振动驱动热对流研究进展

Overview of recent developments in thermal vibrational convection

工程应用和自然界中的流动不可避免地受到外部振动激励的影响.当振动作用于含有温度梯度的流体系统时,高频振动激励会在系统内部产生平均流动,实现或者控制热量输运.这种由振动激励驱动的热对流现象被称为振动热对流.振动激励一般具有明显的周期性,提供了一种特殊的热对流驱动机制.这种驱动机制不仅为微重力环境下实现热量和质量的输运提供了新的方法,而且可以作为增强浮力驱动热对流系统传热的有效手段.主要从微重力环境、地表重力环境和多相流体中振动驱动热对流这3个方面,综述并探讨振动热对流中流动结构和传热特性的若干研究新方向及其进展,并对今后的研究方向进行展望.

External vibrational influence is inevitable in engineering applications and in nature.When vibration acts on a fluid system subjected to a temperature gradient,time-averaged vibration-induced fluctuating flows induce streaming convective flows,which transport matter and heat.This type of vibration-induced time-averaged convective flow is called thermal vibrational convection.Vibration with unsteady periodic properties provides a new mechanism for generating convective flows.The application of thermal vibrational convection not only achieves heat and mass transfer in micro gravity but also introduces a new approach to actively control the heat transfer of buoyancy-driven convection.This paper presents an overview of recent advances in thermal vibrational convection in micro gravity under terrestrial conditions and the vibrational effects on multi phase flows.Finally,the outlook of thermal vibrational convection is provided.