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laminr vs turbelent

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hello !
my model is PV cell with duct embedded below in order to cool it down . I used laminar conjugate heat transfer ,so the result show good .But depend on Reylond number the flow is turbulent so I try to solve it using k_epsilon turbulent but the result give unexpected high temperature for PV panel reaches to 90 c.As I know the turbelent flow rises the heat exchange coefficient .

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