CFD modeling of air flow and heat transfer of ice cream cabinet参考.ppt

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2018-03-15 发布于贵州
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CFD modeling of air flow and heat transfer of ice cream cabinet参考.ppt

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CFD modeling of air flow and heat transfer of ice cream cabinet参考

* The section of temperature distribution Cut the model in the middle of Y direction (parallel to X) * Left side Bottom side Right side Back side Outline * Heat transport model Complex porous material model Simplified porous material model Natural?convection Thermal boundary condition Summary Problems After above simulation, I also take some other simulations by change the heat flux in the cold wall and the heat flux in the glass wall * Cold wall/W Glass wall/W -500 430 -430 430 -370 430 -270 430 -100 430 I found that the result of simulation have a close relationship with the initial value. When the initial temperature is high, the temperature in the simulation is high. In contrast, when the initial temperature is low, the temperature in the simulation is also low. After I have read many reference, I believe that the thermal boundary condition should be changed. * The third kind boundary condition The third kind boundary condition: Define the heat transfer coefficient between the object and the around space and define the temperature of the around space. How to set in the Fluent: * The cold wall keep the heat flux boundary condition, while the glass wall change to the convection boundary condition as pervious page How to define the heat transfer coefficient: * I test the convection boundary condition in the below simulation, but I use the interior boundary condition instead of the porous-jump boundary condition. I will display the result of simulation in the next several pages and I will use porous-jump boundary condition in the following simulation because it close to the reality. * * Velocity distribution Temperature distribution The section of velocity distribution * Left side Top side Right side Bottom side * The section of velocity distribution(where set the fan) parallel to the XZ surface parallel to the YZ surface parallel to the XY surface * The section of temperature distribution Left side Top side Bottom side Right side * parallel to the XY surface