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Natural convection in heat transfer

Posted 16.07.2013, 03:20 GMT-4 Heat Transfer & Phase Change Version 3.5a 2 Replies

Vinay Patel
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I am solving natural convection problem for 5hrs in which first problem start with conduction and finish with natural convection effects for solid liquid interface location. During first 1 and 2hrs the conduction held and remaining 3 to 5hrs natural convection held. The natural convection shows very good effect ,but the conduction first 1 and 2hrs the conduction takes place very first (i.e. solid liquid interface location moves very fast). Also the time steps I kept as 0.1 then also the conduction becomes very fast for first 1 and 2hrs. Can anybody give the answer why it is happened. Or how I have to controlled the conduction for first 1 and 2hrs for solid liquid effect. Or Which parameters I have to controlled.

Thanks in advanced.
Vinay Patel
2 Replies Last Post 18.07.2013, 00:03 GMT-4
Shuping Wang
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Posted: 1 decade ago 17.07.2013, 22:00 GMT-4
Hello Patel,

What do you mean by the heat capacity method? And what do you mean by the movement of the solid-liquid interface? You have a moving boundary problem? I am fairly confused by your problem description.

Thanks,

Shuping
Hello Patel, What do you mean by the heat capacity method? And what do you mean by the movement of the solid-liquid interface? You have a moving boundary problem? I am fairly confused by your problem description. Thanks, Shuping
Vinay Patel
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Posted: 1 decade ago 18.07.2013, 00:03 GMT-4
During the simulation process from starting conduction to natural convection. I start to run the model for the first conduction for 2hrs.

I also reduced the time steps but it is not give the correct answered.

So you have any idea that how I have to controlled the first starting conduction process.

Thanking you,

Vinay Patel
During the simulation process from starting conduction to natural convection. I start to run the model for the first conduction for 2hrs. I also reduced the time steps but it is not give the correct answered. So you have any idea that how I have to controlled the first starting conduction process. Thanking you, Vinay Patel

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