{"id":247,"date":"2026-06-01T10:00:00","date_gmt":"2026-06-01T10:00:00","guid":{"rendered":"https:\/\/www.auriga.polimi.it\/?p=247"},"modified":"2026-09-09T15:54:00","modified_gmt":"2026-09-09T15:54:00","slug":"hessenkemper-visit","status":"publish","type":"post","link":"https:\/\/www.auriga.polimi.it\/index.php\/hessenkemper-visit\/","title":{"rendered":"Dr. Hessenkemper’s visiting period"},"content":{"rendered":"\n

On the 4th of February Dr. Hessenkemper started a three week visiting period to share his expertise on experimental techniques for bubble-image analysis and give a seminar on AI methods for optical multiphase-flow experiments.<\/p>\n\n\n\n

\"The
The seminar on AI methods for optical multiphase-flow experiments, at the Department of Energy.<\/figcaption><\/figure>\n\n\n\n
\"Dr.
Dr. Hessenkemper with the AURIGA group after the seminar.<\/figcaption><\/figure>\n\n\n\n

Why the technique matters here<\/h2>\n\n\n\n

Particle Shadow Velocimetry is a direct in-line illumination method: the bubbles and the tracer particles are back-lit and recorded as shadows, so the liquid velocity field around<\/em> a bubble and the motion of the bubble itself come out of the same set of images. For AURIGA this is the key measurement of the bubble-scale work package \u2014 the lift force acting on a rising bubble cannot be obtained from the trajectory alone, but only from a lateral force balance that needs the surrounding liquid velocity as an input.<\/p>\n\n\n\n

The seminar dealt with the AI methods that make the technique workable in dense conditions: automated detection, segmentation of overlapping bubbles and tracking across frames, which is what turns a high-speed recording into bubble size, shape and velocity statistics rather than a set of pictures. The discussion covered how to transfer the approach to the aqueous ionic-liquid solutions used in the project, where interfacial mobility differs from pure water and changes both the bubble shapes and the sign of the lift force.<\/p>\n\n\n\n

The collaboration has continued since: Dr. Hessenkemper is a co-author on the single-bubble poster awarded at CHISA 2026, and the approach underlies the lift-force campaign carried out at HZDR.<\/p>\n\n","protected":false},"excerpt":{"rendered":"

On the 4th of February Dr. Hessenkemper started a three week visiting period to share his expertise on experimental techniques for bubble-image analysis and give a seminar on AI methods for optical multiphase-flow experiments. Why the technique matters here Particle Shadow Velocimetry is a direct in-line illumination method: the bubbles and the tracer particles are […]<\/p>\n","protected":false},"author":1,"featured_media":244,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-247","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/www.auriga.polimi.it\/index.php\/wp-json\/wp\/v2\/posts\/247","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.auriga.polimi.it\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.auriga.polimi.it\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.auriga.polimi.it\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.auriga.polimi.it\/index.php\/wp-json\/wp\/v2\/comments?post=247"}],"version-history":[{"count":4,"href":"https:\/\/www.auriga.polimi.it\/index.php\/wp-json\/wp\/v2\/posts\/247\/revisions"}],"predecessor-version":[{"id":426,"href":"https:\/\/www.auriga.polimi.it\/index.php\/wp-json\/wp\/v2\/posts\/247\/revisions\/426"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.auriga.polimi.it\/index.php\/wp-json\/wp\/v2\/media\/244"}],"wp:attachment":[{"href":"https:\/\/www.auriga.polimi.it\/index.php\/wp-json\/wp\/v2\/media?parent=247"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.auriga.polimi.it\/index.php\/wp-json\/wp\/v2\/categories?post=247"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.auriga.polimi.it\/index.php\/wp-json\/wp\/v2\/tags?post=247"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}