The effect of functionalized group concentration on the stability and thermal conductivity of carbon nanotube fluid as heat transfer media

✍ Scribed by Zeinab Talaei; Ali Reza Mahjoub; Ali morad Rashidi; Azadeh Amrollahi; Majid Emami Meibodi

• Publisher: Elsevier Science
• Year: 2011
• Tongue: English
• Weight: 766 KB
• Volume: 38
• Category: Article
• ISSN: 0735-1933
• DOI: 10.1016/j.icheatmasstransfer.2010.12.035

✦ Synopsis

In this research, the pristine CNTs sample synthesized by the CCVD method contains catalytic particles and the carbonaceous impurities, and then the special purification procedure was done. By different methods CNT functionalized with various concentration of COOH was prepared. The carboxylated CNTs were analyzed by back titration method for determining the COOH concentrations on the surface of the oxidized CNTs. Thermal conductivity of difference carbon nanotube fluid has been measured under the stable condition by KD 2 prob. For the first time, we have compared the effect of difference COOH concentration as important parameter in stability and heat transfer behavior of nanofluid. The results show that increasing the functionalized group causes better stability and higher thermal conductivity if the surface of MWNT does not damage in functionalize process.