Correlation Analysis of Transient Heat Transfer Characteristics for Air Pre- cooling Aggregate

分类： 动力与电气工程 >> 工程热物理学 提交时间： 2017-03-31 合作期刊: 《热科学学报》

Chaohong ZENG Miao LU Fei TANG Dawei GUAN Wei LI Li FU Tingwu

摘要： In dam works, air precooling of aggregate is a common and effective method to avoid temperature cracks in con- crete structure. In order to offer a reliable design theory for the air precooling process to avoid unreasonable energy consumption, the transient heat transfer characteristics of the aggregate are intensively analyzed. The combined structure of the aggregate and the interstitial space in the hopper is treated as a porous structure, and the space-average method is used to simulate the transient heat transfer process. Simulation results show that size of the hopper and the average air velocity in the cross section have great influence on the transient heat transfer process of the aggregate, while the porosity in the range of 0.4‒0.5 has little influence. Nomograms are abstracted from simulation results, and then correlations of the compared excess temperature are precisely fitted to predict the air precooling transient heat transfer process of the aggregate.

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