重力场下细微循环通道内热驱动换热的数值模拟

Numerical Simulation of Thermally Driven Heat Transfer in Small-Size Circular Channels in Gravitation Field

采用数值模拟方法,比较了重力场下4种细微循环通道内的热驱动换热现象.4种通道都是一端加热,一端冷却,利用彻体力场下流体的热驱动来实现换热.研究表明,4种循环通道具有相同的热驱动换热规律,并且随着循环通道的增加,热驱动换热能力逐渐增强.因此,将微小循环通道换热运用于涡轮叶片的冷却时可以考虑采用多循环通道,利用流体的自适应性来增强换热.

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 thermal 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 channels. It is thus concluded that, when utilizing small-size circular channels for the cooling of turbo vanes, the multicyclic channel may be feasible because the adaptability of fluid can be utilized to enhance the heat transfer.