混合流动模式下开口腔内热与污染物输运的多态流动特性  

Multiple steady state flow characteristics of heat and pollutant transport within partially opening enclosures under mixing flow schemes

作　　者：赵福云[1,2,3] 王磊[1,2,3] 汪维伟[1,2,3] 蔡阳 刘润哲[1,2,3] ZHAO Fuyun;WANG Lei;WANG Weiwei;CAI Yang;LIU Runzhe(Key Laboratory of Hydraulic Machinery Transients,Ministry of Education,Wuhan University,Wuhan 430072,China;Hubei Key Laboratory of Waterjet Theory and New Technology,Wuhan University,Wuhan 430072,China;School of Power and Mechanical Engineering,Wuhan University,Wuhan 430072,China)

机构地区：[1]武汉大学水力机械过渡过程教育部重点实验室,湖北武汉430072 [2]武汉大学水射流理论与新技术湖北省重点实验室,湖北武汉430072 [3]武汉大学动力与机械学院,湖北武汉430072

出　　处：《武汉大学学报（工学版）》2020年第7期611-618,共8页Engineering Journal of Wuhan University

基　　金：国家自然科学基金项目(编号:51778504);国家重点研发计划专项(编号:2018YFC0705201);国家自然科学基金-中国核工业集团有限公司核技术创新联合基金项目(编号:U1867221)。

摘　　要：对多种稳态流动结构及其相互转变特性的理解有利于在电子设备冷却、食品加工、建筑通风等许多实际应用中实现更有效的热量与物料移除。利用N-S方程建立了双开口腔室内混合通风模式的热与污染物输运模型,通过大量数值模拟结果揭示混合通风过程存在的多态流动行为,即相同边界条件下腔室内呈现不同的流动和热质输运结构。结果表明,热质源位置对多组稳态流动结构的出现起着决定性的作用。当该热质源位于左侧,上行解和下行解彼此重合,而静止状态解则与它们不同,可以用于确定多态流动结构的出现,此时全局Nusselt数和Sherwood数相对变化的最大值分别为30.4%和27.2%,由此可见多态流动的控制与实现对提高腔室内热质输运效率有着巨大的意义;若热质源向右移动,则无法观察到多态流动现象。在高雷诺数下,热量和物料输运速率随着该热质源右移而快速提高。Understandings of multiple steady state flows and their transitional characteristics are beneficial to achieve the more effective removals of heat and pollutant in many practical applications,such as electronic device cooling,food process,building ventilation and so on.The N-S equations are used to build a model of heat and pollutant transportations within a two-opening enclosure under mixing ventilation modes.Through a large number of numerical simulations,the multimodal flow behavior in the mixed ventilation process is revealed,i.e.,different flow and thermal transportation structures appear within the enclosures under the same boundary conditions.Results show that the position of the combining heat and contaminant source has the determining effects on the presence of multiple steady state flows.As this combining source is located at the left,upward and downward solutions coincide with each other,while the stationary state solution varies from them.It can be used to identify the multiple steady state flows where the maximum values of relative variation of global Nusselt and Sherwood numbers are equal to 30.4%and 27.2%,respectively.It is indicated that the control of multiple steady state flows is good for obtaining better performance of heat and pollutant transportations in the enclosures.If this combining source shifts to the right,multiple steady state phenomenon cannot be observed.At high Reynolds number,heat and pollutant transfer rates increase as this combining source moves to the right.

关 键 词：混合对流 热与污染物耦合输运 多态流动 数值模拟 

分 类 号：O368[理学—流体力学]