Interfaces with Mass Transfer
In the group and laboratory of Interfaces of Mass Transfer (SIM) processes with intense transport of heat and mass across interfaces are studied. The approach is based on dedicated experiments that are analyzed with analytical and with numerical models. Most research is in collaboration with industrial partners that utilize these complex physical-chemical processes, but our research is aimed at a good understanding of the underlying mechanisms and a proper mathematical description.
SIM started in 2016 at the department of Chemical Engineering and Chemistry (ST) but elaborates on and continues research that has been performed at Mechanical Engineering (W) for quite some time now. Typical examples are the growth and detachment of boiling or electrolysis bubbles; quench cooling; pulsed electric fields; flow distributions; novel ways to fully vaporize expensive compounds without waste or fouling; development and study of heterogeneous, patterned substrates and responsive coatings to promote drainage in dropwise condensation.
Currently, the group participates in the following NWO-TTW and FOM projects:
Project NWO-TTW 12386; “Boiling Flow Regime Maps for Safe Designing”. The intended main results of this project are twofold: (1) flow pattern maps for heated two-phase flows of water-steam and (2) a multi-scale numerical method to determine such flow pattern maps which is validated for the measurement conditions for which these maps have been established. Cooperation: Stork Thermeq, NEM, NRG, DAF Trucks, Essent.
Project NWO-TTW 13781; “Contactless and contactful boiling for controlled evaporation”. By a combined experimental and numerical study it will be investigated how problems related to fouling, process reliability and flow instability in the miniaturization of evaporators can be avoided by changing the contact area between liquid and solid. The project is aimed and enhancing our understanding of controlled evaporation and at developing an engineering simulation model for use at practical scales. Cooperation: TNO, Bronkhorst, ASM, PMI, Océ, TetraPak, Shell, AkzoNobel.
Project FOM 15HTM05/F41.5.14525; “Explaining boiling beyond the boiling temperature”. We have realized a strategy to facilitate direct visual observations of complex boiling phenomena during quench cooling of hot steel plates. With these observations degassing, boiling and rewetting phenomena on stationary plates have been directly measured for the first time. In the current project it will be attempted to move the test plate during the process. The aim is an improved understanding of heat transfer through developing two-phase boundary layers. Collaboration: Tata Steel, M2i.