低速流动下的双层中空板强化蓄热研究  

Enhanced Heat Storage of Double Hollow Plates at Low-speed Water Flow

作　　者：任德志 张皓男 宫元娟[1] 王国峰 REN De-zhi;ZHANG Hao-nan;GONG Yuan-juan;WANG Guo-feng(College of Engineering,Shenyang Agricultural University,Shenyang 110161,China;College of Information and Electrical Engineering,Shenyang Agricultural University,Shenyang 110161,China;College of Energy and Power,Shenyang Institute of Engineering,Shenyang 110136,China)

机构地区：[1]沈阳农业大学工程学院,沈阳110161 [2]沈阳农业大学信息与电气工程学院,沈阳110161 [3]沈阳工程学院能源与动力学院,沈阳110136

出　　处：《沈阳农业大学学报》2022年第5期553-561,共9页Journal of Shenyang Agricultural University

基　　金：国家自然科学基金项目(51405311);辽宁省重点研发指导计划项目(2019JH8/10200019);辽宁省教育厅重点项目(LSNZD201707)。

摘　　要：为了探索低速流动下黏性的水对日光温室蓄热结构换热的影响,构建低速水流动液膜换热数学模型,以带夹层的双层中空板蓄热系统结构为研究对象,采用理论推导与数值分析方法,对夹层内完全充满水的数学模型开展研究,验证数值方法的适用性和准确性;通过对夹层内存在气水交界面和水层与底板间存在黏性作用液体薄膜数学模型在蓄热过程中的换热量的比较,获得低速水流动下有/无液膜模型中空板蓄热结构的蓄热差别,验证低速流动下水流黏性作用对换热的影响;最后通过建立底面带凸起的强化换热液膜模型,增强低速流动下水的换热能力,提高强化换热效果。研究表明:在水流速度较小情况下,夹层板内呈现气水交接的流动特性,当考虑水的黏性作用,引入液体薄膜流强化换热技术,比无液体薄膜作用的蓄热结构的换热效果增强;在液体薄膜流作用下的圆柱凸台的强化换热结构可进一步提升系统换热能力,且流速越小,其换热效果越强。在6月21日13∶00,天气晴朗,在北纬48°,东经123°,太阳光照在1m^(2)的蓄热面积上。结果显示,当进口速度V_(0)=0.3m∙s^(-1)时,水流出口温升为0.605℃,水层换热量为415.66W。研究结果可为日光温室蓄热系统的进一步研究提供理论基础。In order to explore the influence of low speed viscous water in the heat storage structure of solar greenhouse on heat transfer,the theoretical derivation and numerical analysis were carried out to establish the mathematical model of heat transfer of liquid film in the interlayer,fully filled with low speed water flow,of the double-layer hollow plate heat storage system,water to verify the applicability and accuracy of the numerical method;according to the comparison the heat transfer of the mathematical models between the liquid film with the air-water interface in the interlayer and the viscous water film between the water layer and the bottom plate during the heat storage process,the difference of heat storage structure between the hollow plate with and without liquid film at low speed water flow was obtained,and the effect of water viscosity on heat transfer was verified;a more reasonable model for enhanced liquid film heat transfer with small cylinder boss on surface of the bottom plate was established to enhance the heat transfer capability of low-speed flowing water and improve the heat transfer.The results showed that the heat transfer capacity of the heat storage structure could be enhanced than that of the structure without liquid film,when there was air-water interface flow in the sandwich plate at low speed water flow,and when the viscous effect of water was taken into account,and the technology of heat transfer enhancement by liquid film flow was introduced;the enhanced heat transfer structure with the small cylinder boss under the action of liquid film flow could further enhance the heat transfer capacity of the system,and the lower the flow speed,the stronger the heat transfer effect.The results showed that,at 13∶00,June 21,sunny,at 48°N,123°E,on 1m^(2) of heat storage area,when the incoming water speed at V_(0)=0.3m∙s^(-1),the water temperature rise at the outlet was 0.605℃,and the heat transfer of the water layer is 415.66W.The result may provide reference for the study on heat storage sy

关 键 词：液体薄膜流 蓄热结构 强化换热 液膜厚度 

分 类 号：TK0[动力工程及工程热物理]