Experimental study on critical heat flux enhancement and stability of nanofluid containing copper oxide and polypyrrole nanocomposite

IF 5.3 2区化学 Q2 CHEMISTRY, PHYSICAL

Journal of Molecular Liquids Pub Date : 2025-04-01 DOI:10.1016/j.molliq.2025.127494

Sara Gooran, Seyed Reza Shabanian, Mohsen Ghorbani

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引用次数: 0

Abstract

In this study, an experimental investigation on stability and critical heat flux (CHF) of three different nanofluids was carried out. Polypyrrole (PPy) and CuO nanoparticles and composites of CuO-PPy (in two methods) were synthesized and characterized by XRD, FTIR, FE-SEM and TEM techniques. Zeta potential analysis showed that the highest and lowest stability belongs to CuO-PPy-α/DW and CuO/DW nanofluids, respectively. For investigating how concentration affects the CHF, the nanofluids were synthesized at 0.01–0.09 wt% of nanoparticles in deionized water. The highest CHF, with an increase of 189 % compared to DW, is related to CuO-PPy-

α

nanofluid at 0.05 wt%. After passing this optimal concentration, the CHF decreased with concentration. SEM images of wire heater showed that thickness and roughness of the surface in the CuO-PPy-α case is more than other samples. The greater CHF value can be due to more nucleation sites and separate channels for water and air flow. Effect of mass ratio of nanoparticles in the synthesized nanocomposite on CHF has been investigated in three different ratios of CuO to PPy of 50:50, 25:75 and 75:25. The highest CHF belongs to CuO-PPy (50:50), which is 10 % and 13 % more than the nanocomposites of (25:75) and (75:25), respectively.

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来源期刊

Journal of Molecular Liquids 化学-物理：原子、分子和化学物理

CiteScore

10.30

自引率

16.70%

发文量

2597

审稿时长

78 days

期刊介绍： The journal includes papers in the following areas: – Simple organic liquids and mixtures – Ionic liquids – Surfactant solutions (including micelles and vesicles) and liquid interfaces – Colloidal solutions and nanoparticles – Thermotropic and lyotropic liquid crystals – Ferrofluids – Water, aqueous solutions and other hydrogen-bonded liquids – Lubricants, polymer solutions and melts – Molten metals and salts – Phase transitions and critical phenomena in liquids and confined fluids – Self assembly in complex liquids.– Biomolecules in solution The emphasis is on the molecular (or microscopic) understanding of particular liquids or liquid systems, especially concerning structure, dynamics and intermolecular forces. The experimental techniques used may include: – Conventional spectroscopy (mid-IR and far-IR, Raman, NMR, etc.) – Non-linear optics and time resolved spectroscopy (psec, fsec, asec, ISRS, etc.) – Light scattering (Rayleigh, Brillouin, PCS, etc.) – Dielectric relaxation – X-ray and neutron scattering and diffraction. Experimental studies, computer simulations (MD or MC) and analytical theory will be considered for publication; papers just reporting experimental results that do not contribute to the understanding of the fundamentals of molecular and ionic liquids will not be accepted. Only papers of a non-routine nature and advancing the field will be considered for publication.