一种余热利用相变石蜡储热过程的数值模拟  

Numerical Simulation of the Heat Storage Process of a Waste Heat Utilization-oriented Phase-change Paraffin

作　　者：邹得球[1] 肖睿[2] 宋文吉[2] 冯自平[2] 

机构地区：[1]中国科学院研究生院,北京100039 [2]中国科学院广州能源研究所,广东广州510640

出　　处：《热能动力工程》2010年第1期77-81,共5页Journal of Engineering for Thermal Energy and Power

基　　金：国家自然科学基金-广东联合基金资助项目(U0634005);国家863计划基金资助项目(2006AA05Z254);国家自然科学基金资助项目(50906089)

摘　　要：基于一种相变储热石蜡,考虑熔化过程中液相的自然对流情况,建立了矩形腔内石蜡熔化过程的数学模型,并利用该模型进行了数值模拟,分析了石蜡熔化过程中的温度场变化、流场变化、相界面移动情况。通过采用铝制翅片的方式强化传热,并分析了翅片位置对该石蜡熔化时间的影响。模拟结果表明,在y=0.1、y=5、y=10、y=15mm时,与不采用翅片相比,储热时间分别缩短了43.1%、52.0%、38.3%、22.2%。研究结果对相变储热器的优化设计有一定意义。Based on a kind of phase-change heat storage paraffin and with its liquid phase natural convection during its melting process being taken into consideration,a mathematical model for the paraffin melting process inside a rectangular cavity was established and used to perform a numerical simulation. In addition,the change of the temperature and flow field,and the shift of the interphase boundary during the paraffin melting process was analyzed. The heat transfer was intensified by utilizing an aluminium-made fins and the influence of the fin location on the paraffin melting time was also analyzed. The simulation results show that when the location of the fins y=0.1 mm,y=5 mm,y=10 mm and y=15 mm,the heat storage time was shortened by 43.1%,52.0%,38.3% and 22.2% respectively as compared with the case when the fins are not used. The research results are of definite significance to the optimized design of a phase-change heat accumulator.

关 键 词：石蜡 相变 强化传热 余热利用 数值模拟 

分 类 号：TK02[动力工程及工程热物理] O373[理学—流体力学]