{"id":360804,"date":"2024-04-05T20:28:37","date_gmt":"2024-04-05T20:28:37","guid":{"rendered":"\/forum\/forums\/topic\/thermal-analyses-correct-approaches\/"},"modified":"2024-04-05T20:41:51","modified_gmt":"2024-04-05T20:41:51","slug":"thermal-analyses-correct-approaches","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/thermal-analyses-correct-approaches\/","title":{"rendered":"Thermal analyses, correct approaches?"},"content":{"rendered":"

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A thermal analysis, specifically a temperature distribution, is requested for a situation involving conduction and convection. The scenario involves insulation of a pipe exposed to an interior temperature of 600 degrees Celsius and an ambient temperature of 20 degrees Celsius with a convection coefficient of 9 W\/m^2°C. There are two approaches: 1. Introducing a point thermal conductivity value, namely 0.119 (for the interior temperature of 600 degrees Celsius), and case 2, where the conductivity is introduced linearly, as shown in the figure. Is there someone who can specify which of the two cases is the correct approach? <\/span><\/p>\n

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  1. T=600 C(on inner line), and thermal conductivity at 600 C is 0.119 (for calcium silicate insulation)<\/span><\/li>\n
  2. T=600 C(on inner line), and thermal conductivity is inserted according with fig2. (temperature dependent) (for calcium silicate insulation)<\/span><\/li>\n<\/ol>\n

       Why do the results still differ, in the sense that the exterior temperature in case 1 is 131 degrees Celsius, while in case 2, it is 113 degrees Celsius?<\/span><\/p>\n

        ANSYS interpolates thermal conductivity values based on temperature (during the analysis)???. <\/span><\/p>\n

       So conductivity values must always be introduced as distributions rather than point values?<\/span><\/p>\n

       Stady state thermal approach is ok<\/p>\n

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