摘要
基于CFD共轭传热技术,分别针对恒温箱内部流场在无风扇自然对流以及有风扇强制对流下的两种不同情形进行数值仿真,研究外壁高度、外壁传热系数、加热管功率和翅片材料四个参数对恒温箱内部流场的影响,并针对温场均匀性进行参数优化分析。结果表明,恒温箱外壁高度越高,内部温差越大;选择密度与比热容的乘积较小的材料做翅片可使加热时间更短,同时温差更小;自然对流下,观察段40cm间的温度均匀性往往超过2℃,且稳定时间很短;引入风扇的强制对流后,温度场的均匀性得到了很好的改善,恒温箱内的温差明显变小,观察段40cm间的温度均匀性最优能控制在0.02℃以内。CFD共轭传热技术可对恒温箱流场进行有效分析,为恒温箱的研究与应用提供一定的借鉴意义。
The internal flow field of the thermotank had been simulated under the natural convection and the forced convection respectively with and without fan based on CFD conjugate heat transfer technology.The influence of the thermotank height,the heat transfer coefficient of the thermotank wall,the power of the heating tube and the fin material on the internal flow field of the thermotank had been studied,and the parameter optimization analysis had been further carried out according to the uniformity of the temperature field.The results showed that the internal temperature difference increased with the increase of the thermotank height.The fin material with smaller product value of density and specific heat capacity could effectively decrease the heating time and temperature difference.The temperature uniformity among the 40 cm observation section mostly exceeded 2℃with extremely short holding time under natural convection,while the uniformity of the temperature field had been obviously improved under the forced convection induced by the fan where the temperature difference had been significantly reduced and the temperature uniformity among the 40 cm observation section had reached 0.02℃in the optimal.Additionally,CFD conjugate heat transfer technology can effectively analyze the flow field of the thermotank and might provide certain reference for the research and application of the thermotank.
作者
王灿
刘贝贝
张忠立
WANG Can;LIU Beibei;ZHANG Zhongli(Shanghai Institute of Measurement and Testing Technology,Shanghai 201203,China)
出处
《中国测试》
CAS
北大核心
2021年第S01期149-155,共7页
China Measurement & Test
基金
上海市市场监督管理局科研计划项目(2021-07)
