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Particle shape effect on heat transfer performance in an oscillating heat pipe.

Ji Y, Wilson C, Chen HH, Ma H - Nanoscale Res Lett (2011)

Bottom Line: A binary mixture of ethylene glycol (EG) and deionized water (50/50 by volume) was used as the base fluid for the OHP.Experimental results show that the alumina nanoparticles added in the OHP significantly affect the heat transfer performance and it depends on the particle shape and volume fraction.In addition, even though previous research found that these alumina nanofluids were not beneficial in laminar or turbulent flow mode, they can enhance the heat transfer performance of an OHP.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Mechanical and Aerospace Engineering, University of Missouri, Columbia, MO 65211, USA. mah@missouri.edu.

ABSTRACT
The effect of alumina nanoparticles on the heat transfer performance of an oscillating heat pipe (OHP) was investigated experimentally. A binary mixture of ethylene glycol (EG) and deionized water (50/50 by volume) was used as the base fluid for the OHP. Four types of nanoparticles with shapes of platelet, blade, cylinder, and brick were studied, respectively. Experimental results show that the alumina nanoparticles added in the OHP significantly affect the heat transfer performance and it depends on the particle shape and volume fraction. When the OHP was charged with EG and cylinder-like alumina nanoparticles, the OHP can achieve the best heat transfer performance among four types of particles investigated herein. In addition, even though previous research found that these alumina nanofluids were not beneficial in laminar or turbulent flow mode, they can enhance the heat transfer performance of an OHP.

No MeSH data available.


Related in: MedlinePlus

Particle shape effect on (a), (b) temperature differenceand (c), (d) thermal resistance (operating temperature: 20°C, filling ratio: 50%, BF: base fluid, P1: platelet, P2: blade, P3: cylinder, and P4: brick).
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Figure 3: Particle shape effect on (a), (b) temperature differenceand (c), (d) thermal resistance (operating temperature: 20°C, filling ratio: 50%, BF: base fluid, P1: platelet, P2: blade, P3: cylinder, and P4: brick).

Mentions: Figures 3 and 4 illustrate the particle shape effect on the OHP heat transfer performance at the operating temperature of 20 and 60°C respectively. In these figures, P1, P2, P3 and P4 stand for platelet-like, blade-like, cylinder-like, and brick-like shape particles, respectively, and V03, V1, V3, and V5 stand for the volume fraction of 0.3, 1, 3, and 5%, respectively. So, the combination of P and V can stand for different nanofluids. BF means the working fluid is the base fluid without any particles.


Particle shape effect on heat transfer performance in an oscillating heat pipe.

Ji Y, Wilson C, Chen HH, Ma H - Nanoscale Res Lett (2011)

Particle shape effect on (a), (b) temperature differenceand (c), (d) thermal resistance (operating temperature: 20°C, filling ratio: 50%, BF: base fluid, P1: platelet, P2: blade, P3: cylinder, and P4: brick).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211362&req=5

Figure 3: Particle shape effect on (a), (b) temperature differenceand (c), (d) thermal resistance (operating temperature: 20°C, filling ratio: 50%, BF: base fluid, P1: platelet, P2: blade, P3: cylinder, and P4: brick).
Mentions: Figures 3 and 4 illustrate the particle shape effect on the OHP heat transfer performance at the operating temperature of 20 and 60°C respectively. In these figures, P1, P2, P3 and P4 stand for platelet-like, blade-like, cylinder-like, and brick-like shape particles, respectively, and V03, V1, V3, and V5 stand for the volume fraction of 0.3, 1, 3, and 5%, respectively. So, the combination of P and V can stand for different nanofluids. BF means the working fluid is the base fluid without any particles.

Bottom Line: A binary mixture of ethylene glycol (EG) and deionized water (50/50 by volume) was used as the base fluid for the OHP.Experimental results show that the alumina nanoparticles added in the OHP significantly affect the heat transfer performance and it depends on the particle shape and volume fraction.In addition, even though previous research found that these alumina nanofluids were not beneficial in laminar or turbulent flow mode, they can enhance the heat transfer performance of an OHP.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Mechanical and Aerospace Engineering, University of Missouri, Columbia, MO 65211, USA. mah@missouri.edu.

ABSTRACT
The effect of alumina nanoparticles on the heat transfer performance of an oscillating heat pipe (OHP) was investigated experimentally. A binary mixture of ethylene glycol (EG) and deionized water (50/50 by volume) was used as the base fluid for the OHP. Four types of nanoparticles with shapes of platelet, blade, cylinder, and brick were studied, respectively. Experimental results show that the alumina nanoparticles added in the OHP significantly affect the heat transfer performance and it depends on the particle shape and volume fraction. When the OHP was charged with EG and cylinder-like alumina nanoparticles, the OHP can achieve the best heat transfer performance among four types of particles investigated herein. In addition, even though previous research found that these alumina nanofluids were not beneficial in laminar or turbulent flow mode, they can enhance the heat transfer performance of an OHP.

No MeSH data available.


Related in: MedlinePlus