{"id":235517,"date":"2022-09-16T20:54:51","date_gmt":"2022-09-16T20:54:51","guid":{"rendered":"\/forum\/forums\/topic\/will-the-flow-from-a-room-fan-be-laminar-or-turbulent\/"},"modified":"2022-09-16T20:54:51","modified_gmt":"2022-09-16T20:54:51","slug":"will-the-flow-from-a-room-fan-be-laminar-or-turbulent","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/will-the-flow-from-a-room-fan-be-laminar-or-turbulent\/","title":{"rendered":"Will the flow from a room fan be laminar or turbulent?"},"content":{"rendered":"<p>I need to know whether to use a laminar or turbulent viscosity model, and if I need a turbulent one, which one to pick.<\/p>\n<p>I am simulating the flow created by a 5 bladed room fan. We already took measurements of the air velocity created by the actual fan using an anemometer. We are not sure what the best effective viscosity settings are though, because we are not certain whether our flow is laminar or turbulent. Here is what we have so far.<\/p>\n<p>Using a slow motion setting on a camera, the rpm was measured\/counted to vary between 1033 and 1380 rpm. The fan geometry we are using in our simulation is shown below.&nbsp;<\/p>\n<p><img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2022\/09\/16-09-2022-1663360573-mceclip0.png\"><\/p>\n<ul>\n<li>Width of tips of fan blades (w) &#8211; 0.076 m<\/li>\n<li>Circumference of fan (c) &#8211; 1.1 m.<\/li>\n<li>Kinematic viscosity of air (k) &#8211; 0.00001506 m^2\/s.<\/li>\n<li>Based on the rpm and circumference, I calculated the tips of the fan blades to be moving at 19 to 20.9 m\/s (v)<\/li>\n<li>I estimated the Reynolds number using w*v\/k\n<ul>\n<li>Re ranged from 96,000 to 128,000<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>What would the critical Reynolds number be for a situation like this?<\/p>\n","protected":false},"template":"","class_list":["post-235517","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["263228","62","263554"],"_bbp_author_ip":["23.220.96.181"]," _bbp_last_reply_id":["0"]," _bbp_likes_count":["0"],"_btv_view_count":["1432"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["235517"],"_bbp_forum_id":["27792"],"_bbp_engagement":["62","263228","263554"],"_bbp_voice_count":["3"],"_bbp_reply_count":["6"],"_bbp_last_reply_id":["236352"],"_bbp_last_active_id":["236352"],"_bbp_last_active_time":["2022-09-27 02:44:50"]},"test":"melaniebutts12gmail-com"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/235517","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics"}],"about":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/types\/topic"}],"version-history":[{"count":0,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/235517\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=235517"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}