{"id":1305,"date":"2020-12-16T13:17:06","date_gmt":"2020-12-16T11:17:06","guid":{"rendered":"https:\/\/sites.uef.fi\/fine\/?page_id=1305"},"modified":"2023-11-06T15:12:23","modified_gmt":"2023-11-06T13:12:23","slug":"photochemical-emission-aging-flow-tube-reactor-pear","status":"publish","type":"page","link":"https:\/\/sites.uef.fi\/fine\/front-page\/research-areas\/combustion-facilities\/photochemical-emission-aging-flow-tube-reactor-pear\/","title":{"rendered":"Photochemical emission aging flow tube reactor \u2013 PEAR"},"content":{"rendered":"\n<p>The flow reactor method provides a well adjustable system for simulating atmospheric aging processes of various emissions. The setup is equipped with 254 nm UV lamps and external O3 feeding. The design was aided with CFD simulations in order to achieve as well-defined laminar flow profile as possible.<\/p>\n\n\n\n<p>Specifications for the flow tube:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Typical flow rates 50-200 lpm -&gt; 0.5-2 min residence time<\/li>\n\n\n\n<li>Adjustable OH-exposure: ~ 109\u20131012 molec cm-3 s<\/li>\n\n\n\n<li>Online monitoring of photochemical age via D9-butanol according to Barmet et al. (2012, AMT)<\/li>\n\n\n\n<li>Particle losses: 1-10% for 50 nm particles, depending on the used flow rate.<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"411\" src=\"https:\/\/sites.uef.fi\/fine\/wp-content\/uploads\/sites\/158\/2020\/12\/Tube-reactor2.jpg\" alt=\"Tube reactor\" class=\"wp-image-1308\" srcset=\"https:\/\/sites.uef.fi\/fine\/wp-content\/uploads\/sites\/158\/2020\/12\/Tube-reactor2.jpg 300w, https:\/\/sites.uef.fi\/fine\/wp-content\/uploads\/sites\/158\/2020\/12\/Tube-reactor2-219x300.jpg 219w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>The flow reactor method provides a well adjustable system for simulating atmospheric aging processes of various emissions. The setup is equipped with 254 nm UV lamps and external O3 feeding. The design was aided with CFD simulations in order to achieve as well-defined laminar flow profile as possible. Specifications for the flow tube:<\/p>\n","protected":false},"author":246,"featured_media":0,"parent":92,"menu_order":3,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"footnotes":""},"class_list":["post-1305","page","type-page","status-publish","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.1.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Photochemical emission aging flow tube reactor \u2013 PEAR - Fine Particle and Aerosol Technology Laboratory<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/sites.uef.fi\/fine\/front-page\/research-areas\/combustion-facilities\/photochemical-emission-aging-flow-tube-reactor-pear\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Photochemical emission aging flow tube reactor \u2013 PEAR - Fine Particle and Aerosol Technology Laboratory\" \/>\n<meta property=\"og:description\" content=\"The flow reactor method provides a well adjustable system for simulating atmospheric aging processes of various emissions. The setup is equipped with 254 nm UV lamps and external O3 feeding. The design was aided with CFD simulations in order to achieve as well-defined laminar flow profile as possible. 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