Heat Transfer Questions & Answers | |
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You need to improve the quality of your typesetting: the text is too hard to read.. Type the question again.
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Well, what is the difference between these two equations? The answer lies there probably..
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Strictly speaking, no, a turbulent flow is always unsteady. But, if you take a time average of the flow properties within the turbulent boundary layer over a small amount of time (like 1-10 ms or so), then the turbulent flow can appear steady. In this course we're not concerned with the dynamics of turbulence, we simply consider the averaged properties of turbulence, so we call such turbulent flows “steady”. Good question. 2 points bonus.
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In this course, the flow is considered fully turbulent at a location where the Reynolds number is larger than $5\times 10^5$. The flow is considered “mixed” if integrating both the laminar and the turbulent regions. 1.5 point bonus.
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Well then you can not use these correlations. So you need to find another way..
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$\pi$ |