Limits...
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

Schematic diagram of experimental apparatus.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC3211276&req=5

Figure 2: Schematic diagram of experimental apparatus.

Mentions: The experimental apparatus used for testing the migration characteristics of CNTs in the refrigerant-based nanofluid pool boiling mainly consists of a pool boiling device, a capture cover and a digital electronic balance, as schematically shown in Figure 2. The pool boiling device mainly consists of a boiling vessel and an electric heating membrane. The boiling vessel is a cylindrical glass container with the inside diameter of 50 mm and the height of 95 mm. The vessel is insulated with glass fibers to reduce heat loss to the surroundings. The electric heating membrane is connected with the direct-current voltage power supply. The ampere meter with the calibrated precision of 0.5% is used for reading electric current supplied to the heating surface, and a data acquisition system with the calibrated precision of 0.002% is used to measure the voltage across the heating surface. The heat flux through the heating surface is controlled by adjusting the heating power of the plate heater, and is calculated by the measured electric current, voltage, and heating surface area. The uncertainty of heat flux is estimated to be smaller than 1.2%. The capture cover is used to collect the CNTs spouted to the environment. The measurement range of the digital electronic balance is from 10.0 mg to 210.0000 g, and the maximum error is 0.1 mg. All the experiments are performed at atmospheric pressure (101.3 kPa) by venting the boiling vessel to ambient.


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)

Schematic diagram of experimental apparatus.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 2: Schematic diagram of experimental apparatus.
Mentions: The experimental apparatus used for testing the migration characteristics of CNTs in the refrigerant-based nanofluid pool boiling mainly consists of a pool boiling device, a capture cover and a digital electronic balance, as schematically shown in Figure 2. The pool boiling device mainly consists of a boiling vessel and an electric heating membrane. The boiling vessel is a cylindrical glass container with the inside diameter of 50 mm and the height of 95 mm. The vessel is insulated with glass fibers to reduce heat loss to the surroundings. The electric heating membrane is connected with the direct-current voltage power supply. The ampere meter with the calibrated precision of 0.5% is used for reading electric current supplied to the heating surface, and a data acquisition system with the calibrated precision of 0.002% is used to measure the voltage across the heating surface. The heat flux through the heating surface is controlled by adjusting the heating power of the plate heater, and is calculated by the measured electric current, voltage, and heating surface area. The uncertainty of heat flux is estimated to be smaller than 1.2%. The capture cover is used to collect the CNTs spouted to the environment. The measurement range of the digital electronic balance is from 10.0 mg to 210.0000 g, and the maximum error is 0.1 mg. All the experiments are performed at atmospheric pressure (101.3 kPa) by venting the boiling vessel to ambient.

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