For natural convection heat transfer of the heat sink with different fin configurations such as straight radial fins and pin fins, how can I calculate the characteristics length in radial heat sink to calculate Nusselt number?
There is no restriction to consider either fin's diameter, hydraulic diameter or heat sink length; in this case heat sink diameter. However, if you are trying to do a validation, you have to use same value that utilized by the publisher.
Dear Waleed tareq al-sallami
Thank you for your response in answering my question, I will conduct experimental analysis on new configurations of radial heat sink and compare between them. I need a rule for calculating the characteristic length of each configuration.
Ok, in this situation, I would suggest to use a parameter which is existed in all models and unchangeable. Besides, you can use heat transfer coefficient or thermal resistance to demonstrate thermal performance instead of Nusselt. Good luck.
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