{"id":53503,"date":"2021-03-17T08:59:40","date_gmt":"2021-03-17T08:59:40","guid":{"rendered":"\/forum\/forums\/topic\/laser-welding-how-to-apply-recoil-pressure-in-the-momentum-equation\/"},"modified":"2021-03-17T08:59:40","modified_gmt":"2021-03-17T08:59:40","slug":"laser-welding-how-to-apply-recoil-pressure-in-the-momentum-equation","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/laser-welding-how-to-apply-recoil-pressure-in-the-momentum-equation\/","title":{"rendered":"Laser welding- how to apply recoil pressure in the momentum equation"},"content":{"rendered":"<div class=\"Item-Body\">\n<div class=\"Message userContent\">\n<p>The laser will heat and melt the surface of steel with a temperature reaching above the evaporating temperature of the material (3000 K). Close to the evaporation temperature, the metal surface vaporizes and creates a small depression which is due to the effect of Recoil pressure (pressure acting against vaporization of steel). this recoil effect helps in Keyhole formation and aids in deeper penetration of laser weld. This effect is considered on the free surface.<\/p>\n<p>During the simulation, the recoil effect is added as a momentum source in term as a volumetric force (dividing recoil pressure with gradients of volume fraction (N\/m3) ) in the vapour cell when the temperature is above boiling point.<\/p>\n<p>Phase considered are: steel liquid(ID 3), steel vapour(ID 4) and air(ID 2)<\/p>\n<div class=\"embedExternal embedImage\">\n<div class=\"embedExternal-content\">\n<a class=\"embedImage-link\" href=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/XCT42FKS13C4\/recoil-pressure.jpg\" rel=\"nofollow noopener\" target=\"_blank\"><br \/>\n<img decoding=\"async\" class=\"embedImage-img\" src=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/XCT42FKS13C4\/recoil-pressure.jpg\" alt=\"RECOIL PRESSURE.jpg\" \/><br \/>\n<\/a><\/p>\n","protected":false},"template":"","class_list":["post-53503","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_old_topic_id":["25821"],"_bbp_old_topic_author_name_id":["Anonymous"],"_bbp_old_is_topic_anonymous_id":["false"],"_bbp_old_closed_status_id":["publish"],"_bbp_author_ip":["g??\u0019"],"_bbp_old_sticky_status_id":["normal"],"_bbp_likes_count":["0"],"_btv_view_count":["3112"],"_bbp_subscription":["232671"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["53503"],"_bbp_forum_id":["27792"],"_bbp_engagement":["5120","184487","186138"],"_bbp_voice_count":["3"],"_bbp_reply_count":["7"],"_bbp_last_reply_id":["147829"],"_bbp_last_active_id":["147829"],"_bbp_last_active_time":["2021-03-24 09:10:49"]},"test":"youfoura"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/53503","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\/53503\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=53503"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}