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Title: Remarks on Constitutive Modeling of Nanofluids

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Journal Article: Published Article
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Advances in Mechanical Engineering
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Journal Volume: 4; Related Information: CHORUS Timestamp: 2017-07-19 18:58:04; Journal ID: ISSN 1687-8140
SAGE Publications
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Country unknown/Code not available

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Massoudi, Mehrdad, and Phuoc, Tran X. Remarks on Constitutive Modeling of Nanofluids. Country unknown/Code not available: N. p., 2015. Web. doi:10.1155/2012/927580.
Massoudi, Mehrdad, & Phuoc, Tran X. Remarks on Constitutive Modeling of Nanofluids. Country unknown/Code not available. doi:10.1155/2012/927580.
Massoudi, Mehrdad, and Phuoc, Tran X. 2015. "Remarks on Constitutive Modeling of Nanofluids". Country unknown/Code not available. doi:10.1155/2012/927580.
title = {Remarks on Constitutive Modeling of Nanofluids},
author = {Massoudi, Mehrdad and Phuoc, Tran X.},
abstractNote = {},
doi = {10.1155/2012/927580},
journal = {Advances in Mechanical Engineering},
number = ,
volume = 4,
place = {Country unknown/Code not available},
year = 2015,
month = 1

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Publisher's Version of Record at 10.1155/2012/927580

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Cited by: 6works
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  • Nanofluids are made by adding nanoscale particles in low volumetric fractions to a fluid in order to enhance or improve their rheological, mechanical, optical, and thermal properties. The base fluid can be any liquid such as oil, water, ethylene glycol, or conventional fluid mixtures. Limited available studies on nanofluid viscosity have been reported [1-19]. In most of these studies, the behavior of the viscosity and the shear stress of nanofluids have been interpreted using the widely used empirical model developed by Casson [20].
  • No abstract prepared.
  • Agglomeration strongly influences the stability or shelf life of nanofluid. The present computational and experimental study investigates the rate of agglomeration quantitatively. Agglomeration in nanofluids is attributed to the net effect of various inter-particle interaction forces. For the nanofluid considered here, a net inter-particle force depends on the particle size, volume fraction, pH, and electrolyte concentration. A solution of the discretized and coupled population balance equations can yield particle sizes as a function of time. Nanofluid prepared here consists of alumina nanoparticles with the average particle size of 150 nm dispersed in de-ionized water. As the pH of the colloid wasmore » moved towards the isoelectric point of alumina nanofluids, the rate of increase of average particle size increased with time due to lower net positive charge on particles. The rate at which the average particle size is increased is predicted and measured for different electrolyte concentration and volume fraction. The higher rate of agglomeration is attributed to the decrease in the electrostatic double layer repulsion forces. The rate of agglomeration decreases due to increase in the size of nano-particle clusters thus approaching zero rate of agglomeration when all the clusters are nearly uniform in size. Predicted rates of agglomeration agree adequate enough with the measured values; validating the mathematical model and numerical approach is employed.« less
  • The viscoplastic behavior of advanced, high temperature, metallic alloys is characterized using the Bodner Partom unified constitutive model. Material parameters for both Hastelloy-X and Aluminum alloy 8009 are obtained for this model. The Bodner-Partom constitutive model is summarized, and a detailed approach for determining the model parameters from experimental data is reviewed. Experimental methods for obtaining the mechanical test data are described. Bodner-Partom model parameters are determined from data obtained in uniaxial, isothermal, monotonic tension or compression tests and isothermal creep tests. Model predictions from the parameters determined are generated and compared to experimental data.
  • The analysis of damage and plastic deformation in metals is very important towards the full understanding of the various damage mechanisms in these materials. A coupled theory of damage mechanics and finite strain plasticity is proposed. The theory is based on a sound mathematical and mechanical background and is thermodynamically consistent. It is formulated using spatial coordinates utilizing a von Mises type yield criterion with both isotropic and kinematic hardening. The derivation is based on the concept of effective stress that was originally proposed by Kachanov for the case of uniaxial tension. The plasticity model is first formulated in amore » fictitious undamaged configuration of the body. Then certain transformation equations are derived to transform this model into a damage-plasticity model in the damaged configuration of the body. Certain assumptions are made in order to make this transformation possible. These assumptions include small elastic strains and the hypothesis of elastic energy equivalence. 39 refs., 6 figs.« less