The surfactants effect on the heat transfer enhancement and stability of nanofluid at constant wall temperature

Abstract

Surfactants role in the enhancement of the heat transfer and stability of alumina oxide – distilled water nanofluid was introduced in this research, where there are limited studies that conjugate between the stability improvement and its effect on the heat transfer coefficients. Four weight concentrations for the experiment were used (0.1, 0.3, 0.6, and 0.9%) with 20 nm particle size under a constant wall temperature. The selection of appropriate surfactants weight was tested too by implementing three weight concentrations (0.5, 1, 1.5, and 2 %) related to each nanofluid concentration via measuring their effect on the zeta potential value. The heat transfer augmentation was tested through a double horizontal pipe under a constant wall temperature at entrance region with Reynolds number range (4000–11800). The results manifested the use of nanofluid worked on enhancement the heat transfer performance better than water, and the stable nanofluid elucidated better results.

A Review on Stability and Heat Transfer Performance of Nanofluid Using Surfactants

“…The results showed that a maximum of thermal conductivity enhancements of up to 35% with the optimum amount of surfactant. Furthermore, Askar et al [16] also had similar results where nanofluid with surfactant has higher heat transfer enhancement compare without surfactant. Ouikhalfan et al [19] found that TiO2/water with SDS and CTAB surfactants had 10% thermal conductivity enhancement compared with the sample without surfactant.…”

“…The nanofluid prepared manage to stable for 5 weeks. Askar et al [16] had prepared a stable prepared Al2O3/water nanofluid using SDS for 44 days for 1wt% nanoparticle with 0.5wt% surfactant. Das et al [17] had prepared a stable Al2O3/water using SDBS for several hours.…”

“…This causes the stability of nanofluids to increase. Askar et al [16] had prepared Al2O3/water nanofluid using SDS for four volume fractions of SDS (0.1, 0.3, 0.6, and 0.9%). The zeta potential readings for each nanofluid prepared were very high which was >40mV.…”

Single and Hybrid Nanofluids to Enhance Performance of Flat Plate Solar Collectors: Application and Obstacles

“…Therefore, sonication is often used after magnetic stirring [96]. Surfactants are a simple method, and effective chemical method applies to reduce the surface tension of the base fluid and improve the immersion of NPs for long term stability [97]. Surfactants are generally divided into four categories based on head composition; namely ionic (long-chain fatty acids, alkyl sulphates, sulfosuccinates, phosphates, and sulfonates), nonionic (polyethylene oxide, alcohols), cationic (longchain quaternary ammonium compounds and long-chain amines), and amphoteric surfactants [98].…”

Effects of surfactant and nanofluid on the performance and optimization of a microchannel heat sink

“…Many surfactants have already been tested with various nanoparticles such as Sodium Dodecylbenzene (SDBS) (Wusiman et al, 2013;Estellé et al, 2015;Kim et al, 2018), Sodium Dodecyl Sulphate (SDS) (Kim et al, 2018), Cetyl Trimenthyl Ammonium Bromide (CTAB) (Leong et al, 2016;Choi et al, 2018), Polyvinylpyrrolidone (PVP) , and Gum Arabic (Leong et al, 2016). As reported by Askar et al (2020) and Ma et al (2021), different surfactants can both positively or negatively affect the thermophysical properties of a nanofluid and their efficiency as coolants.…”