摘要
对以溴代十六烷(C_(16)H_(33)Br)为相变材料的相变微胶囊悬浮液(MPCMS)作了管内层流恒定热流密度加热条件下的强化传热性能测试和分析。悬浮液质量浓度为5.0%、10.0%和15.8%(文中百分数若无特别指出均为质量分数),整体雷诺数和斯蒂芬数分别在400～1900和1.1～8.8范围内。实验结果表明:实验工况下与水相比,使用MPCMS可降低壁面温度3.9℃,Nu_x数可提高27%～42%,传热实验过程中MPCMS样品压降增加不大,压降可降低26.7%(u_m=1.3m/s),在其输传热综合效果较好。
Microencapsulated phase change material suspension （MPCMS） is a novel fluid that the micro-particles of phase change material （PCM） with micron size are suspended in a conventional single-phase fluid. It can be suggested to serve as a dual-functional medium for thermal energy transport and/or storage, and fluidity during phase change. There are many potentially important applications in the fields of heating, air conditioning, solar heat utilization, temperature control for equipments, and heat exchanging, etc. The laminar forced convection heat transfer characteristics of a kind of microencapsulated phase change material suspensions （MPCMS）, formed by microencapsulating as phase change materi- al, of 5.0 wt %, 10.0 wt %, 15.8 wt % with the constant heat flux （400 〈 Reb 〈 1900 and 1.1 〈 Steb 〈 8.8）, were experimentally investigated in this paper. Under the given conditions and compared with water, the results show that： 1） the wall surface temperature can reduce 3.9℃ ; 2） the local Nu number can increase 27%-42% ; 3） the pressure drop increases slightly at lower mean velocity, and reduces at higher one. The pressure drop can decrease 26.7% （um = 1. 3m/s）. It has good heat transfer and transport performance.
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2009年第8期1018-1022,共5页
Acta Energiae Solaris Sinica
基金
国家自然科学基金(50436020)
关键词
相变微胶囊
相变
层流
强化传热
microencapsulated phase change material
phase change
laminar
heat transfer enhancement
