Investigation on Convective Heat Transfer and Flow Features of Nanofluids
01 Feb 2003-Journal of Heat Transfer-transactions of The Asme (American Society of Mechanical Engineers)-Vol. 125, Iss: 1, pp 151-155
TL;DR: In this article, an innovative new class of heat transfer fluids can be engineered by suspending metallic nanoparticles in conventional heat-transfer fluids, which are expected to exhibit high thermal conductivities compared to those of currently used heat transfer fluid, and they represent the best hope for enhancing heat transfer.
Abstract: Low thermal conductivity is a primary limitation in the development of energy-efficient heat transfer fluids that are required in many industrial applications. In this paper we propose that an innovative new class of heat transfer fluids can be engineered by suspending metallic nanoparticles in conventional heat transfer fluids. The resulting {open_quotes}nanofluids{close_quotes} are expected to exhibit high thermal conductivities compared to those of currently used heat transfer fluids, and they represent the best hope for enhancement of heat transfer. The results of a theoretical study of the thermal conductivity of nanofluids with copper nanophase materials are presented, the potential benefits of the fluids are estimated, and it is shown that one of the benefits of nanofluids will be dramatic reductions in heat exchanger pumping power.
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TL;DR: In this paper, a parametric investigation of entropy generation of nanofluid turbulent forced convection inside a circular section tube subjected to constant wall heat flux is presented, where the impact of the dispersed nanoparticles on total, thermal and frictional entropy generation is investigated and optimal working conditions are highlighted.
119 citations
TL;DR: In this paper, the in-situ growth and chemical co-precipitation method was used for the synthesis of uniform dispersion of Co 3 O 4 nanoparticles on the graphene oxide (GO) nanosheet.
119 citations
TL;DR: In this paper, the authors provide a comprehensive summary on a certain aspect of a certain nanofluid and identify the challenges and opportunities for the future study, and provide an overview of the research progress in the heat transfer applications of TiO2 nano-fluids.
118 citations
01 Jan 2010
TL;DR: The Journal of Enhanced Heat Transfer (JET) as discussed by the authors is a journal dedicated to the study of enhanced heat and mass transfer in natural and forced convection of liquids and gases, boiling, condensation, radiative heat transfer.
Abstract: US rate for 2010 subscription is $654 call publisher for price information for print/online or online only subscriptions. Add $10.00 per issue for foreign airmail shipping and handling fees to all orders shipped outside the United States or Canada. All subscriptions are payable in advance. Subscriptions are entered on an annual basis, i.e., January-December. For immediate service and charge card sales, call (203) 938-1300 Monday through Friday 9 am–5 pm est. This journal contains information from authentic and highly regarded sources. Reprinted material is quoted with permission, and sources are indicated. A wide variety of references is listed. Reasonable efforts have been made to publish reliable data and information, but the editor and the publisher assume no responsibility for any statements of fact or opinion expressed in the published papers or in the advertisements. those organizations that have been granted a photocopy license by CCC, a separate payment system has been arranged.The fee code for users of the Transactional Reporting Service is: [ISSN 1065-5131/05 $35.00+$0.00]. The fee is subject to change without notice. Begell House, Inc.'s, consent does not extend to copying for general distribution, for promotion, for creating new works, or for resale. Specific permission must be obtained from Begell House, Inc., for such copying. The Journal of Enhanced Heat Transfer will consider a wide range of scholarly papers related to the subject of " enhanced heat and mass transfer " in natural and forced convection of liquids and gases, boiling, condensation, radiative heat transfer. Areas of interest include: • Specially configured surface geometries, electric or magnetic fields, and fluid additives-all aimed at enhancing heat transfer rates. Papers may include theoretical modeling, experimental techniques, experimental data, and/or application of enhanced heat transfer technology. • The general topic of "high performance" heat transfer concepts or systems is also encouraged. • The journal will also consider well-prepared review articles within the identified subject areas. • Archival quality papers previously published at limited distribution conferences are also accepted. The author may need to provide a copyright release from the conference publisher Authors should submit their manuscript electronically in Word or pdf format. Electronically transmitted manuscripts should be e-mailed to the Editor-in-Chief, Ralph.Webb@psu.edu. Authors may also electronically submit manuscripts to any of the regional editors listed on the inside Journal cover or on the Begell House website The manuscript must be accompanied by a statement that it has not been published elsewhere and …
118 citations
TL;DR: In this article, an innovative approach to escalate the heat generation in peristalsis flow of MHD nanofluids filled in an asymmetric channel is proposed, where three different shapes of nanoparticles, namely (1) spherical, (2) disc and (3) cylindrical are utilized.
Abstract: An innovative approach to escalate the heat generation in peristalsis flow of MHD nanofluids filled in an asymmetric channel is proposed. Three different shapes of nanoparticles, namely (1) spherical, (2) disc and (3) cylindrical are utilized. Results for temperature, velocity and concentrations have been obtained analytically. The physical features for heat generation, concentration, pressure gradient, pressure rise and magnetic parameter have been elaborated graphically, whereas effects of Nusselt number and skin friction have been numerically computed by using the MATLAB software. For bolus features, trapping phenomena are also inspected by dint of stream lines. It is found that cylindrical shapes of nanoparticles have very low thermal conductivity as compared to spherical and disc shapes. Moreover, it is seen that the heat generation parameter always increases the temperature of nanofluid, and consequently, the trapping phenomena produce more boluses for larger values of heat source parameter.
118 citations
References
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Book•
01 Jan 1985
TL;DR: In this article, the physical concepts and methodologies of heat and mass transfer are explained for advanced undergraduate engineering majors, using a systematic method for problem solving and discusses the relationship of heat transfer to many important practical applications through examples and problems.
Abstract: This book, designed for advanced undergraduate engineering majors, explains the physical concepts and methodologies of heat and mass transfer. It uses a systematic method for problem solving and discusses the relationship of heat and mass transfer to many important practical applications through examples and problems. A and significant contribution is the extensive use of the First Law of thermodynamics.
4,113 citations
TL;DR: In this article, the authors used a Brookfield rotating viscometer to measure the viscosities of the dispersed fluids with γ-alumina (Al2O3) and titanium dioxide (TiO2) particles at a 10% volume concentration.
Abstract: Turbulent friction and heat transfer behaviors of dispersed fluids (i.e., uttrafine metallic oxide particles suspended in water) in a circular pipe were investigated experimentally. Viscosity measurements were also conducted using a Brookfield rotating viscometer. Two different metallic oxide particles, γ-alumina (Al2O3) and titanium dioxide (TiO2), with mean diameters of 13 and 27 nm, respectively, were used as suspended particles. The Reynolds and Prandtl numbers varied in the ranges l04-I05 and 6.5-12.3, respectively. The viscosities of the dispersed fluids with γ-Al2O3 and TiO2 particles at a 10% volume concentration were approximately 200 and 3 times greater than that of water, respectively. These viscosity results were significantly larger than the predictions from the classical theory of suspension rheology. Darcy friction factors for the dispersed fluids of the volume concentration ranging from 1% to 3% coincided well with Kays' correlation for turbulent flow of a single-phase fluid. The Nusselt n...
3,730 citations
3,019 citations
"Investigation on Convective Heat Tr..." refers background in this paper
...Hamilton and Crasser (1962) have developed a more elaborate model for the effective thermal conductivity of twocomponent mixtures as a function of the conductivity of the pure materials, the composition of the mixture, and the shape of the dispersed particles....
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TL;DR: In this paper, a transient hot-wire method was used to measure the thermal conductivity of a small amount of nanoparticles and the experimental results showed that these nanoparticles have substantially higher thermal conductivities than the same liquids without nanoparticles.
Abstract: Oxide nanofluids were produced and their thermal conductivities were measured by a transient hot-wire method. The experimental results show that these nanofluids, containing a small amount of nanoparticles, have substantially higher thermal conductivities than the same liquids without nanoparticles. Comparisons between experiments and the Hamilton and Crosser model show that the model can predict the thermal conductivity of nanofluids containing large agglomerated Al{sub 2}O{sub 3} particles. However, the model appears to be inadequate for nanofluids containing CuO particles. This suggests that not only particle shape but size is considered to be dominant in enhancing the thermal conductivity of nanofluids.
2,811 citations
TL;DR: In this article, the authors proposed two different approaches for deriving heat transfer correlation of the nanofluid, and investigated the mechanism of heat transfer enhancement of the nano-fluid.
2,355 citations