Abstract
Transition can have profound effects on friction and heat transfer in flow passages. According to the proposed law of corresponding states for friction, different types of roughness elements exhibit the same behavior for friction at the same reduced conditions, as is the case for smooth passages of arbitrary shapes. For smooth or rough tubes, it appears that the average heat transfer coefficient decreases with increasing critical Reynolds number for transition. For non-circular smooth passages, average heat transfer coefficients can be calculated from the circular tube relations, provided the critical values for friction factor and Reynolds number are known.
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