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Migration of carbon nanotubes from liquid phase to vapor phase in the refrigerant-based nanofluid pool boiling.

Peng H, Ding G, Hu H - Nanoscale Res Lett (2011)

Bottom Line: The refrigerants include R113, R141b and n-pentane.The experimental results indicate that the migration ratio of carbon nanotube increases with the increase of the outside diameter or the length of carbon nanotube.A model for predicting the migration ratio of carbon nanotubes in the refrigerant-based nanofluid pool boiling is proposed, and the predictions agree with 92% of the experimental data within a deviation of ±20%.

View Article: PubMed Central - HTML - PubMed

Affiliation: Institute of Refrigeration and Cryogenics, Shanghai Jiaotong University, 800 Dongchuan Road, Shanghai 200240, China. glding@sjtu.edu.cn.

ABSTRACT
The migration characteristics of carbon nanotubes from liquid phase to vapor phase in the refrigerant-based nanofluid pool boiling were investigated experimentally. Four types of carbon nanotubes with the outside diameters from 15 to 80 nm and the lengths from 1.5 to 10 μm were used in the experiments. The refrigerants include R113, R141b and n-pentane. The oil concentration is from 0 to 10 wt.%, the heat flux is from 10 to 100 kW·m-2, and the initial liquid-level height is from 1.3 to 3.4 cm. The experimental results indicate that the migration ratio of carbon nanotube increases with the increase of the outside diameter or the length of carbon nanotube. For the fixed type of carbon nanotube, the migration ratio decreases with the increase of the oil concentration or the heat flux, and increases with the increase of the initial liquid-level height. The migration ratio of carbon nanotube increases with the decrease of dynamic viscosity of refrigerant or the increase of liquid phase density of refrigerant. A model for predicting the migration ratio of carbon nanotubes in the refrigerant-based nanofluid pool boiling is proposed, and the predictions agree with 92% of the experimental data within a deviation of ±20%.

No MeSH data available.


Related in: MedlinePlus

TEM photographs of CNTs. (a) CNT#1; (b) CNT#2; (c) CNT#3; (d) CNT#4.
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Figure 1: TEM photographs of CNTs. (a) CNT#1; (b) CNT#2; (c) CNT#3; (d) CNT#4.

Mentions: The objective of category 1 is to investigate the influences of CNTs physical dimension on the migration characteristics of CNTs. Four types of CNTs with different physical dimensions (numbered as CNT#1, CNT#2, CNT#3, and CNT#4) produced by the chemical vapor deposition method are used in these test conditions. The physical dimensions of these four types of CNTs are shown in Table 2 and the TEM (transmission electron microscope) photographs of the CNTs are shown in Figure 1. In these test conditions, the other influence factors including the refrigerant type, oil concentration, heat flux and initial liquid-level height are fixed.


Migration of carbon nanotubes from liquid phase to vapor phase in the refrigerant-based nanofluid pool boiling.

Peng H, Ding G, Hu H - Nanoscale Res Lett (2011)

TEM photographs of CNTs. (a) CNT#1; (b) CNT#2; (c) CNT#3; (d) CNT#4.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211276&req=5

Figure 1: TEM photographs of CNTs. (a) CNT#1; (b) CNT#2; (c) CNT#3; (d) CNT#4.
Mentions: The objective of category 1 is to investigate the influences of CNTs physical dimension on the migration characteristics of CNTs. Four types of CNTs with different physical dimensions (numbered as CNT#1, CNT#2, CNT#3, and CNT#4) produced by the chemical vapor deposition method are used in these test conditions. The physical dimensions of these four types of CNTs are shown in Table 2 and the TEM (transmission electron microscope) photographs of the CNTs are shown in Figure 1. In these test conditions, the other influence factors including the refrigerant type, oil concentration, heat flux and initial liquid-level height are fixed.

Bottom Line: The refrigerants include R113, R141b and n-pentane.The experimental results indicate that the migration ratio of carbon nanotube increases with the increase of the outside diameter or the length of carbon nanotube.A model for predicting the migration ratio of carbon nanotubes in the refrigerant-based nanofluid pool boiling is proposed, and the predictions agree with 92% of the experimental data within a deviation of ±20%.

View Article: PubMed Central - HTML - PubMed

Affiliation: Institute of Refrigeration and Cryogenics, Shanghai Jiaotong University, 800 Dongchuan Road, Shanghai 200240, China. glding@sjtu.edu.cn.

ABSTRACT
The migration characteristics of carbon nanotubes from liquid phase to vapor phase in the refrigerant-based nanofluid pool boiling were investigated experimentally. Four types of carbon nanotubes with the outside diameters from 15 to 80 nm and the lengths from 1.5 to 10 μm were used in the experiments. The refrigerants include R113, R141b and n-pentane. The oil concentration is from 0 to 10 wt.%, the heat flux is from 10 to 100 kW·m-2, and the initial liquid-level height is from 1.3 to 3.4 cm. The experimental results indicate that the migration ratio of carbon nanotube increases with the increase of the outside diameter or the length of carbon nanotube. For the fixed type of carbon nanotube, the migration ratio decreases with the increase of the oil concentration or the heat flux, and increases with the increase of the initial liquid-level height. The migration ratio of carbon nanotube increases with the decrease of dynamic viscosity of refrigerant or the increase of liquid phase density of refrigerant. A model for predicting the migration ratio of carbon nanotubes in the refrigerant-based nanofluid pool boiling is proposed, and the predictions agree with 92% of the experimental data within a deviation of ±20%.

No MeSH data available.


Related in: MedlinePlus