Forced convection in a double tube heat exchanger using nanofluids with constant and variable thermophysical properties

Bahmani, Mohammad Hussein; Akbari, Omid Ali; Zarringhalam, Majid; Shabani, Gholamreza Ahmadi Sheikh; Goodarzi, Marjan

doi:10.1108/hff-01-2019-0017

Cited by 42 publications

(13 citation statements)

References 34 publications

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“…Later, Bahmani et al carried out a study on forced convection in a double-tube heat exchanger using nanofluids with constant thermophysical properties, considering Reynolds numbers between 100 and 1500 and employing the finite volume method for solving the governing equations. They found that heat transfer rate could be enhanced by increasing the nanoparticle volume fraction and the Reynolds number [ 68 ]. Poongavanam et al experimentally performed research on heat transfer and pressure drop using nanofluid multiwalled carbon nanotubes (MWCNT–Solar glycol) in a double-pipe heat exchanger.…”

Section: Effects Of Nanofluid Characteristics On Heat Transfer Rate A...mentioning

confidence: 99%

Application of Nanofluids in Improving the Performance of Double-Pipe Heat Exchangers—A Critical Review

et al. 2022

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Nanofluids can be employed as one of the two fluids needed to improve heat exchanger performance due to their improved thermal and rheological properties. In this review, the impact of nanoparticles on nanofluid properties is discussed by analyzing factors such as the concentration, size, and shape of nanoparticles. Nanofluid thermophysical properties and flow rate directly influence the heat transfer coefficient and pressure drop. High thermal conductivity nanoparticles improve the heat transfer coefficient; in particular, metallic oxide (such as MgO, TiO2, and ZnO) nanoparticles show greater enhancement of this property by up to 30% compared to the base fluid. Nanoparticle size and shape are other factors to consider as well, e.g., a significant difference in thermal conductivity enhancement from 6.41% to 9.73% could be achieved by decreasing the Al2O3 nanoparticle size from 90 to 10 nm, affecting nanofluid viscosity and density. In addition, equations to determine the heat transfer rate and the pressure drop in a double-pipe heat exchanger are presented. It was established that the main factor that directly influences the heat transfer coefficient is the nanofluid thermal conductivity, and nanofluid viscosity affects the pressure drop.

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Section: Effects Of Nanofluid Characteristics On Heat Transfer Rate A...mentioning

confidence: 99%

Application of Nanofluids in Improving the Performance of Double-Pipe Heat Exchangers—A Critical Review

et al. 2022

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“…The pressure-velocity equations were coupled together by implementing the SIMPLE (Semi Implicit Method for Pressure Linked Equations) algorithm [35,36], while the discretization of equations was defined by implementing the second-order upwind [37,38]. The residual criteria were set equal to 10 −7 for all equations to ensure the calculations' accuracy [33,39]. The turbulence was modeled using RNG k-ε.…”

Section: Numerical Proceduresmentioning

confidence: 99%

Combination Effect of Baffle Arrangement and Hybrid Nanofluid on Thermal Performance of a Shell and Tube Heat Exchanger Using 3-D Homogeneous Mixture Model

Alazwari

Safaei

2021

Mathematics

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In this study, thermal performance and flow characteristics of a shell and tube heat exchanger equipped with various baffle angles were studied. The heat exchanger was operated with distilled water, and a hybrid nanofluid at three concentrations of 0.04% and 0.10% of GNP-Ag/water within Reynolds numbers ranged between 10,000 and 20,000. The thermophysical properties of nanofluid varied with temperature and nanoparticles’ concentration. The baffle angles were set at 45°, 90°, 135°, and 180°. Results showed that the calculated Nusselt number (Nu) could be improved by adding nanoparticles to the distilled water or increasing the fluid’s Reynolds number. At a low Re number, the Nu corresponding to baffle angle of 135° was very close to that recorded for the angle of 180°. At Re = 20,000, the Nu number was the highest (by 35% compared to the reference case), belonging to a baffle angle of 135°. Additionally, results related to friction factor and pressure drop showed that more locations with fluid blocking were observed by increasing the baffle angle, resulting in increased pressure drop value and friction. Finally, the temperature streamlines counter showed that the best baffle angle could be 135° in which maximum heat removal and the best thermal performance can be observed.

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“…Tian et al [36] experimentally measured heat transfer in a silica DI water nano-fluid with three various surfactants on the surface of copper heaters at different concentrations at atmospheric pressure. Forced convection in a double-tube heat exchanger using nanofluids with constant and variable thermophysical properties was scrutinized by Bahman et al [37].…”

Section: Literature Surveymentioning

confidence: 99%

Heat and Mass Transfer in Hydromagnetic Second-Grade Fluid Past a Porous Inclined Cylinder under the Effects of Thermal Dissipation, Diffusion and Radiative Heat Flux

et al. 2020

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Current disquisition is presented to excogitate heat and mass transfer features of second grade fluid flow generated by an inclined cylinder under the appliance of diffusion, radiative heat flux, convective and Joule heating effects. Mathematical modelling containing constitutive expressions by obliging fundamental conservation laws are constructed in the form of partial differential equations. Afterwards, transformations are implemented to convert the attained partial differential system into ordinary differential equations. An implicit finite difference method known as the Keller Box was chosen to extract the solution. The impact of the flow-controlling variables on velocity, temperature and concentration profiles are evaluated through graphical visualizations. Variations in skin friction, heat transfer and mass flux coefficients against primitive variables are manipulated through numerical data. It is inferred from the analysis that velocity of fluid increases for incrementing magnitude of viscoelastic parameter and curvature parameter whereas it reduces for Darcy parameter whereas skin friction coefficient decreases against curvature parameter. Assurance of present work is manifested by constructing comparison with previous published literature.

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Forced convection in a double tube heat exchanger using nanofluids with constant and variable thermophysical properties

Cited by 42 publications

References 34 publications

Application of Nanofluids in Improving the Performance of Double-Pipe Heat Exchangers—A Critical Review

Application of Nanofluids in Improving the Performance of Double-Pipe Heat Exchangers—A Critical Review

Combination Effect of Baffle Arrangement and Hybrid Nanofluid on Thermal Performance of a Shell and Tube Heat Exchanger Using 3-D Homogeneous Mixture Model

Heat and Mass Transfer in Hydromagnetic Second-Grade Fluid Past a Porous Inclined Cylinder under the Effects of Thermal Dissipation, Diffusion and Radiative Heat Flux

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