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Heat transfer in the flow through a bundle of tubes and transitions of the flow

机译:通过一束管的流中的热传递和流的过渡

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摘要

Heat transfer in the flow through a bundle of heated tubes are investigated numerically at Reynolds numbers around which the flow makes a transition from a steady state to an oscillatory one, as a model of micro heat exchanger. It is found that physical quantities such as the Nusselt number and the pressure loss exhibit discontinuous jumps with continuous change in the Reynolds number. The origin of the sudden changes in these physical quantities is identified to come from the existence of multiple stable solutions which leads to hystereses in these quantities.
机译:作为微型换热器的模型,以雷诺数对流过一束加热管的流中的热传递进行了数值研究,雷诺数附近的流从稳态转变为振荡态。发现,诸如雷塞尔数和压力损失之类的物理量在雷诺数连续变化的情况下表现出不连续的跳跃。这些物理量突然变化的根源被确定为存在多个稳定的溶液,这些溶液导致这些量的滞后。

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