Experimental investigation on synthesis, characterization, stability, thermo-physical properties and rheological behavior of MWCNTs-kapok seed oil based nanofluid

Abstract

Several researchers devoted their efforts for the thermal conductivity enhancement of Carbon Nanotubes (CNTs) based nanofluids as CNTs have excellent thermal properties. However, limited research is reported on the detailed thermo-physical properties of CNTs and oil based nanofluids. In this work, the one-step method synthesis of a new MWCNTs-Kapok seed oil based nanofluid at constant nanoparticle concentration (0.1 wt./wt.) is reported. The nanofluid is characterized by FESEM, FTIR, visual stability analysis and thermophysical properties are experimentally measured. The viscosity found in the range of (0.049-10.101 Pa•s), the thermal conductivity of (0.165-0.207W/m•K) and enhancement of thermal conductivity (6.1538%) were observed. Moreover, the viscosity decreases, and thermal conductivity increases with an increase in temperature. The experimentally obtained data are found in agreement with existing models and modified correlations. The rheological behavior showed that nanofluid is non-Newtonian in nature and exhibiting shear thinning or pseudo plastic behavior.

An updated review of nanofluids in various heat transfer devices

“…The study observed that the viscosity increased by 7.04% when volume concentration was 0.7%. Hameed et al [142] synthesised an eco-friendly MWCNTs-Kapok seed oil nanofluid using a one-step method, at a constant nanoparticle concentration of 0.1%. Considering all of the experimental viscosity measurements conducted, the relationship between viscosity and both temperature and particle concentration is apparent.…”

Thermal Conductivity of Multiwalled Carbon Nanotubes‐Kapok Seed Oil‐Based Nanofluid

“…For the preparation of the nanofluid, a one‐step method , was adopted. The process involves the dispersion of nanoparticles, i.e., MWCNTs, into the base fluid, i.e., kapok oil, in a specific weight fraction of 0.2–0.6 in the temperature range of 25–65 °C.…”

“…In this case, an ultrasonic disruptor was used to evenly distribute MWCNTs in the base fluid (kapok seed oil). The ultrasonic disruptor was subjected to testing for 6 h, resulting in longer-lasting stability (minimum of one month, as in our previous work) of extremely stable nanofluid [2]. Compared with chemical mixing for extremely stable nanofluids, the effects of mechanical dispersion (ultrasonic disruptor) are greatly preferred.…”

“…In the application of nanofluids in heating and cooling, among different properties, the thermal conductivity plays an important role. Hence, several researchers have devoted their efforts to the measurement and prediction of the thermal conductivity . In recent decades, the prediction of the thermal conductivity of nanofluids with the help of computing methods such as artificial neural network (ANN) modeling is attracting significant attention of researchers working in this area, i.e., the prediction of the thermophysical properties of nanofluids.…”

Hybrid Materials Based on Carbon Nanotubes and Nanofibers for Environmental Applications

“…By manipulating this aspect, we can control the physicochemical properties of the hybrid material. Combination of carbon nanomaterials (CNMs) with polymers and inorganic nanoparticles improves mechanical (Gomathi et al, 2005;Zhao et al, 2011;Dillon et al, 2015;Wu et al, 2017), electrical (Whitsitt and Barron, 2003;Hang et al, 2005;Ivnitski et al, 2008;Liang et al, 2012), thermal (Cui et al, 2011;Chen L. et al, 2014;Aghabozorg et al, 2016;Hameed et al, 2019), sorptive (Deng et al, 2005;Choi et al, 2010;Saud et al, 2015;Navrotskaya et al, 2019) and catalytic (Wu et al, 2009;Paula et al, 2011;Aazam, 2014;Kim et al, 2014) properties (Kumar et al, 2008;Wu et al, 2009;Cui et al, 2011;Dillon et al, 2015). Thus, currently there emerges an opportunity to modify CNMs with various nanomaterials using elements of the periodic table, namely metal and metal oxide nanoparticles and inorganic salts.…”