Heat transfer characteristics of NiO nanofluid in heat exchanger

Puspitasari, Poppy; Permanasari, Avita Ayu; Shaharun, Maizatul Shima; Tsamroh, Dewi Izzatus

doi:10.1063/5.0000883

Cited by 10 publications

(3 citation statements)

References 17 publications

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“…The thermophysical properties of a nano lubricant are highly essential for improving the heat transfer process [12]. Meanwhile, the thermophysical property of a material is highly affected by its type and specific content.…”

Section: Analysis Of Thermophysical Propertymentioning

confidence: 99%

Identification of Thermophysical and Rheological Properties of SAE 5w-30 with Addition of Hexagonal Boron Nitride

Asmoro

Puspitasari²,

Permanasari

et al. 2023

jtmt

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This research uses SAE 5W-30 lubricant base material with the addition of Hexagonal Boron Nitride (hBN) nanoparticle additives. This study aims to analyze the thermophysical and rheological properties of lubricants with the addition of nanoparticles. The method in this study uses a two-step method where nanoparticles are first prepared separately, then added with nanoparticles with varying volume fractions of 0.05%, 0.10%, 0.15% into the base fluid as a processing step. The next step is the stirring process using a magnetic stirrer, and ultrasonic homogenizer process. Furthermore, the nanolubricant was tested for thermophysical properties including viscosity, density, thermal conductivity, and sedimentation.

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Section: Analysis Of Thermophysical Propertymentioning

confidence: 99%

Identification of Thermophysical and Rheological Properties of SAE 5w-30 with Addition of Hexagonal Boron Nitride

Asmoro

Puspitasari²,

Permanasari

et al. 2023

jtmt

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show abstract

“…Their thermal characteristics are better than those of the base fluids. These strongly depend on the properties of added nanoparticles and especially their size, shape, volume fraction and type of material [93][94][95][96][97][98]. Rafiq et al in [99] reported that some nanoparticles based on copper, silica and alumina improve thermal conductivity in a linear relationship with the mass fraction in the mixture.…”

Section: Synthetic Ester-based Nanofluidsmentioning

confidence: 99%

A Review on Synthetic Ester Liquids for Transformer Applications

et al. 2020

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Synthetic esters have become more and more popular in last few decades, explaining the increasing number of units filled with this liquid year by year. They have been investigated under different aspects, both from the fundamental point of view and breakdown mechanisms, well as from the application point of view. However, their use in high voltage equipment is always a challenge and deeper knowledge of the various aspects that can be encountered in their exploitation is needed. The intent of this review paper is to present the recent research progress on synthetic ester liquid in relation to the selected issues, most important for ester development in the authors’ opinion. The described issues are the breakdown performance of synthetic esters, lightning impulse strength and pre-breakdown phenomena of synthetic esters, synthetic esters-based nanofluids, combined paper-synthetic ester based insulating systems, application of synthetic ester for retro-filling and drying of mineral oil-immersed transformers, DGA(dissolved gas analysis)-based diagnosis of synthetic esters filled transformers as well as static electrification of synthetic esters. The different sections are based both on the data available in the literature, but above all on the authors’ own experience from their research work on synthetic ester liquids for electrical application purposes.

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“…The cooling property of fluids can be further improved by adding certain types of nanoparticles (NPs) to the fluid [4][5][6][7]. Many investigations have shown, over the past three decades that NPs significantly improve the heat transfer of insulating liquids [4][5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

DC Breakdown Voltage of Synthetic Ester Liquid-Based Nanofluids

2020

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Synthetic esters are potential substitutes for mineral oil in power transformers owing to their biodegradability and excellent dielectric withstand. Furthermore, the addition of certain nanoparticles improves the cooling property of liquids. Both dielectric withstand and cooling are two fundamental characteristics for use in breathable components. Previous studies showed that AC breakdown voltage of synthetic ester could be increased by adding Fe 3 O 4 , Al 2 O 3 and SiO 2 nanoparticles. This paper deals with the DC breakdown voltage of the same synthetic ester-based nanofluids. Nanofluid samples are characterized using the same techniques to those used for AC breakdown voltage study. This includes a particle size analyzer, scanning electron microscope and energy dispersive x-ray spectroscopy analyzer. Statistical analysis of experimental data using normal and Weibull laws and an estimate of DC breakdown voltage with probabilities of risk of 1% and 50% are performed. The experimental results evidence the existence of an optimum concentration of nanoparticles that gives the highest DC breakdown voltage, except SiO 2 nanoparticles which degrade the DC breakdown voltage of pure synthetic ester, regardless of the concentration. For the other two types of nanoparticles, the DC breakdown voltage is improved by approximately 25%, 13%, and 10%, with Al 2 O 3 (13 nm), Al 2 O 3 (50 nm), and Fe 3 O 4 (50 nm) nanoparticles at the optimum concentration that is 0.05 g/L, respectively. It is also shown that the obtained results generally comply with the normal and Weibull distribution laws. INDEX TERMS Nanofluids, breakdown voltage, normal distribution, Weibull distribution, power transformer, synthetic ester.

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Heat transfer characteristics of NiO nanofluid in heat exchanger

Cited by 10 publications

References 17 publications

Identification of Thermophysical and Rheological Properties of SAE 5w-30 with Addition of Hexagonal Boron Nitride

Identification of Thermophysical and Rheological Properties of SAE 5w-30 with Addition of Hexagonal Boron Nitride

A Review on Synthetic Ester Liquids for Transformer Applications

DC Breakdown Voltage of Synthetic Ester Liquid-Based Nanofluids

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