相变微胶囊悬浮液圆管内换热特性模拟

doi:10.16085/j.issn.1000-6613.2020-1016

摘要/Abstract

摘要：

相变微胶囊悬浮液在相变过程中具有较大的相变潜热，可以减小温度的变化程度，且比单相流体具有更高的对流换热系数，成为广泛关注的新型热工流体。本文针对相变微胶囊悬浮液在等热流边界条件下的管内层流，根据差示扫描量热法所得到的相变温度范围，采用矩形等效比热容模型，进行了数值模拟分析，并结合以溴代十六烷为相变材料的相变微胶囊悬浮液的实验数据，将数值模拟结果与实验结果对比并进行误差分析。又对在不同质量分数、不同热流密度条件下的对流换热进行研究，分析了不同参数对对流换热强度的影响。并通过拟合得到了相变微胶囊悬浮液圆管内对流换热关联式。然后改变管径、流速条件重新模拟验证该关联式的通用性，其结果表明模拟结果与预测公式高度吻合，该关联式的通用性较好。

关键词: 相变, 计算流体力学, 对流, 传热, 数值模拟

Abstract:

For the microencapsulated phase change materials slurry (MPCMs) having a large latent heat during the phase change period and having a narrower temperature change range and a higher heat convection coefficient than the single-phase fluid, it had become a new thermal fluid of widespread concern. According to the phase change temperature range obtained by DSC, the rectangular equivalent specific heat model was used to numerical simulate the laminar convective heat transfer performances of MPCMs in a tube under constant heat flux. Combined with the experimental data of MPCMs with 1-bromohexadecane as core material, the numerical simulation results were compared with the experimental results, and the error was analyzed. The heat transfer of MPCMs in a tube was investigated under various concentrations of MPCMs and heat flux. The influence of different parameters on the convective heat transfer was analyzed and the correlation of the convective heat transfer with MPCMs in a tube was obtained. And the inner diameter and the velocity was changed to certify the universality of the correlation of convective heat transfer with MPCMs in a tube. The results show that the simulation results are highly consistent with the prediction formula, and the correlation is universal.

Key words: phase change, computational fluid dynamics,CFD, convection, heat transfer, numerical simulation

中图分类号:

TK124

赵敬德, 叶鸿鑫. 相变微胶囊悬浮液圆管内换热特性模拟[J]. 化工进展, 2020, 39(S2): 36-41.

Jingde ZHAO, Hongxin YE. Numerical simulation of convective heat transfer of microencapsulated phase change material slurry in a circular tube[J]. Chemical Industry and Engineering Progress, 2020, 39(S2): 36-41.

图/表 8

图1 圆管模型示意图

表1 相变微胶囊悬浮液的物性参数

项目	密度/kg·m^–3	比热容/J·kg^–1·K^–1	黏度/kg·m^–1·s^–1	潜热/kJ·kg^–1	热导率/W·m^–1·K^–1
水	998.2	4182	0.001003	0	0.6
质量分数5%	1000	4054	0.001795	6.5	0.576
质量分数10%	1002	3926	0.00202	13	0.553
质量分数15.8%	1005	3776	0.00375	20.5	0.527

图2 四种等效比热容的模型

图3 数值模拟正确性验证

图4 温度分布剖面图

图5 不同热流密度MPCMs对流换热模拟结果

图6 不同质量分数MPCMs对流换热模拟结果

图7 改变条件后结果对照图

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