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2011年最初の日の午前21問

2016-07-26View Original

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3種類の流体、空気の流速は30m/s、水の流速は1.5m/s、蒸気の凝縮、対流熱伝達係数の大きさの順序
Reply #22016-07-27
なぜですか?説明してもらえますか?
Reply #32016-07-27
蒸気の凝縮>水の流速1.5m/s>空気の流速30m/s
Reply #42016-07-27
空気の流速は30m/s、水の流速は1.5m/sで、蒸気の凝縮は順次増大する。対流熱伝達係数はARe^a.Pr^b.熱伝導率/管長によって表されるが、空気の熱伝導率およびPr値は液体よりもはるかに低いため最も小さくなる。一方、蒸気の凝縮潜熱は非常に高く、その対流熱伝達係数も最も高くなる

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