drying Freeze-drying, or lyophilization, is a process for drying heat-sensitive substances such as foods, blood plasma, and antibiotics. The wet substance is frozen and then through sublimation ice or some other frozen solvent is removed in the presence of a high vacuum. This example models the process...
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  • Droplet Breakup in a T-junction Droplet Breakup in a T-junction Emulsions consist of small liquid droplets immersed in an immiscible liquid and widely occur in the production of food, cosmetics, fine chemicals, and pharmaceutical products. The quality of the product is typically dependent on the size of the droplets. Simulating these processes can help in optimi...
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  • Polymerization in a Multijet Tubular Reactor Polymerization in a Multijet Tubular Reactor This example considers condensation polymerization in a tubular reactor, where mixing in the reactor is achieved by impinging turbulent jets of reactants onto each other. Turbulent flows involving rapid reaction kinetics are quite common in the production of polymers, and the complex interplay b...
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  • Hydrocarbon Dehalogenation in a Tortuous Microreactor Hydrocarbon Dehalogenation in a Tortuous Microreactor Removing halogen groups from hydrocarbons is an important reaction step in several chemical processes. One application is water purification. Other examples involve organic synthesis, where the removal of halogen groups serves as a starting point for carbon-carbon coupling reactions. Typically, the...
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  • Nonisothermal Flow in a MEMS Heat Exchanger Nonisothermal Flow in a MEMS Heat Exchanger This example concerns a stainless-steel MEMS heat exchanger, which you can find in lab-on-a-chip devices in biotechnology. Fluid flows through the tubes while a stainless steel heat sink/source surrounds the tubes. The heat exchanger is modeled in 3D and accounts for heat transfer through both co...
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  • Turbulent Residence Time Turbulent Residence Time Large-scale reactors are usually made from stationary parts, often involving baffles. They make use of the baffled- imposed turbulence to provide mixing within the reactor. Yet, such reactors need to be optimized as too much baffling can create unnecessary turbulence and pressure drops. Too few can...
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  • Electroosmotic Flow in a Biochip Electroosmotic Flow in a Biochip Miniature laboratories are required to efficiently analyze the information in human DNA. Such laboratories could facilitate tailor-made diagnoses and treatment of hereditary diseases for each individual. One problem that arises in these lab-on-a-chip devices lies in the transport of the liquid s...
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  • Steam Reformer Steam Reformer In fuel cell power generators, a steam reformer unit typically produces the hydrogen needed for the cell stack. This example illustrates the modeling of a steam reformer. The reformation chemistry occurs in a porous catalytic bed where energy is supplied through heating tubes to drive the endothe...
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