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298页13题.在一单程列管换热器中,用饱和蒸汽加热原料油。温度为160°C饱和蒸汽在壳程冷凝(排出饱和液体),原料油在流动,并由20°C加热到106°C,列管换热器尺寸为:列管直径为ф19×2mm,管长为4m ,共25根管子。若换热器的传热量为125Kw,蒸汽冷凝传热系数为7000 W/(m 2 • °C),油侧污垢热阻可去为0.0005 m 2 • °C/W,热阻和蒸汽侧垢层热阻可忽略,试求管内油侧对流传热系数。 又若有的流速增加一倍,此时若换热器的总传热系数为原来的 1.75倍,试求油的出口温度。假设油的物性不变。
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【简答题】According to the speaker, the press will lose readers unless the editors and the news directors
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