科研之友
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摘要
Part of the electric energy consumes in the electric resistance tape and turns into heat energy when an electric locomotive is braking. The safety of the locomotive will be threatened if heat energy in the electric resistance tape does not dissipate as quickly as possible. So it is important to know the flow and heat transfer characteristics of air in the electric resistance tape channels. The periodically fully developed laminar flow in a electric resistance tape has been investigated by numerical analysis in the Reynolds number range of 300-1000. A set of laminar flow predictions are presented to demonstrate the effects of the different Reynolds numbers, different angles of aggress and different extents of slots on the Nusselt number and the friction factor. The results show: With the same angle of aggress, Nu increases with increase of the extent of slot, and the friction factor increases more than Nu; with the same extent of slot, Nu and the friction factor both increase with increase of the angle of aggress; L(extent of slot)=5 mm and α (angle of aggress)=30° are the optimum parameters, which help to gain higher thermal transfer efficiency and smaller friction.
- 出版日期2007
