New improved correlations for developing and diminishing coolant flow heat transfer coefficient as the coolant flow enters and leaves curved section of cooling channels are developed. The correlations are based on rectangular cooling channels and it is demonstrated that the heat transfer coefficients variation behave differently for the three surfaces of cooling channels. The three variables that are incorporated in the heat transfer coefficient correlations include, dimensionless distance from entrance or exit of the curved section, the dimensionless radius of curvature and cooling channel aspect ratio.
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