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Pulsating and synthetic impinging jets

机译:脉冲和合成撞击射流

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This is the second part of a survey summarizing authors' research over a period of two decades on enhancing impinging jet heat and/or mass transfer by periodic unsteadiness of nozzle flow rate. The first part, Tesar and Travnicek (2004 b), identified the reasons why pulsation does not always improve the transfer rate: the pulses do not reach up to the wall. The authors nevertheless demonstrate a transfer rate improvement, but in flows with inherent instability found in annular impinging jet. The excitation there causes a topological metamorphosis (reversal of flow character). Also in the extreme case of the synthetic (zero time-mean flow) jets the authors demonstrated a substantial improvement with the annular nozzle. The new approaches presented in the paper offer increased performance of drying and heating/cooling systems, in particular in microdevices with otherwise low or absent levels of natural jet turbulence.
机译:这是调查的第二部分,概述了作者在过去的二十年中的研究成果,该研究是通过喷嘴流量的周期性不稳定来增强喷射热和/或传质的方法。第一部分,Tesar和Travnicek(2004 b),指出了脉动不能总是提高传输速率的原因:脉冲无法到达壁。尽管如此,作者们证明了传输速率的提高,但是在环形撞击射流中发现具有固有不稳定性的流中。那里的激发导致拓扑变态(流动特性反转)。同样在合成喷嘴(零平均时间流量)的极端情况下,作者证明了环形喷嘴的实质性改进。本文介绍的新方法可提高干燥和加热/冷却系统的性能,特别是在自然射流湍流程度较低或不存在的微型设备中。

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