1、The heat transferring drum pipe, its heat insulativity and its heat-insulating Layer's thickness have not the distance scale.
2、Then it briefly introduces the basic theories and knowledge of heat transferring.
3、In this paper, based on the theory of heat transferring, an thermal model of thermooptical devices is established.
4、Finned tube is welded the finned helix pieces on the smooth tube, expanding4~10 times of the heat transfer surface, highly elevated the heat-transfer coefficient of the tube to reach the purpose of rapid, efficient heat transferring.
5、The results show that the main factor is the heat transferring to the material, the conglomeration and growing of the cobalt powder on different material bed is effected by the temperature gradient.
