化工原理杨祖荣1-7章习题答案(完美排版)教学文稿.doc

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1、__________________________________________________目录第一章流体流动与输送机械·····················································（2）第二章非均相物系分离·························································（32）第三章传热···································································（42）第四章蒸发··········

2、·························································（69）第五章气体吸收·······························································（73）第六章蒸____________________________________________________________________________________________________馏··········································

3、·························（95）第七章固体干燥·······························································（119）__________________________________________________________________________________________________________________________________________________________________________________

4、______________________第三章传热1、某加热器外面包了一层厚为300mm的绝缘材料，该材料的导热系数为0.16W/（m×℃），已测得该绝缘层外缘温度为30℃，距加热器外壁250mm处为75℃，试求加热器外壁面温度为多少？解：2、某燃烧炉的平壁由下列三种砖依次砌成；耐火砖b1=230mm，l1=1.05W/(m·℃)绝热砖b2=230mm，l2=0.151W/(m·℃)建筑砖b3=240mm，l3=0.93W/(m·℃)已知耐火砖内侧温度为1000℃，耐火砖与绝热砖界面处的温度为940℃，要求绝热砖与建筑砖界面处的温度不得超过138℃，试求

5、：（1）绝热层需几块绝热砖；（2）普通砖外侧温度为多少？解：（1）b2=?230mm

6、73Ｋ，试求每米管长的热损失及钢管外表面的温度。解：已知钢管的内半径　　　　钢管的外半径　　　　保温层的外半径根据式（3-12a），每米管长的热损失由于是定态热传导，故各层传导的热量应该相等，可得到钢管外表面的温度t2。4、Φ60×3㎜的铝合金管（导热系数近似按钢管选取），外面依次包有一层30mm的石棉和30mm的软木。石棉和软木的导热系数分别为0.16Ｗ／（ｍ·Ｋ）和0.04Ｗ／（ｍ·Ｋ）（管外涂防水胶，以免水汽渗入后发生冷凝及冻结）。（1）已知管内壁温度为-110℃，软木外侧温度为10℃，求每米管长上损失的冷量；（2）计算出钢、石棉及软木层各层热阻在总热

7、阻中所占的百分数；（3）若将两层保温材料互换（各层厚度仍为30mm），钢管内壁面温度仍为-110℃，作为近似计算，假设最外层的石棉层表面温度仍为10℃。求此时每米管长损失的冷量。____________________________________________________________________________________________________提示：保温层互换后，保温层外壁面与空气间的对流传热膜系数与互换前相同。解：(1)每米管长损失的冷量：(2)各层热阻在总热阻中所占的分数：由以上计算可知钢管热阻很小，且。(3)若将互换，厚

8、度不变，且认为不变。以上计算可以看出，将保温性能好的