湍流热对流调制及其机理的研究现状和展望

Reviews and prospects of boundary modulation in turbulent thermal convection

湍流热对流现象广泛存在于自然界和实际工程应用中,Rayleigh-Bénard(RB)系统是研究湍流热对流问题的经典模型。湍流传热的调制及其机理问题是湍流研究的重点。在经典RB系统中,上下板附近的温度边界层与系统传热关系密切,边界层内热湍流结构(羽流)的生成演化特性直接决定着系统传热效率。目前的调制策略主要通过改变上下板边界的几何型形状或改变温度边界条件来控制RB系统的对流强度,实现增强或抑制系统传热。本文主要从边界几何调制、边界温度时间调制和边界温度空间调制三个方面分别介绍和讨论了近年来有关湍流热对流调制及其机理研究方面的最新进展,并在最后提出了针对该方向的一些思考和展望。

Turbulent convection is ubiquitous in nature and many industrial applications. RayleighBénard (RB) convection has long been proposed as a classical system to study buoyancy-driven convection.Recently, the modulation of convective heat transfer and its mechanism have been received attentions. In RB convection, the convective heat transfer is related to the characteristics of the thermal boundary layer and the dynamics of thermal plumes. The strategies of modulation including changing the geometry of the walls and the temperature boundary conditions are proposed, in order to achieve the enhancement or suppression of heat transport efficiency. This paper presents an overview of recent advances on the boundary modulation in turbulent convection, including geometrical modulation, spatial and temporal temperature modulations. Finally, the outlook of the heat transport modulation is given.