摘要
引言蓄冷是利用谷电生产冷能并储存起来以满足峰电时空调负荷需求的一种节能技术,能达到移峰填谷、稳定电力需求的目的。冰蓄冷是一种常用蓄冷技术,即利用具有较大凝固潜热水作为相变材料工质。
Surfactant was used in the study to help dispersing TiO2 nanoparticles in deionized water.The effects of different surfactants（sodium dodecyl benzene sulfonate（SDBS）,polyvinylpyrrolidone（PVP）and cetyl trimethyl ammonium bromide（CTAB））on the dispersion stability and solid-liquid phase transition of TiO2-H2O nanofluids were investigated.Surfactants SDBS and PVP significantly enhanced the dispersion stability of TiO2-H2O nanofluid,and reduced its degree of supercooling by about 37.02% and 9.65%,respectively.Whereas,surfactant CTAB showed no effect on improving the dispersion stability of TiO2-H2O nanofluid,and even worse,increased the degree of supercooling of nanofluid by about 6.11%.The adsorption structures of SDBS,PVP and CTAB were analyzed by measuring the adsorbent layer thickness on TiO2 nanoparticles（X-ray photoelectron spectroscopy）.The adsorption structures of surfactants SDBS and PVP were hydrophilic while that of surfactant CTAB was micellar,which could explain the above phenomena.In addition,all three surfactants were found to extend the phase transition time of TiO2-H2O nanofluid due to the decrease in the thermal conductivity of nanofluid.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2013年第9期3324-3330,共7页
CIESC Journal
基金
国家自然科学基金项目(51106031)
国家自然科学基金-广东联合资助项目(U0934006)
广东省教育部产学研结合项目(2011B090400374)~~
关键词
水基纳米流体
表面活性剂
吸附结构
过冷度
water-base nanofluid
surfactant
adsorption structure
degree of supercooling
