Help needed for forced convection and heat transfer coefficient

James_Wang

I need help to calculate heat transfer coefficient for complex shape, better with simplest way for example analytical way or simplified Ansys/ CFD.
Meanwhile I am doing forced convection, probably need help to generate some parameters as well.

The solution should be professional, I need also relative quick solution. I will pay for it.

Here is my email: james_consulting@hotmail.com, please leave you contact details, better mobile phone. We can talk about the issue.

Many thanks!

James_Wang

Sorry, I neam, I will pay for your help with Money.

James_Wang

The Problem has been solved by myself. However I still wonder, why no body interests in it? Don't want get money or not capable to do it?

I still want know some body here, which are really professional in CFD. May be in future we can share some projects

iomega

Hehe, could you please propose your approach to this problem? I am very interested in how you develop simple analytical model for such complex  problem - not using CFD though?

James_Wang

Yes, CFD is very accurate, however what I am doing, to simplify my strcuture into the standard model:checking thermal bundary layer,, then using vertical palte. flate plate, and ect, then using Nu number, Prandt Number, Grashof number.
Regards!

iomega

Hehe, I like this kind of approach. It has been almost ten years since I dug into the details of convective heat transfer. Since then, a simple effective heat transfer coefficient is usually good enough for most of the realistic problems I met.

BTW, don't trust CFD simulation that much - my experience is that the results differ a lot from the experimental data: you have uncertainties of the thermal properties and boundary conditions in simulation while uncertainties in power, velocity and temperature measurements in experiments as well.

chaos_zzy

CFD is trustworthy if it is used in proper way; experienced formula is also reliable in special condition, so the key point is to know the state of your problem, then choose the better tools for calculation.

In my view, for draft result use experienced formula, for precise result use CFD software.

凌白日

呵呵，ls各位的英语俺还看得懂，多亏有初中的基础