{"id":479,"date":"2026-09-29T13:05:02","date_gmt":"2026-09-29T13:05:02","guid":{"rendered":"https:\/\/www.auriga.polimi.it\/index.php\/lab\/circular-bubble-swarm-column\/"},"modified":"2026-10-19T11:43:22","modified_gmt":"2026-10-19T11:43:22","slug":"circular-bubble-swarm-column","status":"publish","type":"page","link":"https:\/\/www.auriga.polimi.it\/index.php\/lab\/circular-bubble-swarm-column\/","title":{"rendered":"Circular bubble-swarm column"},"content":{"rendered":"\n<p class=\"is-style-eyebrow wp-block-paragraph\">Small scale \u00b7 Work package b and c<\/p>\n\n\n\n<div class=\"wp-block-group facility-flow\"><div class=\"wp-block-group__inner-container is-layout-flow wp-block-group-is-layout-flow\">\n<figure class=\"wp-block-image size-full rig-drawing\"><img loading=\"lazy\" decoding=\"async\" width=\"108\" height=\"812\" src=\"https:\/\/www.auriga.polimi.it\/wp-content\/uploads\/2026\/09\/rig-swarm-cylindrical.png\" alt=\"CAD elevation of the cylindrical bubble-swarm column\" class=\"wp-image-344\" srcset=\"https:\/\/www.auriga.polimi.it\/wp-content\/uploads\/2026\/09\/rig-swarm-cylindrical.png 108w, https:\/\/www.auriga.polimi.it\/wp-content\/uploads\/2026\/09\/rig-swarm-cylindrical-40x300.png 40w\" sizes=\"auto, (max-width: 108px) 100vw, 108px\" \/><\/figure>\n\n\n\n<p class=\"is-style-lede wp-block-paragraph\">A transparent cylindrical bubble column with a total height of approximately 2 m, designed for column-scale characterization of gas holdup under different operating conditions (different superficial velocities and three different spargers). Gas holdup is determined from differential hydrostatic pressure measurements using relative pressure transducers connected to five pressure ports distributed along the column height. The arrangement allows the pressure difference, and therefore the average gas holdup, to be evaluated over four separate axial sections, providing information on the spatial evolution of the gas fraction along the column.<\/p>\n\n\n\n<p class=\"is-style-prose wp-block-paragraph\">The facility is intended to characterize the global and axial fluid dynamic behaviour of gas\u2013liquid flows, with particular focus on the effect of operating conditions and liquid properties on gas holdup. In addition to the pressure measurement system, the column includes three dedicated optical-access ports for local optical-probe measurements. These measurements can complement the pressure-based holdup data with local information on the dispersed gas phase, allowing comparison between integral and local measurements.<\/p>\n\n\n\n<p class=\"is-style-prose wp-block-paragraph\">The facility therefore provides a controlled platform for investigating axial variations in gas holdup, identifying changes in flow behaviour along the column, and generating experimental data suitable for the validation of hydrodynamic and multiphase-flow models.<\/p>\n<\/div><\/div>\n\n\n\n<p class=\"is-style-eyebrow facility-figures-label wp-block-paragraph\">Measurement set-up<\/p>\n\n\n\n<div class=\"wp-block-group facility-figures is-single\"><div class=\"wp-block-group__inner-container is-layout-flow wp-block-group-is-layout-flow\">\n<figure class=\"wp-block-image size-full fig-diagram\"><a href=\"https:\/\/www.auriga.polimi.it\/wp-content\/uploads\/2026\/09\/cylindrical-column-rig-diagram.png\"><img loading=\"lazy\" decoding=\"async\" width=\"2560\" height=\"1696\" src=\"https:\/\/www.auriga.polimi.it\/wp-content\/uploads\/2026\/09\/cylindrical-column-rig-diagram-scaled.png\" alt=\"Diagram of the circular bubble-swarm column: compressed air through a mass flow controller to the interchangeable sparger, five pressure ports over four axial sections, three optical probe ports, and the column cross-section\" class=\"wp-image-545\" srcset=\"https:\/\/www.auriga.polimi.it\/wp-content\/uploads\/2026\/09\/cylindrical-column-rig-diagram-scaled.png 2560w, https:\/\/www.auriga.polimi.it\/wp-content\/uploads\/2026\/09\/cylindrical-column-rig-diagram-300x199.png 300w, https:\/\/www.auriga.polimi.it\/wp-content\/uploads\/2026\/09\/cylindrical-column-rig-diagram-1024x678.png 1024w, https:\/\/www.auriga.polimi.it\/wp-content\/uploads\/2026\/09\/cylindrical-column-rig-diagram-768x509.png 768w, https:\/\/www.auriga.polimi.it\/wp-content\/uploads\/2026\/09\/cylindrical-column-rig-diagram-1536x1018.png 1536w, https:\/\/www.auriga.polimi.it\/wp-content\/uploads\/2026\/09\/cylindrical-column-rig-diagram-2048x1357.png 2048w\" sizes=\"auto, (max-width: 2560px) 100vw, 2560px\" \/><\/a><figcaption class=\"wp-element-caption\">Open the diagram at full size<\/figcaption><\/figure>\n<\/div><\/div>\n\n\n\n<nav class=\"facility-nav\" aria-label=\"Other facilities\"><p class=\"is-style-eyebrow\">Other facilities<\/p><ul><li><a href=\"https:\/\/www.auriga.polimi.it\/?page_id=477\">Single-bubble column<\/a><\/li><li><a href=\"https:\/\/www.auriga.polimi.it\/?page_id=478\">Bubble-swarm column<\/a><\/li><li><a href=\"https:\/\/www.auriga.polimi.it\/?page_id=480\">Coalescence cell<\/a><\/li><li><a href=\"https:\/\/www.auriga.polimi.it\/?page_id=481\">CFD-grade column<\/a><\/li><li><a href=\"https:\/\/www.auriga.polimi.it\/?page_id=482\">Mass-transfer column<\/a><\/li><li><a href=\"https:\/\/www.auriga.polimi.it\/?page_id=499\">Large-diameter bubble column<\/a><\/li><\/ul><\/nav>\n\n\n\n<p class=\"is-style-back wp-block-paragraph\"><a href=\"https:\/\/www.auriga.polimi.it\/?page_id=13\">\u2190 Back to Lab<\/a><\/p>\n\n","protected":false},"excerpt":{"rendered":"<p>Small scale \u00b7 Work package b and c A transparent cylindrical bubble column with a total height of approximately 2 m, designed for column-scale characterization of gas holdup under different operating conditions (different superficial velocities and three different spargers). Gas holdup is determined from differential hydrostatic pressure measurements using relative pressure transducers connected to five [&hellip;]<\/p>\n","protected":false},"author":6,"featured_media":0,"parent":13,"menu_order":3,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_monsterinsights_skip_tracking":false,"footnotes":""},"class_list":["post-479","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.auriga.polimi.it\/index.php\/wp-json\/wp\/v2\/pages\/479","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.auriga.polimi.it\/index.php\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.auriga.polimi.it\/index.php\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.auriga.polimi.it\/index.php\/wp-json\/wp\/v2\/users\/6"}],"replies":[{"embeddable":true,"href":"https:\/\/www.auriga.polimi.it\/index.php\/wp-json\/wp\/v2\/comments?post=479"}],"version-history":[{"count":0,"href":"https:\/\/www.auriga.polimi.it\/index.php\/wp-json\/wp\/v2\/pages\/479\/revisions"}],"up":[{"embeddable":true,"href":"https:\/\/www.auriga.polimi.it\/index.php\/wp-json\/wp\/v2\/pages\/13"}],"wp:attachment":[{"href":"https:\/\/www.auriga.polimi.it\/index.php\/wp-json\/wp\/v2\/media?parent=479"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}