Enhancing heat capacity of colloidal suspension using nanoscale encapsulated phase-change materials for heat transfer.
This paper describes a new method to enhance the heat-transfer property of a single-phase liquid by adding encapsulated phase-change nanoparticles (nano-PCMs), which absorb thermal energy during solid-liquid phase changes. Silica-encapsulated indium nanoparticles and polymer-encapsulated paraffin (wax) nanoparticles have been made using colloid method, and suspended into poly-alpha-olefin (PAO) and water for potential high- and low-temperature applications, respectively. The shells prevent leakage and agglomeration of molten phase-change materials, and enhance the dielectric properties of indium nanoparticles. The heat-transfer coefficients of PAO containing indium nanoparticles (30% by mass) and water containing paraffin nanoparticles (10% by mass) are 1.6 and 1.75 times higher than those of corresponding single-phase fluids. The structural integrity of encapsulation allows repeated use of such nanoparticles for many cycles in high heat generating devices.
Hong
Yan
Y
NanoScience Technology Center and Department of Mechanical, Materials and Aerospace Engineering, University of Central Florida, Orlando, Florida 32826, USA.
Ding
Shujiang
S
Wu
Wei
W
Hu
Jianjun
J
Voevodin
Andrey A
AA
Gschwender
Lois
L
Snyder
Ed
E
Chow
Louis
L
Su
Ming
M
D003102:Colloids / Q000737:chemistry*; D004867:Equipment Design; D006358:Hot Temperature; D007204:Indium / Q000737:chemistry; D008422:Materials Testing; D053768:Metal Nanoparticles / Q000737:chemistry; D053758:Nanoparticles / Q000737:chemistry*; D049329:Nanostructures / Q000737:chemistry*; D036103:Nanotechnology / Q000379:methods; D010232:Paraffin / Q000737:chemistry; D011108:Polymers / Q000737:chemistry; D012822:Silicon Dioxide / Q000737:chemistry; D013696:Temperature
D003102:Colloids; D011108:Polymers; D007204:Indium; D012822:Silicon Dioxide; D010232:Paraffin