相变微胶囊悬浮液中颗粒润湿性对导热系数的影响

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Abstract The effect of particle wettability on thermal conductivity of microencapsulated phase change suspension was studied experimentally. The wettability of the MPCS, characterized by contact angle between solid particles and carrying fluid, was modified by two selected surfactants, i.e., cetyltrimethyl ammonium bromide (CTAB) and sodium dodecyl sulfate(SDS) combining changing their concentration in the suspensions. Meanwhile, the Hot Disk 2500s thermal analyzer was applied to test the static coefficient of thermal conductivity of the microencapsulated phase change suspension(the mass fraction is 10wt%) and obtain the relation between the thermal conductivity and contact angle. The conclusion are as follows:(i)when the additive amount of surfactants falls into the range of 0%—0.05%, the effect of the CTAB is more significant than SDS. When the mass fraction of surfactants reaches 0.05%, the effect of CTAB and SDS in influencing contact angle is opposite. (ii)the decrease in the contact angle leads to the growth in thermal conductivity for both Maxwell model’s theoretical value and experimental results. When contact angle falls into the range of 45—95°, the Maxwell model’s theoretical results of the thermal conductivity can match experimental value very well, but inversely when the contact angle is smaller than 45°, there is a big gap between the two results. To remove this gap a correction factor “A” which is associated with contact angle is proposed.

Key words： microencapsulated phase change suspension wettability thermal conductivity correction factor

Published: 25 November 2019

CLC number:	TK124
	TQ174

Fund:This work was financially supported by the European Commission’s Seventh Framework Agreement Maricury International Talent Introduction Project (FP7-PEOPLE-2011-IIF-298093), Shanghai Natural Science Foundation (17ZR1411300),Key Science and Technology Research Projects of Shanghai Science and Technology Commission (17DZ1201500).

About author:: Zhongzhu Qiu, professor, born in 1969,received his Ph.D. in 2002 from Tongji University in engineering, focusing on the research of renewable energy utilization and energy conservation technology.

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	QIU Zhongzhu
	LI Shengnan
	WEI Lidong
	QIN Chengfang
	YAO Yuan
	JIANG Weiting
	ZHENG Puyan
	ZHANG Tao

Cite this article:

QIU Zhongzhu,LI Shengnan,WEI Lidong, et al. Effect of Particle Wettability on Thermal Conductivity of Microencapsulated Phase Change Suspension(MPCS)[J]. Materials Reports, 2019, 33(Z2): 623-626.

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http://www.mater-rep.com/EN/ OR http://www.mater-rep.com/EN/Y2019/V33/IZ2/623

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