Abstract:

The thermally driven heat transfer phenomena in four small-size circular channels in the gravitation field were compared by numerical simulation.In the investigation.the four channels were all heated at one end and cooled at the other,and the therm al driving of fluid is used to accomplish the heat transfer in a high body-force field.The results indicate that the four circular channels all follow the same law of thermally driven heat transfer.and that the ability of thermally driven heat transfer improves with the increase in the number of the circular chan.nels.It is thus concluded that,when utilizing small-size circular channels for the cooling of turbo vanes. the multi.cyclic channel may be feasible because the adaptability of fluid can be utilized to enhance the heat transfor

Key words: heat transfer, therm al driving, small-size circular channel