{"id":161709,"date":"2023-01-25T07:16:44","date_gmt":"2023-01-25T07:16:44","guid":{"rendered":"\/knowledge\/forums\/topic\/how-to-specify-multiple-devolatilizing-species-for-combusting-particles-in-fluent-as-one-can-select-only-single-species-as-the-devolatilizing-species\/"},"modified":"2023-07-31T12:35:45","modified_gmt":"2023-07-31T12:35:45","slug":"how-to-specify-multiple-devolatilizing-species-for-combusting-particles-in-fluent-as-one-can-select-only-single-species-as-the-devolatilizing-species","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/how-to-specify-multiple-devolatilizing-species-for-combusting-particles-in-fluent-as-one-can-select-only-single-species-as-the-devolatilizing-species\/","title":{"rendered":"How to specify multiple devolatilizing species for Combusting particles in FLUENT as one can select only single species as the devolatilizing species?"},"content":{"rendered":"<p>Sometimes it is required to specify the multiple species as the evaporating species in DPM. This is one of the requirements for volatile break-up while modeling coal combustion or gasification. However, in FLUENT only one species is allowed as the evaporating species.  Above limitation can be worked around using a pseudo species and a pseudo reaction. Define a pseudo species (e.g. volatile) in the mixture. Specify this species as the evaporating species. Then, define a pseudo reaction (e.g. volatile-break-up-reaction). Reactant of this reaction is the pseudo species and the products would be the required multiple species of the volatile break-up. This reaction should be faster than other reactions included in the model so that species evolved due to volatile break-up are not limiting the other reactions. This can be done by specifying large pre-exponential factor for Laminar finite rate model or large mixing rate constant, A for the eddy dissipation model. Molecular weight and standard state enthalpy for the pseudo species can be adjusted so that no heat is produced or consumed in the volatile break-up reaction.<\/p>\n","protected":false},"template":"","class_list":["post-161709","topic","type-topic","status-publish","hentry","topic-tag-4457","topic-tag-combustion","topic-tag-dpm","topic-tag-evaporation","topic-tag-fluent","topic-tag-fluid-dynamics"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_wp_page_template":["default"],"_bbp_forum_id":["27796"],"_bbp_author_ip":["23.56.168.180"],"_bbp_last_active_time":["1-24-2023  20:20:30"],"_btv_view_count":["1133"],"siebel_km_number":["2002714"],"product_version":["14"],"km_published_date":["2009-09-25T01:02:29.000Z"],"family":["Fluid Dynamics"],"application_name":["FLUENT"]},"test":"articlesansys-com"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/topics\/161709","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/topics"}],"about":[{"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/types\/topic"}],"version-history":[{"count":0,"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/topics\/161709\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/media?parent=161709"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}