Non-Steady Impingement of Submerged Jets: Heat Transfer

摘要：提出了利用自振荡喷管非定常冲击射流的新概念。本文从理论和实验两方面对水下射流冲击增强表面换热进行了研究。该概念围绕着改进标准直列射流喷嘴的潜力，使其具有自振荡能力，并有能力在撞击表面上形成振荡边界层。我们相信，这种表面边界层的出现可以用来增加撞击射流的传热。德克萨斯农工大学的红外传热射流撞击装置（HJIF）将用于撞击的实验研究。目的是为了更好地理解这种非稳定现象，以便将其应用于这种物理情况，以改善传热，并获得有关自振荡或共振流的必要启示，以便这些知识将来可用于涉及传质和化学反应的其他表面边界层相互作用条件。

ABSTRACT CTS-9301287 Robert H. Page A new concept to utilize the non-steady impinging jet from a self oscillating nozzle is proposed. Enhancing the surface heat transfer due to a submerged jet impingement is to be studied theoretically and experimentally. The concept centers around the potential of modifying standard in-line jet nozzles such that they become self oscillating and have the ability to force an oscillating boundary layer development on the impingement surface. It is believed that this agitated surface boundary layer occurrence can be exploited to increase the heat transfer from an impinging jet. The Infrared Heat Transfer Jet Impingement Facility (HJIF) at Texas A&M University will be used for the experimental studies of the impingement. The objective will be to obtain a better understanding of this non-steady phenomena in order that it can be applied to this physical situation to improve the heat transfer as well as to gain the necessary enlightenment about self oscillating or resonant flows, such that the knowledge may have future use for additional surface boundary layer interaction conditions involving mass transfer and chemical reactions.