Heat transfer frequency response of a cylinder in pulsating cross flow

脉动横流中圆柱体的传热频率响应

• 批准号: 253709273
• 负责人: Professor Wolfgang Polifke, Ph.D.
• 金额: --
• 依托单位: Lehrstuhl für Thermofluiddynamik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2014
• 资助国家: 德国
• 起止时间: 2013-12-31 至 2015-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/253709273?language=en
• 关键词: Heat; transfer; frequency; response; cylinder

The heat transfer of a cylinder in cross flow is of fundamental as well as applied interest in thermo-fluidmechanics. The dynamics of heat transfer under pulsating flow conditions - first investigated by Lighthill in 1954 - poses some very intriguing questions. The applicant and co-workers have determined in preliminary studies the frequency response of heat transfer by a combination of computational fluid dynamics and system identification. It was found that the dynamics are governed by the interaction of various response mechanisms with different time lags, which by superposition account for several non-trivial features of the heat transfer frequency response. The objective of the proposed research is to carry out an in-depth, comprehensive analysis of the dynamic response of shear stress and heat transfer of a cylinder in cross flow. First, identification quality is to be improved through advanced identification schemes and alternative model structures. Then the following open questions shall be addressed: dynamics at low Reynolds numbers, phase of the frequency response at high Strouhal numbers, limitations of Lighthill's analysis.

横流中圆柱体的传热问题是热流体力学中的一个重要问题。在脉动流条件下的传热动力学-由Lighthill于1954年首次研究-提出了一些非常有趣的问题。申请人及其同事在初步研究中通过计算流体动力学和系统识别的组合确定了热传递的频率响应。有人发现，动态是由各种响应机制与不同的时间滞后的相互作用，这是由叠加帐户的传热频率响应的几个非平凡的功能。本文的研究目的是对横流中圆柱体的剪应力和传热的动态响应进行深入、全面的分析。首先，通过先进的识别方案和替代模型结构来提高识别质量。然后，应解决以下开放性问题：在低雷诺数的动态，在高斯特劳哈尔数的频率响应的相位，莱特希尔的分析的局限性。

项目成果

Identification of the heat transfer frequency response in pulsating laminar and subcritical flow across a cylinder

• DOI: 10.1088/1742-6596/745/3/032055
• 发表时间: 2016-09
• 期刊: Journal of Physics: Conference Series
• 作者: A. Witte;A. Cabrera;W. Polifke

Dynamics of unsteady heat transfer in pulsating flow across a cylinder

• DOI: 10.1016/j.ijheatmasstransfer.2017.02.072
• 发表时间: 2017-06
• 期刊: International Journal of Heat and Mass Transfer
• 影响因子: 5.2
• 作者: A. Witte;W. Polifke