円管群を過ぎる流れの安定性と熱伝達(乱流熱物質拡散・伝達(1),一般講演)

概要

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Heat transfer in flow through a bundle of tubes and its stability are investigated numerically. The flow past a two-dimensional array of heated tubes are numerically simulated, in which the tubes are arranged being in-line in each line having ten rows deep and pitch-to-diameter ratios of 2.0x3.0. The temperature on the surfaces of tubes are assumed to be the same with each other. The flow is steady and symmetric with respect to the streamwise centerline through centers of tubes at small Reynolds numbers, but it becomes oscillatory due to instability above a ciritcal Reynolds number. The average Nusselt number for the heat transfer between the tubes and fluid was evaluated for oscillatory flow as well as for steady flow, and the difference in the average Nusselt number for the steady and oscillatory flows was discussed. It was found that the increasing ratio of the average Nusselt number with respect to the Reynolds number is larger in the oscillatory flow than in the steady flow.
2007-08-06