Heat Transfer Questions & Answers | |
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You can still use the Heisler charts if $\textrm{Fo}<0.2$. But keep in mind there will be a more substantial error on the term determined. In this case, the error is on the parameter $(T_0-T_\infty)/(T_i-T_\infty)$. Thus, if your Fourier number is much less than 0.2, and you have no choice but to use the Heisler chart to solve the problem, you need to make a statement in your solution that there may be significant error on a certain term (don't just say there is error, specify on which term the error is high). I liked your question but it was sloppily typed with no uppercases at the beginning of sentences and some wrong uppercases in the middle of sentences. I'll give you 1 point bonus boost for it.
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Hm, I think you're on the right track, but some logical steps may be missing. In the question, it is stated that the steel can not be cooled faster than 22 degrees per hour. This means that the steel anywhere within the block (at the center, on the edges, and on the corners) can not be cooled faster than 22 degrees per hour. As we learned in class, you can use either the LCA (or a similar approach based on a similar derivation with the same assumptions) or the Heisler charts to solve such a problem. First, you need to determine which approach is appropriate and why. Then determine which part of the steel will be cooling fastest and focus on that from then on.. I'll give just a 0.5 point boost here because the question is not really a question but more a verification of your solution.
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You have to find the most accurate answer possible given the tools outlined in class. If we have seen a way to take into consideration the interaction of one fin's heat transfer on the other, then use such a way. I'll give you 0.5 points bonus boost here.
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You can read about it here: https://en.wikipedia.org/wiki/Auxiliary_power_unit |
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I do not understand your question.. I don't think I mentioned that $t\gg w$.. Your questions don't sound genuine or are badly formulated. To give you more time to ask a proper question, I set the minimum interval between questions per student to 2 days.
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The bonus boost has been added to the scoresheet for the midterm bonus. Check if it has been added correctly.
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$\pi$ |