An experimental study on thermal characteristics of nanofluid with graphene and multi-wall carbon nanotubes

Abstract

High-thermal conductivity enhancement of nanofluid is one of the promising topics of the nanoscience research field. This work reports the experimental study on the preparation of graphene (GN) and multi-walled carbon nanotubes (MWCNTs) based nanofluids with the assistance of sodium dodecyl benzene sulfonate (SDBS) and sodium dodecyl sulfate (SDS) surfactants, and their thermal behaviors. The present work suggests not a solution, but a solution approach and deduces a new conclusion by trying to resolve the agglomeration problem and improve the dispersibility of nanoparticles in the base fluid. The analysis results of FESEM, thermal conductivity, diffusivity, effusivity and heat transfer coefficient enhancement ratio of nanofluid with surfactants SDS and SDBS expose strong evidence of the dispersing effect of surfactant on the making of nanofluid.

Effects of Surfactants on the Corrosion Behavior of Aluminum Alloy in Graphene Nanofluid

“…This indicates that the addition of surfactants increases the absolute zeta potential value of Water-GNP nanofluid, which corresponds with a lower tendency to flocculate. Further, SDBS-based nanofluid has the highest stability, followed by SDS-based nanofluid, which agrees with the study by [26,27]. In order to validate the zeta potential result, UV-Vis analysis was performed on the surfactantdispersed nanofluids due to the presence of little sediments.…”

Review on the recent progress in the preparation and stability of graphene-based nanofluids

“…Yarmand et al [147,161] increased the stability of nanofluids by introducing the hydroxyl and carboxyl function groups toward the GNP surface. With the same purpose, Mehrali et al [80] prepared NDG by a hydrothermal process with GO as a raw material [205] SPC + UV-Vis N/A Polymers P19 and P20 [206] ZPT N/A Changing pH [104] SPC + TC~ 7 days N/A [105] TC~ 150 days (5 months) N/A [117] SPC + UV-Vis~ 7 days N/A [118] SPC, UV-Vis, ZPT~ 60 days N/A [115] SPC N/A N/A [114] SPC, UV-Vis, ZPT~ 180 days (6 months) Triton X-100 [113] SPC N/A N/A [112] SPC 24 h N/A [3] SPC, UV-Vis, ZPT 600 h N/A [107] UV-Vis 1 week PVA [123] SPC 7 days N/A [122] ZPT + SPC N/A Modifying pH and tannic acid [121] SPC 2 months Modifying pH [124] SPC 4 days SDBS [129] SPC + UV-Vis 256 h N/A [131] ZPT, PSD, SPC~ 1 month Sodium carboxymethyl celluloses [132] DLS + TC > 2 months (0.005%), few days (> 0.005%)…”

A Short Review of Organic Nanofluids: Preparation, Surfactants, and Applications

“…It also additionally depends on the polarity of the base fluid, such as, in the research work of Al-Waeli et al (2019), CTAB was found to provide the maximum stability to the nanofluid, which was used by the authors to study the efficiency of the photovoltaic-thermal systems. SDS, on the other hand, has also been used extensively for stabilizing graphene/water-based nanofluid for welding, turning, and grinding processes (Haque et al, 2015;Seong et al, 2018;Zhai et al, 2019) and has been found to be quite effective. Selvam et al (2017) studied the stability mechanism and performance of sodium deoxycholate on graphene-based nanofluids and concluded that not only the mixture was stable, but the magnitude of the coefficient of thermal convection surpassed 100%.…”