The volume fraction, shape, dimensions and properties of the nanoparticles affect the thermal conductivity of. Nanofluid is a new kind of heat transfer medium, containing nanoparticles 1100 nm which are uniformly and stably distributed in a base fluid. The opening chapters explain governing equations and then move on to discussions of free and forced convection heat transfers of nanofluids. Chart and diagram slides for powerpoint beautifully designed chart and diagram s for powerpoint with visually stunning graphics and animation effects. Introduction nanofluids are a relatively new class of fluids which consist of a base fluid with nanosized particles 1100 nm suspended within them. Recent development of nanotechnology brings out a new heat transfer coolant called nanofluids these fluids exhibit larger thermal properties. Reza azizian research scientist advanced thermal solutions, inc.
The seminar report first, we discuss the preparation of nanofluids. Since the past decade, rapid development in nanotechnology has produced several aspects for the scientists and technologists to look into. The seminar report proposed a theoretical model to describe heat transfer performance of the nanofluid flowing in a tube, with accounting for dispersion of solid particles. Toprak, experimental study of nanofluid effect on thermal performance of screen mesh heat pipe, proceedings of the uk heat transfer conference ukhtc20, 20, 981 988 5. Heat transfer enhancement of nanofluids sciencedirect. Morteza ghanbarpour, nader nikkam, rahmatollah khodabandeh, muhammet s. Power requirements for electronic devices have risen steadily in recent years, with the rate of increase sloping upwards, and that has necessitated enhanced thermal management solutions to preserve performance and maintain the mean time between failures mtbf of these devices. Density and specific heat are proportional to the volume ratio of solid and liquid in the system, generally with density increasing and specific heat decreasing with addition of nanoparticles to the fluid. The aim of this study is to evaluate heat transfer coefficient and friction factor for flow in a tube and with twisted tape inserts in the transition range of flow with al 2 o 3 nanofluid. What are nanofluids and which are their applications. Choi and eastman have tried to suspend various metal and metal oxides nanoparticles in several different fluids choi 1998. Theyll give your presentations a professional, memorable appearance the kind of sophisticated look that todays audiences expect. Nanofluids, the fluid suspensions of nanomaterials, have shown many interesting properties, and the distinctive features offer unprecedented potential for many applications. An atmosphericpressure coolant system has lower potential capital cost.
A nanofluid is a fluid containing nanometer sized particles, called nanoparticles. Nanofluid heat transfer compared to liquid predictive models nanofluid heat transfer higher than predicted for water base fluid nanofluid heat transfer well predicted for ethylene glycolwater base fluid prediction is required for application and fundamental understanding but commercial viability is related to enhancement independent of. Using a nanofluid pvt collector, a business could potentially operate solely on renewable energy, impervious to swings in gas and electricity prices. Pdf on sep 27, 2019, mahmoud salem ahmed and others published nanofluid. The presentation of the experimental setup in schematic diagram 92. The nanofluid can be readily configured either in a low state, where it conducts heat poorly, or in a high state, where the dissipation is more efficient. The heat transfer coefficient of the nanofluid increased with an increase in the mass flow rate of the hot water and nanofluid, and increased with a decrease in the nanofluid temperature, and the temperature of the heating fluid had no significant effect on the heat transfer coefficient of the nanofluid. Thermal conductivity of nanofluids semantic scholar. Application of nanofluids in heat transfer 415 where eff is the effective viscosity of nanofluid, bf is the base fluid viscosity, and is the volume fraction of the suspended particles. Nanofluid can be produced by onestep and twostep techniques.
It is an ideal and unique reference source for scientists and engineers working in this important and emerging research field of science, engineering and technology. Looking at these challenges, an optimization process is mandatory to obtain. The nanofluid shows great potential in enhancing the heat transfer process. One reason is that the suspended ultrafine particles remarkably increase the thermal conductivity of the nanofluid. Technical seminar presentation technical seminar on nanofluids darshan 2. Temperature dependence of thermalconductivity enhancement for al2o3in water nanofluids j.
Engineering nanofluids for heat transfer applications. In any nanofluid, the zeta potential can be ranged from positive, at low ph values, to negative, at high ph values. Nanofluid technology is a relatively new field, and as such, the supporting studies are not extensive. This paper summarizes the recent progress on the study of nanofluids, such as the preparation methods, the evaluation methods for the stability of nanofluids, and the ways to enhance the stability for nanofluids, the. Pdf on the onset of doublediffusive convection in a couple. Over the past decade, nanofluids, which are liquids containing suspensions of nanoparticles fig. Journal of nanofluids american scinetific publishers. Pdf nanofluids one simple product of the emerging world nanotechnology. Many mining and manufacturing processes leave waste products which consist of mixtures of nanoscale particles with fluids. This nanofluid also has a high boiling point, which is.
The specific heat of nanofluid is calculated from xuan and roetzel correlation 7. Common base fluids include water, ethylene glycol and oil. In terms of nanofluid stability, zeta potential value 60 mv has excellent stability, 40 to 60 mv has good stability, 30 to 40 mv is considered stable, and. The volume fraction, shape, dimensions and properties of the nanoparticles affect the thermal conductivity of nanofluids.
Worlds best powerpoint templates crystalgraphics offers more powerpoint templates than anyone else in the world, with over 4 million to choose from. The heat transfer coefficient of nanofluid flowing in a tube with 0. These distributed nanoparticles, generally a metal or metal oxide greatly enhance the thermal conductivity of the nanofluid. Nanofluids are colloidal mixtures of nanometric metallic or ceramic particles in a base fluid, such as water, ethylene glycol or oil. Since then, a large number of experimental and theoretical studies have been carried out by numerous researchers611. And only a tiny nanoparticle concentrationless than 0. Thermal conductivity of a liquid is an important physical property that decides its heat transfer performance. Nanofluids for thermal control applications principal investigator. Nanofluids department of mechanical engineering, msrit page of 22 high cost of nanofluids higher production cost of nanofluids is among the reasons that may hinder the application of nanofluids in industry. Compared to a conventional liquid and conventional twophase mixture, the nanofluid has higher thermal conductivity, does not block flow channels, and induces a very small pressure drop. The uploader spent hisher valuable time to create this nanotechnology nanofluids powerpoint presentation slides, to share hisher useful content with the world. Engineering nanofluids for heat transfer applications diva. Winner of the standing ovation award for best powerpoint templates from presentations magazine.
Review article heat exchanger using nano fluid prof. Comparison of measured and calculated nusselt numbers for a nanofluid flow. The vital role of nanofluids is to attain the highest possible thermal properties with low particle weight fractions by uniform dispersion and stable. Our new crystalgraphics chart and diagram slides for powerpoint is a collection of over impressively designed datadriven chart and editable diagram s guaranteed to impress any audience. Analysis of heat transfer enhancement of heat exchanger using. Nanofluid is one of the incredible outcomes of such advancement. It is introduced by choi on argonne national laboratory at. Alpesh mehta 1, 2dinesh k tantia, 3nilesh m jha, 4nimit m patel address for correspondence 1 assistant professor, government engineering college, godhra 2,3,4 students of 7th semester mechanical government engineering college.
Many natural processes in biosphere and atmosphere include wide spectrum of mixtures of nanoscale particles with different fluids. Two nanofluid samples with all of the parameters being the same but different type and amount of surfactants andor ph adjusters used, may result in quite different thermophysical properties and thermofluodynamic properties. Abstract the use of aqueous stabilized nanoparticle dispersions npds with 420 nm silicon dioxide particles has been demonstrated in both experimental laboratory evaluations and field trials to provide production improvements in wellbore remediati. The density of nanofluid is calculated using pak and cho correlations 7. The viscosity of nanofluid depends on many parameters. Applications of nanofluid for heat transfer enhancement. Development of nanofluids for cooling power electronics for. The couplestress fluid model is considered to describe the rheological behavior of the nanofluid and for porous medium darcy model is employed. Nanofluids nfs are nanotechnologybased colloidal dispersion prepared by dispersing nanoparticles nps in conventional liquids, as the base liquid.
The vital role of nanofluids is to attain the highest possible thermal properties with low particle weight fractions by. Download mechanical engineering seminar report and ppt presentation on nanofluids. Nanofluids colloidal suspensions of metallic and nonmetallic nanoparticles in conventional base fluids are best known for their remarkable change to enhanced heat transfer. Using nanofluid engineering approach to formulate and optimize suspensions to meet the property requirements defined by thermal analysis. However both methods require advanced and sophisticated equipments. Apr 09, 2014 nanofluids department of mechanical engineering, msrit page of 22 high cost of nanofluids higher production cost of nanofluids is among the reasons that may hinder the application of nanofluids in industry. This seminar report presents a procedure for preparing a nanofluid which is a suspension consisting of nanophase powders and a base liquid. Introduction of nanoparticles to the fluid affects all of thermophysical properties and should be accounted for in the nanofluid evaluations 18,19. To leap the chasm to heating and cooling technologies, the researchers will have to show more evidence of a stable operating system that responds to a larger range of heat flux. Many authors have been proposed correlations to calculate the heat transfer and pressure drop of fluids inside tubes, for example saiz jabardo et al. The situation changed when choi and eastman in argonne national laboratory revisited this field with their nanoscale metallic particle and carbon nanotube suspensions choi and eastman 1995.
The nanoparticles used in nanofluids are typically made of metals, oxides, carbides, or carbon nanotubes. Much of the first decade of nanofluid research was focused on measuring and. Applications of nanofluid for heat transfer enhancement explores recent progress in computational fluid dynamic and nonlinear science and its applications to nanofluid flow and heat transfer. Fy12fy fyfy14 determine the magnitude of enhancement in thermal properties of a nanofluid required. These fluids are engineered colloidal suspensions of nanoparticles in a base fluid. Applications of nanofluid for heat transfer enhancement 1st. Analysis of heat transfer enhancement of heat exchanger. Direct solar thermal absorption collectors incorporating a nanofluid.
Nanofluids kostic free download as powerpoint presentation. An introduction to the nanofluid by amin behzadmehr hassan azarkish. Viscosity viscosity is a measure of the tendency of a liquid to resist flow. Muhammed and bjorn palm, thermal performance of screen mesh heat pipe. Doublediffusive convection in a couple stress nanofluid 2018 62 3 abstract doublediffusive convection in a horizontal layer of nanofluid in a porous medium is studied. Nanofluids in electronics cooling applications advanced. Nanofluids can be produced by either one step or two steps methods. Later, brinkman 1952 presented a viscosity correlation eq. This nanofluid technology, is given primary importance where thermal engineering and nanotechnology meet together, has developed largely over the past decade.
87 1454 1487 42 455 588 649 364 1333 711 1355 1201 720 1066 627 688 389 161 786 1290 960 1167 1434 1061 1416 1349 860 1071 1049 402 1120 169