{"id":36606,"date":"2019-07-17T20:08:45","date_gmt":"2019-07-17T20:08:45","guid":{"rendered":"\/forum\/forums\/topic\/convection-question\/"},"modified":"2019-07-17T20:08:45","modified_gmt":"2019-07-17T20:08:45","slug":"convection-question","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/convection-question\/","title":{"rendered":"Convection question!"},"content":{"rendered":"<p>Hello all,<\/p>\n<p><\/p>\n<p>In ANSYS Mechanical, I am modeling a simple plastic pipe, as shown below. The pipe is set to a uniform temperature of 100C and cooled down. The temperature vs. time cool-down curve for the model does not match very well with my controlled, experimental results. In the model, the pipe is modeled&nbsp;<span style=\"color: #000000; font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 16px;\">as standing vertical. I<\/span><span style=\"color: #000000; font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 16px;\">&nbsp;then apply convection to all surfaces of the pipe (the experimental measurement is from a suspended pipe). I also provide the program with a look-up table for the heat transfer coefficients, as determined from a heat transfer equation. The big question is: What am I missing? Does Mechanical model the flow of air to simulate the chimney effect? Any help is greatly appreciated!!<br \/>-JP<\/span><\/p>\n<p><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/attachments.office.net\/owa\/jpv10@wildcats.unh.edu\/service.svc\/s\/GetAttachmentThumbnail?id=AQMkAGM3ZGMxNDFjLTQ2MmEtNDc5ZS05ZTk3LWFjZTQyNmRlOWZlNwBGAAADcVKzDEKka02JdkcXi4fluQcA%2B3k6FErTH0Wd%2FLnpel6dOgAAAgEJAAAA%2B3k6FErTH0Wd%2FLnpel6dOgAEdCRGPQAAAAESABAA43uBmAOQmke13uNjBiwnYw%3D%3D&amp;thumbnailType=2&amp;owa=outlook.office.com&amp;scriptVer=2019070701.13&amp;X-OWA-CANARY=HpzPvpduS0K1lx2f56Wz5sALXnvxCtcY2T1SNS1gCF9pNTm2gGoqfdMNAPBEePfhKCXgmUvkA0c.&amp;token=eyJhbGciOiJSUzI1NiIsImtpZCI6IjA2MDBGOUY2NzQ2MjA3MzdFNzM0MDRFMjg3QzQ1QTgxOENCN0NFQjgiLCJ4NXQiOiJCZ0Q1OW5SaUJ6Zm5OQVRpaDhSYWdZeTN6cmciLCJ0eXAiOiJKV1QifQ.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.Z9pKsTAiqd4eTi_2_M9_lhD7ZAM47VKuSLbMZUEnfmpCO33X_r9aCHjiu5WrO88l-rO-pSauzxKMAlBeZs7hFe7I9cSP1fct_FWm5bTT0C3gpruJDlIwQInw-FKaYk0kHccij463uEohWDsKnsiRUuhA0Lco9HE5pMaCvwJ0o08fl5VBGjeuY-FFoMIOQIvPRpnlJU3TPGVQ8qRfgsB7iiZSc_Eo9WPlvhpN2DNipSq89zNfpj2Wu3gfMnEmoLAM8SO6Mk-HR93OASwTYRyMXVwp5ET3PAw5_lzzQPez7_8fuJQKUiios3H4J0G_zuxsF7VHW3Y6GDKHsNy8mrIblQ&amp;animation=true\"><\/p>\n","protected":false},"template":"","class_list":["post-36606","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_old_topic_id":["8778"],"_bbp_old_topic_author_name_id":["Anonymous"],"_bbp_old_is_topic_anonymous_id":["false"],"_bbp_old_closed_status_id":["publish"],"_bbp_author_ip":[null],"_bbp_old_sticky_status_id":["normal"],"_bbp_likes_count":["0","0"],"_btv_view_count":["2754"],"_bbp_subscription":["241334"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["36606"],"_bbp_forum_id":["27791"],"_bbp_engagement":["240","166679","178814"],"_bbp_voice_count":["3"],"_bbp_reply_count":["15"],"_bbp_last_reply_id":["119253"],"_bbp_last_active_id":["119253"],"_bbp_last_active_time":["2020-06-27 19:54:37"]},"test":"jvardaman"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/36606","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\/36606\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=36606"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}