Review on thermal properties of nanofluids: Recent developments.

A synoptic review of MoS2: Synthesis to applications

The mineral oil or synthetic oil in conjunction with paper is mainly being applied as dielectric medium in many of the high voltage apparatus. However, the advent of high voltage levels such high voltage alternating current HVAC and high voltage direct current HVDC has prompted researchers to direct their focus onto an insulation system which can bear the rising high voltage levels. The modern insulating liquid material development is guided by various factors such as high electrical insulation requirements and other safety and economic considerations. Therefore transformer manufacturer companies have to design transformers with these new specific requirements. The transformer oil-based nanofluids with improved dielectric and thermal properties have the potential to replace mineral oil base products in the market place. They are favorable because they function more superior than mineral oil and they contribute definite insulating and thermal gains. This paper reviews recent status of nanofluids use as transformer oils. The nanofluids used as transformer oils are presented and their advantages are described in comparison with mineral oil. The multiple experimental works carried out by different researchers are described, providing an overview of the current research conducted on nanofluids. In addition scope and challenges being confronted in this area of research are clearly presented.

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A Review on Properties, Opportunities, and Challenges of Transformer Oil-Based Nanofluids

Heat transfer fluids are a crucial parameter that affects the size and costs of heat exchangers However, the available coolants like water and oils have low thermal conductivities, which put many limitations to the development of heat transfer to achieve high performance cooling The need for development of new classes of fluids which enhance the heat transfer capabilities attracted the attention of many researchers In the last few decades, modern nanotechnology developed nanoparticles, which have unique thermal and electrical properties that could help improve heat transfer using nanofluids A “nanofluid” is a fluid with suspended fine nanoparticles which increases the heat transfer properties compared with the original fluid Nanofluids are considered a new generation of heat transfer fluids and are considered two-phase fluids of liquid solid mixtures The efficiency of the fluid could be improved by enhancing its thermal properties, especially the thermal conductivity, and it is expected that the nanofluids will have a greater thermal conductivity than the base fluids This paper reviews the preparation of metallic and nonmetallic nanofluids along with the stability of the produced nanofluids Physical and thermal properties as well as a range of applications are also discussed in detail

/pdf/critical-review-on-nanofluids-25mm2yetjr.pdf

Critical Review on Nanofluids

Molten-salt-based nanofluids and ionic-liquid-based nanofluids are developed for thermal storage and heat transfer at relatively high temperatures, in the past few years. Preparation and stabilization techniques are briefly introduced firstly, and then, thermal properties, e.g., specific heat, thermal conductivity and viscosity, are summarized and discussed in detail. The properties are not only affected by the characteristics of nanomaterials and base fluids, but also affected by the synthesis method, such as the sonication intensity and duration. Some of the thermophysical property data are still incomplete, especially the thermal conductivity of molten-salt-based nanofluids, and properties of ionic-liquid-based nanofluids at high temperatures. While several literature works show that the Krieger–Dougherty model can well predict the viscosity, no general models for thermal conductivity and specific heat have been developed yet for both types of nanofluids.

/pdf/a-review-on-molten-salt-based-and-ionic-liquid-based-3ikw7t9fhm.pdf

A review on molten-salt-based and ionic-liquid-based nanofluids for medium-to-high temperature heat transfer

The lipophilic MoS2 nanoparticles are synthesized by surface modification with stearic acid (SA). The heat transfer oil-based nanofluids, with the mass fraction of lipophilic nanoparticles varying from 0.25% up to 1.0%, are prepared and their thermal conductivity is determined at temperatures ranging from 40 to 200°C using an apparatus based on the laser flash method. It has been found that the nanofluids have higher thermal conductivity and the thermal conductivity enhancement increased not only with increasing mass fraction of nanoparticles, but also with increasing temperature in the range 40-180°C The results show a 38.7% enhancement of the thermal conductivity of MoS2 nanofluid with only 1.0% mass fraction at 180°C.

/pdf/preparation-and-enhancement-of-thermal-conductivity-of-heat-2ed5salaxu.pdf

Preparation and enhancement of thermal conductivity of heat transfer oil-based MoS 2 nanofluids

Nanofluids Containing Stearic Acid-Modified CuO Nanorods and Their Thermal Conductivity Enhancements

Boronic-Acid-Accelerated Electrophilic Activation of Unprotected Maltols to N-Substituted Hydroxypyridinones in Water.

Water Mediated Rh(Iii)-Catalyzed C-H Activation/Intramolecular Annulation for the Synthesis of N-Methoxypiperazin-2-One Fused Heterocycles

The development of modular, chemically diverse and regioselective reactions for expanding the cycloaddition reaction toolbox hinges heavily on a strict functional 1,3-dipole and dipolarophile pairing exploration. In this study, we...

Ac-L-Methionine-Catalyzed, Nitrite-Triggered Cycloaddition Reaction Between Bromide and Alkyne/Alkene: A step-economical reaction for modular synthesis

Xiu-Wen Zhong

Papers

Preparation and enhancement of thermal conductivity of heat transfer oil-based MoS 2 nanofluids

Nanofluids Containing Stearic Acid-Modified CuO Nanorods and Their Thermal Conductivity Enhancements

Boronic-Acid-Accelerated Electrophilic Activation of Unprotected Maltols to N-Substituted Hydroxypyridinones in Water.

Water Mediated Rh(Iii)-Catalyzed C-H Activation/Intramolecular Annulation for the Synthesis of N-Methoxypiperazin-2-One Fused Heterocycles

Ac-L-Methionine-Catalyzed, Nitrite-Triggered Cycloaddition Reaction Between Bromide and Alkyne/Alkene: A step-economical reaction for modular synthesis