2013年専門知識午前第28問
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28.対流熱伝達において、熱伝達駆動力△tmが2倍になった場合、円形の直管内の強制乱流条件下で（全熱伝達係数や物性の影響は考慮しない）、熱伝達速度が増加する倍率は、以下のうちどれになるか？A.2 B.1 C.4 D.8 どうやって解く？？
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