Application of Nano-Fluids as Coolant in Heat Exchangers: A Review (original) (raw)
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Ultrahigh performance cooling is one of the important needs of many industries. However, low thermal conductivity is a primary limitation in developing energy-efficient heat transfer fluids that are required for cooling purposes. Nanofluids are engineered by suspending nano particles with average sizes below 100 nm in heat transfer fluids such as water, oil, diesel, ethylene glycol, etc. Innovative heat transfer fluids are produced by suspending metallic or non-metallic nanometer-sized solid particles. Experiments have shown that nanofluids have substantial higher thermal conductivities compared to the base fluids. These suspended nanoparticles can change the transport and thermal properties of the base fluid. The aim of this project is to summarize recent developments in research on nanofluids, and to carry out cfd analysis for four different nano fluids and the result is analysed, two fluids are selected for experimentation work and finally the experimented result is compared with...
HEAT TRANSFER ENHANCEMENT USING VARIOUS NANO FLUIDS –A REVIEW
Heat exchanger plays a very important role in modern industry. To improve the heat transfer rate the new innovative fluid is introduced called Nanofluid to improve the overall heat transfer. Nano fluid is Nano meter sized particle such as metal, oxide, and carbide etc., dispersed into base heat transfer fluid. This review paper is on the preparation of the nanofluids. Comparison of the past research on Nanofluids. Applications of the Nanofluids. Thermal conductivity is affected by the following parameters like shape, size, clustering, collision, porous layer, melting point of nanoparticle etc., controlling this type of parameters to increase the thermal conductivity of Nano fluid. © 2018, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal |
Development of Nano fluids for Improvement in Thermal Conductivity in Heat Exchangers: A Review
— Today's technology requires high performance device to save energy. Majority applications use water as a base fluid which has limitations to transfer heat from one medium to another. Introducing suspending nanoparticles (Nano fluids) in the heat transfer fluids such as water, oil, diesel, ethylene glycol etc. is emerging technology. Recent research work shows that Nano fluids have higher thermal conductivities compared to the base fluids. Aim of this review is to summarize the recent developments in research on the stability of Nanofluids, improvement of thermal conductivity and viscosity of nano fluid suspension.
Heat Transfer Improvement by Nano Fluids
2016
Mr. Sumit G. Wani.1 Dr.L.V.Kamble2 M.E.(Heat Power), Dr.DY Patil SOEA,Ambi, Talegaon,Pune,Maharshtra 1 H.O.D. Department of Mechanical Engineering, Dr.DY Patil SOEA,Ambi, Talegaon,Pune,Maharshtra2 ---------------------------------------------------------------------***----------------------------------------------------------------- Abstract: There has been increasing interest in nanofluid and its use in heat transfer enhancement. Nanofluids are suspensions of nanoparticles in fluids that show significant enhancement of their properties at modest nanoparticle concentrations. Nanofluids are quasi single phase medium containing stable colloidal dispersion of ultrafine or nanometric metallic or ceramic particles in a given fluid. This article covers recent advances in the last decade by researchers in heat transfer enhancement with nanofluids as the working fluid. A brief overview has been presented to understand the evolution of this concept, possible mechanism of heat conduction by n...
HEAT TRANSFER ENHANCEMENT USING NANO FLUIDS AND INNOVATIVE METHODS - AN OVERVIEW
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Nanofluids are quasi single phase medium containing stable colloidal dispersion of ultrafine or nanometric metallic or ceramic particles in a given fluid. Nanofluids possess immense potential of application to improve heat transfer and energy efficiency in several areas including vehicular cooling in transportation, power generation, defense, nuclear, space, microelectronics and biomedical devices. In the present contribution, a brief overview has been presented to provide an update on the historical evolution of this concept, possible synthesis routes, level of improvements reported, theoretical understanding of the possible mechanism of heat conduction by nanofluid and scopes of application. According to this review, the future developments of these technologies are discussed. In order to put the nanofluid heat transfer technologies into practice, fundamental studies are greatly needed to understand the physical mechanisms
Review on Nanofluids as Potential Heat Transfer Fluid
An automotive engine cooling system takes out of excess heat produced during engine operation. A vehicle cooling system regulates engine surface temperature for engine most optimal efficiency. Recent advancements and improvements in an engine for power forced engine cooling machine to develop new techniques to improve its overall performance efficiency and also to reduce fuel consumption. Nanofluid is a suspension of nanoparticles that is a promising heat transfer fluid inside the heat transfer enhancement having an excess of applications because of its advanced thermal conductivity and rheological properties. This paper points out the previous studies and recent progress in the field of improvement in heat transfer with the usage of nanofluid. The latest progress on preparation and enhancement of stability had been reviewed. Thermophysical properties, heat transfer characteristics of nanofluid, and various factors together with particle size, form, surfactant, temperature, and many others on thermal conductivity were presented. The present study discloses potential applications by nanofluid which include heat exchanger, transportation cooling, refrigeration, electronic system cooling, transformer oil, commercial cooling, nuclear device, machining operation, solar electricity and desalination, defense, and many others. Few barriers and challenges had been also addressed. The comprehensive review also covers the most recent investigations on the application of nanofluids in heat transfer enhancement of automotive radiators.
Review: Enhancement of heat transfer by using Nano fluids
This paper gives a detailed literature study and scrutiny into the results of the research and development, applications of nanofluids in heat transfer. Nanofluid is a comparatively new technology, the studies on nanofluid are not longer. Experimental data were reviewed in this study related to the enhancement of the thermal conductivity and convective heat transfer of nanofluids relative to conventional heat transfer fluids, and assessments were made as parameters of volume concentration, material, particle size, , base fluid material, temperature, particle shape, additive, and pH were taken into account, experimental results from so many researcher were used together when assessing data. The current state of knowledge is presented as well as areas where the data are presently inconclusive or conflicting. Heat transfer enhancement can be achieved using nanofluids is to be in the 15–40% range, with a few situations resulting in orders of magnitude enhancement
HEAT TRANSFER ENHANCEMENT OF NANO FLUIDS –A REVIEW
Thermal conductivity is considered important factor for rapid cooling and heating application. Base heat transfer fluid normally having low thermal conductivity, so we goes to Nano fluid for increases the heat transfer rate. Nano fluid is nanometre sized particle such as metal, oxide, and carbide etc., dispersed into base heat transfer fluid. In this paper shows varying factor affecting the thermal conductivity of Nano fluid at different conditions. All researcher tried to increase the heat transfer rate by considering thermal conductivity Nano fluid. Thermal conductivity is increased with increasing concentration of metal particle within critical limit. Thermal conductivity is affected by the following parameters like shape, size, clustering, collision, porous layer, melting point of nanoparticle etc., controlling this type of parameters to increase the thermal conductivity of Nano fluid. Nano fluid is advanced heat transfer fluid for next generation.
2018
The present research aims to suggest a three-step guideline towards selecting a proper Nanofluid regarding the heat transfer effectiveness. To do so, employing two-step technique, the nanofluid's samples were prepared in various nanoparticles' concentrations (0.125, 0.25, 0.5, 0.75, and 1%) of MWCNT-ZnO hybrid nanoparticle in a thermal oil. The samples' stability has been examined employing the Zeta potential analysis. The samples' thermal conductivity has been experimentally measured at various temperatures (15, 25, 35, 45, and 55 °C) and solid concentrations. After that, a three-step guideline to select a proper nanofluid as a heat transfer fluid has been proposed. Then, for both the internal laminar and turbulent regimes, variations of pumping power due to adding hybrid nanoparticle has been theoretically studied. Furthermore, the possible effects of adding nano-particles on the convective heat transfer coefficient in a microchannel heat sink have been investigated. The results declared that the convective heat transfer coefficient had been enhanced by 42%. It is concluded that the produced nanofluid, as coolant fluid, would bring a certain benefit in heat transfer applications. These pre-assessment process would ease the decision-making process in selecting a new coolant which possesses superior heat transfer properties in comparison to the conventional coolants (i.e., water and oil).