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有一空气冷却器采用如附图所示的结构,冷却水在管外流动,温度为t0,表面传热系数h0 = 2000~3000W /(m²K)。管内中心安置了8个径向肋片,空气在所形成的8个扇形空腔中流动,温度为t1,表面传热系数为h1。运行中芯管的中间不通过空气(两头进出口处堵死)。试针对下列条件计算每米长管子上空气的散热量: d1 =12mm,d0= 36mm, t0=35℃, 1=100℃, h1=50W/(m²K),
=1mm,管材及肋片为铜,其
,管子壁厚为2mm。
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