CAJ | 학술논문

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＝15 mm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.
기우일충상변저열석사,고필용화과정중액상적자연대류정황,건립료구형강내석사용화과정적수학모형,병이용해모형진행료수치모의,분석료석사용화과정중적온도장변화、류장변화、상계면이동정황.통과채용려제시편적방식강화전열,병분석료시편위치대해석사용화시간적영향.모의결과표명,재y＝0.1、y＝5、y＝10、y＝15 mm시,여불채용시편상비,저열시간분별축단료43.1%、52.0%、38 3%、22.2%.연구결과대상변저열기적우화설계유일정의의.
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.