Al2O3-H2O纳米流体池内沸腾强化传热实验的曲面响应优化  

Surface Response Optimization of Boiling Heat Transfer Enhancement Experiment in Al2O3-H2O Nanofluid Pool

作　　者：雷佳杰 卿山[1] 陈鹏飞[1] 张禄 廖稷邦 张迎 LEI Jia-jie;QING Shan;CHEN Peng-fei;ZHANG Lu;LIAO Ji-bang;ZHANG Ying(Kunming University of Science and Technology,School of Energy and Power Engineering,Kunming 650093,China)

机构地区：[1]昆明理工大学冶金与动力工程学院,云南昆明650000

出　　处：《节能技术》2020年第3期206-212,共7页Energy Conservation Technology

基　　金：国家自然科学基金资助项目(51966005,51566005)。

摘　　要：为了提高余热回收效率,强化沸腾换热。在池内沸腾强化换热实验中运用Al2O3-H2O纳米流体,研究了Al2O3纳米流体浓度、工件壁厚、热流密度对强化率的影响及最优强化条件。单因素分析结果显示,随着Al2O3纳米流体浓度、热流密度增大,强化率先增大后减小;随着工件壁厚增大,强化率逐渐减小。在单因素分析结果上,采用响应曲面法中Box-Behnken Design(BBD)模型对池内沸腾传热条件优化,得出三个因素对强化率的影响大小为:Al2O3纳米流体浓度>工件壁厚>热流密度。并且Al2O3纳米流体浓度与热流密度交互作用对强化率最为显著。通过曲面响应拟合最佳实验条件为:质量浓度1.2 wt%、热流密度83543 W/m^2、壁厚0.45 mm,模拟结果强化率为107%,实验测得最优条件下强化率为106%,与预测接近。In order to improve the efficiency of waste heat recovery and enhance the boiling heat transfer.The effects of Al2O3-H2O nanofluid concentration,workpiece wall thickness and heat flux density on the strengthening rate and the optimal strengthening conditions were studied in the pool boiling heat transfer experiment.The results of single factor analysis showed that with the increase of Al2O3 nanofluid concentration and heat flux density,the strengthening first increased and then decreased.With the increase of the wall thickness,the strengthening rate decreases.Based on the single factor analysis results,the Box Behnken Design(BBD)model in response surface method is used to optimize the boiling heat transfer conditions in the pool.The results show that the influence of three factors on the strengthening rate is:Al2O3 nanofluid concentration>workpiece wall thickness>heat flow density.Moreover,the interaction between Al2O3 nanofluid concentration and heat flux density is the most significant.The best experimental conditions are as follows:concentration 1.2 wt%,heat flux 83543 W/m^2,wall thickness 0.45 mm.The simulation results show that the strengthening rate is 107%,and the best experimental conditions are 106%,which is close to the prediction.

关 键 词：纳米流体 池内核态沸腾 强化传热 曲面响应 水基氧化铝 BBD模型 

分 类 号：TK019[动力工程及工程热物理]