Enhancement of Heat Transfer by Stimulated Transition to Turbulence in Natural Convection Boundary Layers on Heated Walls

通过受热壁上自然对流边界层中的受激湍流转变来增强传热

• 批准号: DP0344616
• 负责人: Prof Steven Armfield
• 金额: $ 22.7万
• 依托单位: The University of Sydney
• 依托单位国家: 澳大利亚
• 项目类别: Discovery Projects
• 财政年份: 2003
• 资助国家: 澳大利亚
• 起止时间: 2003-04-01 至 2006-11-13
• 项目状态: 已结题
• 来源: https://dataportal.arc.gov.au/RGS/Web/Grants/DP0344616
• 关键词: Enhancement; Heat; Transfer; Stimulated; Transition

The aim of this project is to increase the heat transfer from heated vertical surfaces to an ambient fluid by stimulating an early transition to turbulence. Such passive heat transfer occurs in heat transfer devices, natural ventilation systems and in many environmental settings. Enhanced heat transfer will greatly improve the performance of these systems. The project will provide the length scales, frequency and amplification rate for the occurence of the secondary spanwise mode that is the primary mechanism for turbulent transition. This will provide guidance for the development of appropriate roughness elements and heating length and time scales.

该项目的目的是通过刺激早期过渡到湍流来增加从加热的垂直表面到周围流体的热传递。这种被动传热发生在传热装置、自然通风系统和许多环境设置中。强化传热将大大提高这些系统的性能。该项目将提供第二展向模态发生的长度尺度、频率和放大率，这是湍流转捩的主要机制。这将为制定适当的粗糙度元素和加热长度和时间尺度提供指导。