{"id":499,"date":"2026-09-30T11:26:53","date_gmt":"2026-09-30T11:26:53","guid":{"rendered":"https:\/\/www.auriga.polimi.it\/index.php\/lab\/large-diameter-bubble-column-2\/"},"modified":"2026-10-19T11:43:22","modified_gmt":"2026-10-19T11:43:22","slug":"large-diameter-bubble-column","status":"publish","type":"page","link":"https:\/\/www.auriga.polimi.it\/index.php\/lab\/large-diameter-bubble-column\/","title":{"rendered":"Large-diameter bubble column"},"content":{"rendered":"\n<p class=\"is-style-eyebrow wp-block-paragraph\">Large scale \u00b7 Work package D<\/p>\n\n\n\n<div class=\"wp-block-group facility-detail is-large-col\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\">\n<figure class=\"wp-block-image size-full rig-drawing\"><img loading=\"lazy\" decoding=\"async\" width=\"304\" height=\"2560\" src=\"https:\/\/www.auriga.polimi.it\/wp-content\/uploads\/2026\/09\/large-column-drawing-scaled.png\" alt=\"CAD elevation of the large-diameter bubble column\" class=\"wp-image-428\"\/><\/figure>\n\n\n\n<div class=\"wp-block-group facility-text\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\">\n<p class=\"is-style-lede wp-block-paragraph\">The pilot-scale facility is designed to investigate gas\u2013liquid flow behaviour and CO\u2082 mass transfer under operating conditions representative of industrial systems. The setup consists of a cylindrical bubble column (0.40 m in diameter and 5.0 m in height), equipped with a counter-current liquid recirculation loop and advanced instrumentation for local and global measurements.<\/p>\n\n\n\n<p class=\"is-style-prose wp-block-paragraph\">Doppler probes installed at different heights provide local measurements of gas holdup, bubble size distribution and bubble velocity, while a Wire-Mesh Sensor enables high-resolution measurements of cross-sectional void fraction distributions, interfacial area concentration and bubble chord lengths. Pressure transmitters provide additional information on global gas holdup, pressure fluctuations and flow regime characteristics.<\/p>\n\n\n\n<p class=\"is-style-prose wp-block-paragraph\">To investigate mass transfer performance, pH and conductivity probes positioned along the column monitor changes in liquid properties and composition during CO\u2082 absorption. Gas flow measurements at the inlet and outlet enable the assessment of CO\u2082 absorption rates and overall mass transfer performance under different operating conditions.<\/p>\n\n\n\n<p class=\"is-style-prose wp-block-paragraph\">The facility provides a comprehensive experimental database for characterizing the coupling between hydrodynamics and mass transfer, supporting the development and validation of multiphase flow and mass transfer models at pilot scale.<\/p>\n\n\n\n<ul class=\"wp-block-list is-style-spec-list\">\n<li><strong>Column<\/strong> \u2014 5.0 m height, 0.40 m diameter, 2.5 m initial liquid level, liquid recirculation, gas sparger region 0.40 m<\/li>\n\n\n\n<li><strong>Spargers<\/strong> \u2014 Interchangeable perforated plates with different hole diameters<\/li>\n\n\n\n<li><strong>Global measurements<\/strong> \u2014 Gas holdup, gas disengagement, global mass transfer<\/li>\n\n\n\n<li><strong>Local measurements<\/strong> \u2014 Three optical probes (void fraction, bubble size, velocity), wire-mesh sensors, image analysis near the sparger and at different radial\/axial positions<\/li>\n<\/ul>\n<\/div><\/div>\n<\/div><\/div>\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\/large-column-counter-current-diagram.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"2560\" height=\"1696\" src=\"https:\/\/www.auriga.polimi.it\/wp-content\/uploads\/2026\/09\/large-column-counter-current-diagram-scaled.jpg\" alt=\"Diagram of the large-diameter bubble column in counter-current operation: CO2 feed through a mass flow controller to the perforated distributor, liquid recirculation loop with pump and flow meter, Doppler probes and the wire-mesh sensor along the height, pH, conductivity and pressure ports, and the outlet gas flow meter\" class=\"wp-image-546\" srcset=\"https:\/\/www.auriga.polimi.it\/wp-content\/uploads\/2026\/09\/large-column-counter-current-diagram-scaled.jpg 2560w, https:\/\/www.auriga.polimi.it\/wp-content\/uploads\/2026\/09\/large-column-counter-current-diagram-300x199.jpg 300w, https:\/\/www.auriga.polimi.it\/wp-content\/uploads\/2026\/09\/large-column-counter-current-diagram-1024x678.jpg 1024w, https:\/\/www.auriga.polimi.it\/wp-content\/uploads\/2026\/09\/large-column-counter-current-diagram-768x509.jpg 768w, https:\/\/www.auriga.polimi.it\/wp-content\/uploads\/2026\/09\/large-column-counter-current-diagram-1536x1018.jpg 1536w, https:\/\/www.auriga.polimi.it\/wp-content\/uploads\/2026\/09\/large-column-counter-current-diagram-2048x1357.jpg 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=479\">Circular 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><\/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>Large scale \u00b7 Work package D The pilot-scale facility is designed to investigate gas\u2013liquid flow behaviour and CO\u2082 mass transfer under operating conditions representative of industrial systems. The setup consists of a cylindrical bubble column (0.40 m in diameter and 5.0 m in height), equipped with a counter-current liquid recirculation loop and advanced instrumentation for [&hellip;]<\/p>\n","protected":false},"author":6,"featured_media":0,"parent":13,"menu_order":7,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_monsterinsights_skip_tracking":false,"footnotes":""},"class_list":["post-499","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.auriga.polimi.it\/index.php\/wp-json\/wp\/v2\/pages\/499","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=499"}],"version-history":[{"count":0,"href":"https:\/\/www.auriga.polimi.it\/index.php\/wp-json\/wp\/v2\/pages\/499\/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=499"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}