粒数衡算与多相流耦合求解刮削制冰的晶粒特性

doi:10.11949/j.issn.0438-1157.20161399

化工学报 ›› 2016, Vol. 67 ›› Issue (S2): 128-135.DOI: 10.11949/j.issn.0438-1157.20161399

粒数衡算与多相流耦合求解刮削制冰的晶粒特性

贾雪迎¹, 梁坤峰¹, 李盈盈¹, 袁争印¹, 阮春蕾², 王林³, 董彬¹, 芮胜军¹, 李健¹

1. 河南科技大学制冷与空调技术研究所, 河南洛阳 471003;
2. 河南科技大学数学与统计学院, 河南洛阳 471003;
3. 河南科技大学土木学院, 河南洛阳 471003

收稿日期:2016-10-08 修回日期:2016-10-18 出版日期:2016-12-30 发布日期:2016-12-30
通讯作者: 梁坤峰, 王林
基金资助:
国家自然科学基金项目（U1304521，11402078）；河南省高校科技创新人才支持计划项目（16HASTIT027）。

Crystallization simulation of scraped surface freezer based on coupling model of population balance and multiphase flow

JIA Xueying¹, LIANG Kunfeng¹, LI Yingying¹, YUAN Zhengyin¹, RUAN Chunlei², WANG Lin³, DONG Bin¹, RUI Shengjun¹, LI Jian¹

1. Institute of Refrigeration and Air Conditioning Technology, Henan University of Science and Technology, Luoyang 471003, Henan, China;
2. Institute of Mathematics and Statistics, Henan University of Science and Technology, Luoyang 471003, Henan, China;
3. Institute of Civil Engineering, Henan University of Science and Technology, Luoyang 471003, Henan, China

Received:2016-10-08 Revised:2016-10-18 Online:2016-12-30 Published:2016-12-30
Supported by:
supported by the National Natural Science Foundation of China(U1304521,11402078) and the University Science and Technology Innovative Talents Supporting Program in Henan Province(16HASTIT027).

摘要/Abstract

摘要：

在考虑晶粒成核、生长、聚并和破碎的情况下，采用分组法求解粒数衡算方程，通过耦合粒数衡算与多相流方程，建立了多尺度的结晶模型，模拟了表面刮削式制冰装置内水的动态结晶过程，获得不同温度、刮削速度、制冰时间等外界条件下晶粒数密度分布、云图等信息，分析了外界宏观条件对水的动态结晶过程的影响。结果表明：由于碰撞引起的晶粒聚并和破碎使得晶粒的尺寸分布更为集中和均匀；在过冷温差（流体局部温度与水的相变温度差值）不大于20℃，刮削速度不大于10 r·s^-1范围内，降低壁面温度、增加刮削速度可以加速水的结晶与生长。

关键词: 相变, 多相流, 模型, 粒数衡算, 结晶, 数密度, 聚并和破碎

Abstract:

By discretizing the population equation into different size groups, a method was established for solving the population balance equation coupled with multiphase flow field.A computational fluid dynamics simulation with population balance model was performed for the scraped surface freezer.The algorithm considering nucleation rate, growth rate, crystal aggregation and breakage was used for describing the water dynamic ice-making crystallization process.By using this model, the key role of crystal aggregation and breakage was reappraised, and the ice crystals number density distributions were obtained in the scraped surface freezer.Then the influence of temperature, scraping speed and the crystallization time on the dynamic crystallization process of the water was studied.The results show that the crystal size distribution would be more centralized and uniform with the crystals aggregation and breakage; if the supercold temperature difference is less than 20℃ and the scraping speed is not more than 10 r·s^-1, the crystallization process would be accelerated by reducing the wall temperature or increasing the scraping speed.

Key words: phase change, multiphase flow, model, population balance, crystallization, number density, aggregation and breakage

中图分类号:

TK125

贾雪迎, 梁坤峰, 李盈盈, 袁争印, 阮春蕾, 王林, 董彬, 芮胜军, 李健. 粒数衡算与多相流耦合求解刮削制冰的晶粒特性[J]. 化工学报, 2016, 67(S2): 128-135.

JIA Xueying, LIANG Kunfeng, LI Yingying, YUAN Zhengyin, RUAN Chunlei, WANG Lin, DONG Bin, RUI Shengjun, LI Jian. Crystallization simulation of scraped surface freezer based on coupling model of population balance and multiphase flow[J]. CIESC Journal, 2016, 67(S2): 128-135.

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粒数衡算与多相流耦合求解刮削制冰的晶粒特性

Crystallization simulation of scraped surface freezer based on coupling model of population balance and multiphase flow

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