Browse Publications Technical Papers 2006-01-2175
2006-07-17

Nanofluids as Working Media for Loop Heat Pipes 2006-01-2175

Nanofluids have been recently investigated as new working media for two-phase thermal control systems. However, conflicting reports have emerged, in which contradictory effects of the nanoparticles on the working performance of heat pipes have been described. Some studies have shown that gold or silver nanoparticles significantly improve heat transfer performances of heat pipes. Other studies have provided evidence that metal nanoparticles have no particular effect. This study is aimed at determining whether nanofluids are good candidates as heat carriers in a Loop Heat Pipe (LHP) system. Here, a nanofluid consisting of well-characterized citrate-stabilized gold nanoparticles in water is examined. The metallic nanoparticles are functionalized with citrate ligands in order to be soluble and stable in water at room temperature. An LHP hardware set-up was developed for this investigation. There are transparent elements in the LHP compensation chamber, which enable the visualizing of the fluid flow and phase behaviors. The experimental tests with the gold nanofluid have shown the effects of nanoparticles on the LHP operation. It was found that the nanofluid was not stable at high temperatures in the metallic casing, and after 48-hours tests, there was no physical evidence of the presence of gold nanoparticles remaining in the LHP working fluid. The LHP increased performance may be due to the positive influence of the nanofluid & small amount of sodium citrate present in solution (i.e. the nanoparticle stabilizing agent) on the wettability of the wick.

SAE MOBILUS

Subscribers can view annotate, and download all of SAE's content. Learn More »

Access SAE MOBILUS »

Members save up to 18% off list price.
Login to see discount.
Special Offer: Download multiple Technical Papers each year? TechSelect is a cost-effective subscription option to select and download 12-100 full-text Technical Papers per year. Find more information here.
We also recommend:
TECHNICAL PAPER

A Laboratory Setup for Observation of Loop Heat Pipe Characteristics

2006-01-2170

View Details

TECHNICAL PAPER

Two-Parameter Equations of State for ARPCS Applications

2001-01-2251

View Details

TECHNICAL PAPER

The Porous Plate Sublimator as the X-38/CRV (Crew Return Vehicle) Orbital Heat Sink

1999-01-2004

View Details

X