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

该项目的目的是通过刺激向湍流的早期转变来增加从加热的垂直表面到环境流体的热传递。这种被动热传递发生在热传递设备、自然通风系统和许多环境设置中。强化换热将大大提高这些系统的性能。该项目将为二次跨展模的发生提供长度尺度、频率和放大率，这是湍流转换的主要机制。这将为开发适当的粗糙度元素以及加热长度和时间标尺提供指导。

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.