Thermal properties characteristics of MWCNT-OH based Nanofluids in mixture of Ethylene Glycol and Deionized water / Amirah Abdullah...[et al.]

Abdullah*,, Amirah and Mohamad,, Imran Syakir and Masripan,, Nor Azmmi and Zainal Abidin, Syazwani and Bani Hashim, Ahmad Yusairi (2018) Thermal properties characteristics of MWCNT-OH based Nanofluids in mixture of Ethylene Glycol and Deionized water / Amirah Abdullah...[et al.]. Journal of Mechanical Engineering (JMechE), 15 (2). pp. 53-71. ISSN 1823-5514 ; 2550-164X

Abstract

Conventional fluids have lower thermal properties. Moreover, the low freezing and high boiling point of water are another issues have made limitation occurred. Therefore, inclusion of MWCNT-OH nanoparticles in mixture of ethylene glycol and deionized water is an alternative way to solve these problems. Then, two-step method is used in nanofluids synthesizing through homogenized and sonicated all materials together such as MWCNT-OH nanoparticles (0.1 wt% to 1.0 wt%) and PVP surfactant (0.01 wt%) in mixture of ethylene glycol to deionized water (20:80) for five minutes. The nanofluids were tested in thermal conductivity test, heat transfer coefficient test and specific heat test. Thus, the thermal conductivity results show positive enhancement for all concentrations and 0.9 wt% of MWCNT-OH based nanofluids have the highest thermal conductivity. It is followed by 0.3 wt% and 0.6 wt% of MWCNT-OH based nanofluids. The percentage enhancement of thermal conductivity is about 0.812% to 17.0%. Whilst, high heat transfer coefficient has given increment of nanofluids Nusselt number. However, specific heat test have decrement values with increment of weight loading even though has high thermal conductivity values. This thermal properties results are affected by dispersion and suspensions of nanoparticles possess higher thermal conductivity. In addition, functionalized group attached on nanoparticles, quantity of surfactant, ultrasonication process and nanofluids stability are factors which influenced the thermal conductivity. Moreover, heat absorption and capacity of nanofluids and as well as temperature are another factors that capable to enhance the thermal conductivity. The small size and high surface area of nanoparticles, low surface roughness, nanoparticles concentration, temperature and nanoparticles interaction are others influenced factors in these test. Whilst, lower specific heat value on nanoparticles and agglomeration form affected in specific heat test. In conclusion, addition of MWCNT-OH nanoparticles in mixture of base fluids is capable to improve thermal properties of nanofluids.

Metadata

Item Type: Article
Creators:
CreatorsEmail / ID. Num
Abdullah*,, Amirahamirahabdullah2911@gmail.com
Mohamad,, Imran SyakirUNSPECIFIED
Masripan,, Nor AzmmiUNSPECIFIED
Zainal Abidin, SyazwaniUNSPECIFIED
Bani Hashim, Ahmad YusairiUNSPECIFIED
Subjects: T Technology > TJ Mechanical engineering and machinery
Divisions: Universiti Teknologi MARA, Shah Alam > Faculty of Mechanical Engineering
Journal or Publication Title: Journal of Mechanical Engineering (JMechE)
Journal: UiTM Journal > Journal of Mechanical Engineering (JMechE)
ISSN: 1823-5514 ; 2550-164X
Volume: 15
Number: 2
Page Range: pp. 53-71
Official URL: https://jmeche.uitm.edu.my/
Item ID: 36325
Uncontrolled Keywords: Thermal Conductivity, Heat Transfer Coefficient, Specific Heat Nanofluids.
URI: http://ir.uitm.edu.my/id/eprint/36325

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