{"id":383255,"date":"2024-09-20T02:36:58","date_gmt":"2024-09-20T02:36:58","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/updating-gas-species-mass-fractions\/"},"modified":"2024-09-20T02:36:58","modified_gmt":"2024-09-20T02:36:58","slug":"updating-gas-species-mass-fractions","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/updating-gas-species-mass-fractions\/","title":{"rendered":"updating gas species mass fractions"},"content":{"rendered":"<p>&lt;div class=&#8221;flex max-w-full flex-col flex-grow&#8221;&gt;&lt;div class=&#8221;min-h-[20px] text-message flex w-full flex-col items-end gap-2 whitespace-normal break-words [.text-message+&amp;]:mt-5&#8243; dir=&#8221;auto&#8221; data-message-author-role=&#8221;assistant&#8221; data-message-id=&#8221;c2a155bf-f0db-4358-9f21-f4af5958aabc&#8221;&gt;&lt;div class=&#8221;flex w-full flex-col gap-1 empty:hidden first:pt-[3px]&#8221;&gt;&lt;div class=&#8221;markdown prose w-full break-words dark:prose-invert light&#8221;&gt;&lt;p&gt;In particle reaction rate calculations, do I need to update the gas species fractions (such as H\u2082 and H\u2082O) in the UDF? While the mass fractions of solid species change, those of H\u2082 and H\u2082O doesn&#8217;t change. I&#8217;m calculating the reaction rate for hematite reduction with hydrogen. If the gas fractions need to be updated, should I define a new macro like <code>DEFINE_SOURCE<\/code> or use a different approach?&lt;\/p&gt;&lt;\/div&gt;&lt;\/div&gt;&lt;\/div&gt;&lt;\/div&gt;<\/p>\n","protected":false},"template":"","class_list":["post-383255","topic","type-topic","status-publish","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"In particle reaction rate calculations, do I need to update the gas species fractions (such as H\u2082 and H\u2082O) in the UDF? 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