储能科学与技术2025，Vol.14Issue(6)：2256-2269,14.DOI:10.19799/j.cnki.2095-4239.2024.1185
相变微胶囊悬浮液自然分层型释冷特性及其参数研究
Natural stratification-based cooling characteristics of a microencapsulated phase-change material suspension and its parametric optimization study
摘要
Abstract
This study exploits the advantages of microencapsulated phase-change material suspensions(MPCMSs),such as excellent flowability,high cooling storage density,and stable thermal behavior during cooling release.By integrating these properties into a natural stratification-based cooling storage system,a three-dimensional transient model of a cylindrical cold storage tank with a pseudo-octagonal diffuser was developed.This study investigates the cooling release and temperature distribution characteristics of MPCMSs with mass fractions of 10%,20%,and 30%under different flow rates.The effects of the diffuser opening count and diameter on the cooling process were analyzed.An optimization strategy employing nozzle-type diffusers was proposed,and the influence of different diffuser structural parameters on the thermocline thickness,temperature fields in small-opening regions,and outflow velocity was examined.The results demonstrate that using MPCMS as the storage medium in a natural stratification-based system creates a thermocline with a steep temperature gradient at the center and smaller gradients at the sides.Higher mass fractions suppress hot-cold fluid mixing and increase the specific heat capacity in the phase-change region,enhancing the cooling release efficiency and temperature control.For 10%and 20%MPCMS mass fractions,increasing the number of openings,selecting a 10 mm diameter diffuser,and using a new nozzle-type diffuser reduce the thermocline thickness and improve cooling performance.However,at 30%mass fraction,variations in the number of openings and the use of nozzle-type diffusers compared with the original diffuser yield negligible differences in performance.This study provides valuable insights for advancing the application of MPCMS in natural stratification-based cooling systems and offers scientific support for optimizing MPCMS energy storage technology.关键词
相变微胶囊悬浮液/蓄冷特性/斜温层/散流器/结构优化Key words
MPCMS/cold storage characteristics/thermocline/diffuser/structural optimization分类
能源与动力引用本文复制引用
程亚龙,梁坤峰,周训,刘苗苗,吕钢欣,宋乂天..相变微胶囊悬浮液自然分层型释冷特性及其参数研究[J].储能科学与技术,2025,14(6):2256-2269,14.基金项目
国家自然科学基金项目(52378094,52376005),河南省科技发展计划项目(222102220033),洛阳市科技发展计划项目(2302035A),航空发动机热环境与热结构工信部重点实验室开放基金(CEPE2020027). （52378094,52376005）
