{"id":137,"date":"2020-11-23T09:54:12","date_gmt":"2020-11-23T07:54:12","guid":{"rendered":"https:\/\/sites.uef.fi\/ilmari\/?page_id=137"},"modified":"2023-11-07T15:52:37","modified_gmt":"2023-11-07T13:52:37","slug":"137-2","status":"publish","type":"page","link":"https:\/\/sites.uef.fi\/ilmari\/front-page\/137-2\/","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\/ilmari\/wp-content\/uploads\/sites\/161\/2020\/12\/Tube-reactor2.jpg\" alt=\"Tube reactor\" class=\"wp-image-395\" srcset=\"https:\/\/sites.uef.fi\/ilmari\/wp-content\/uploads\/sites\/161\/2020\/12\/Tube-reactor2.jpg 300w, https:\/\/sites.uef.fi\/ilmari\/wp-content\/uploads\/sites\/161\/2020\/12\/Tube-reactor2-219x300.jpg 219w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/figure>\n\n\n\n<p>Fig 1. PEAR flow tube reactor.<\/p>\n\n\n\n<p>References:<\/p>\n\n\n\n<p>Ihalainen, M., Tiitta, P., Czech, H., Yli-Piril\u00e4, P., Hartikainen, A., Kortelainen, M., Tissari, J., Stengel, B., Sklorz, M., Suhonen, H., Lamberg, H., Leskinen, A., Kiendler-Scharr, A., Harndorf, H., Zimmermann, R., Jokiniemi, J., Sippula, O. (2019) A Novel High-Volume Photochemical Emission Aging Flow Tube Reactor (PEAR), Aerosol Science and Technology 53, 276-294.<\/p>\n\n\n\n<p>Hartikainen, A., Tiitta, P., Ihalainen, M., Yli-Piril\u00e4, P., Orasche, J., Czech, H., Kortelainen, M., Lamberg, H., Suhonen, H., Koponen, H., Hao, L., Zimmermann, R., Jokiniemi, J., Tissari, J., Sippula, O. (2020) Photochemical transformation of residential wood combustion emissions: dependence of organic aerosol composition on OH exposure. Atmospheric Chemistry and Physics 20, 6357-6378.<\/p>\n\n\n\n<p><strong>For more information, please contact Prof. Olli Sippula, olli.sippula(at)uef.fi.\u00a0<\/strong><\/p>\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: Fig 1. [&hellip;]<\/p>\n","protected":false},"author":246,"featured_media":0,"parent":32,"menu_order":3,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"class_list":["post-137","page","type-page","status-publish","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Photochemical emission aging flow tube reactor \u2013 PEAR - ILMARI - Aerosol physics, chemistry and toxicology research unit<\/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\/ilmari\/front-page\/137-2\/\" \/>\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 - ILMARI - Aerosol physics, chemistry and toxicology research unit\" \/>\n<meta property=\"og:description\" content=\"The flow reactor method provides a well adjustable system for simulating atmospheric aging processes of various emissions. 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