DFG funds new research on falling liquid films

First successful application for a DFG project on dripping in falling liquid films!!

Falling liquid films are of technical relevance in a multitude of applications in energy and process engineering. The relevant literature offers a comprehensive overview of film evolution and film transfer properties on inclined or vertical walls and differing surface geometries. Experimental and numerical data of films underneath an inclined plane are very scarce, despite their importance in e.g. coating problems or structured packings
in chemical engineering. In these applications, the prevention of dripping to ensure homogeneous coatings or the promotion of dripping to increase liquid/gas interface areas is of high interest. Due to the non-linear character of dripping from films beneath surfaces, an analytical approach to the problem is difficult and correlations for the onset of dripping and a quantification of dripping mass flows are not available at present. Within the proposed project, the dripping regime in films flowing beneath basic surface geometries is analyzed through fully resolved numerical simulation, low-dimensional modeling and experimental investigations. The aim is to provide physically motivated correlations for the onset of dripping and to quantify dripping mass flows and specific surface areas to enable a targeted design of respective processes.

New version of HeatQuiz

We have released the next Version of HeatQuiz for Android. The new version has a new design. But more important, new game modes are available to practise methods in radiative heat transfer. New information on the App are also available on the web site www.heatquiz.app.

TV contribution: What is the reason for noise in water boiling?

Hello,

Boiling water happens every day in the kitchen. But have you ever questioned why there is so much noise generated before the water actually boils?

A little TV contribution for kids-TV (KIKA) will be shown on the 15.02 at 19:25 presenting our experimental videos of bubble growth and collapse during boiling.

Here is a link to the german page.

Best,
Wilko

The HeatQuiz development continues (Fellowship for Digital Teaching)

The development of the HeatQuiz is now supported the the „Fellowship for digital teaching“ of the NRW-Stifterverband. With a financial volume of 50,000€ we are able to bring the teaching game to a new level.

In addition, we are proud to present the APP now also for iOS. It took some time to get it running but now it works!!

The following links direct you to the APP

Google Playstore

App Store for iOS

Best, Wilko

Current research covers the title page of JFM

We have good news,

an image of our recent article „Dynamics of falling films on the outside of a vertical rotating cylinder: waves, rivulets and dripping transitions“ by Rietz, M., Scheid, B., Gallaire, F., Kofman, N., Kneer, R., Rohlfs, W. has been chosen for the front cover in JFM.

The link shows the cover of the volume 832!!

Journal of Fluid Mechanics Volume 832 - Issue -

Best,

Wilko