{"id":127608,"date":"2015-10-08T02:00:00","date_gmt":"2015-10-07T23:00:00","guid":{"rendered":"http:\/\/www.fyysika.ee\/?guid=e2b6195ec4ae20cb45728aa500f9ef67"},"modified":"2015-10-08T02:00:00","modified_gmt":"2015-10-07T23:00:00","slug":"capillary-viscometer-with-a-pressure-sensor-a-subject-for-student-projects","status":"publish","type":"post","link":"https:\/\/www.fyysika.ee\/?p=127608","title":{"rendered":"Capillary viscometer with a pressure sensor: a subject for student projects"},"content":{"rendered":"<p>We describe a vacuum-based pressure-detecting capillary viscometer for the viscosity determination<br \/>\nof Newtonian fluids without known density. The viscometer operates on the principle that the<br \/>\nvariation in air pressure of the vacuum vessel ##IMG##<br \/>\n[http:\/\/ej.iop.org\/images\/0143-0807\/36\/6\/065045\/ejp520534ieqn1.gif] {$pleft(tright)$} replaces the<br \/>\nflow rate and pressure drop measurements which are usually required for the operation of a capillary<br \/>\ntube viscometer. The mathematical expression for ##IMG##<br \/>\n[http:\/\/ej.iop.org\/images\/0143-0807\/36\/6\/065045\/ejp520534ieqn2.gif] {$pleft(tright),$} found in<br \/>\nthe terms of the Lambert-W function, is used to fit the experimental data for viscosity<br \/>\ndetermination. The results for viscosities of distilled water and 50 wt.% glycerol aqueous solution<br \/>\nobtained under ambient temperature condition were compared to reference data and a good agreement<br \/>\nwas observed. The viscometer is suitable for undergraduate l&#8230;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>We describe a vacuum-based pressure-detecting capillary viscometer for the viscosity determination<br \/>\nof Newtonian fluids without known density. The viscometer operates on the principle that the<br \/>\nvariation in air pressure of the vacuum vessel ##IMG##<br \/>\n[h&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_genesis_hide_title":false,"_genesis_hide_breadcrumbs":false,"_genesis_hide_singular_image":false,"_genesis_hide_footer_widgets":false,"_genesis_custom_body_class":"","_genesis_custom_post_class":"","_genesis_layout":"","footnotes":""},"categories":[178],"tags":[],"class_list":{"0":"post-127608","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-rss-fuusikaharidus","7":"entry"},"_links":{"self":[{"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=\/wp\/v2\/posts\/127608","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=127608"}],"version-history":[{"count":0,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=\/wp\/v2\/posts\/127608\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=127608"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=127608"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=127608"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}