Heat transfer enhancement of TiO2-water nanofluid flow in dimpled tube with twisted tape insert

Eiamsa-ard, Smith; Wongcharee, K.; Kunnarak, K.; Kumar, Manoj; Chuwattabakul, V.

doi:10.1007/s00231-019-02621-1

Cited by 50 publications

(12 citation statements)

References 29 publications

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“…One of such inserts is a twisted tape, which is easy to produce and use. Improvements in heat transfer coefficient by inserting a twisted tape are documented in turbulent channel flow by Sundar, et al [42] with both pure water and 0.5% volume Al2O3 nanofluid, by Eiamsa-ard, et al [43] with TiO2 nanofluid through a dimpled tube, and by Kumar, et al [44,45] with air using a twisted tape with perforations. Heat transfer coefficient improvements are reported in laminar and turbulent channels by Akbari, et al [46], who explored the effect of tape twist pitch, width, and nanoparticle concentration.…”

Section: Introductionmentioning

confidence: 98%

Thermo-hydraulic performance of a circular microchannel heat sink using swirl flow and nanofluid

Ali

Rona

Kadhim

et al. 2021

Applied Thermal Engineering

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Section: Introductionmentioning

confidence: 98%

Thermo-hydraulic performance of a circular microchannel heat sink using swirl flow and nanofluid

Ali

Rona

Kadhim

et al. 2021

Applied Thermal Engineering

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“…Duangthongsuk and Wongwises [17] worked an experimental study on the heat transfer performance and pressure drop of TiO 2 -water nanofluids flowing under a turbulent flow regime, and Arulprakasajothi et al [69] also observed the effect of TiO 2 -water nanofluid in tube heat exchanger. Eiamsa-ard et al [64] also studied TiO 2water nanofluid in the dimpled tube with twisted tape inserts. Azmi et al [18] investigated the comparison of convective heat transfer coefficient and friction factor of TiO 2 nanofluid flow in a tube with twisted tape inserts.…”

Section: Introductionmentioning

confidence: 99%

Determination and measurement of some thermophysical properties of nanofluids and comparison with literature studies

2021

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The thermophysical properties of nanofluids must be determined to evaluate their thermal performances like heat transfer, convection heat transfer coefficient, Nusselt number. The purpose of this study is to obtain the thermophysical properties of nanofluids. Al2O3, TiO2, and ZnO are used as a nanoparticle, while deionized water is used as base fluid. The solutions included nanoparticles in a way to be each with 0.5%, 0.7%, and 1.0% volumetric concentration were prepared. SDS was added to the solutions as a surfactant to prevent instability that occurred due to agglomeration and sedimentation. For thermal conductivity measurement, the device that works by the transient hot-wire method was used between 30-60?C temperatures. Also, for viscosity measurement, the device that works as based on the vibrating plate method was used between 20-50?C temperatures. Density and specific heat values are obtained with the help of the well-known equations while thermal conductivity and viscosity are measured. Thanks to this study, it is emphasized how thermophysical properties of nanofluids change according to temperature and volumetric concentration. Moreover, their curve fitting equations are obtained. All of the thermophysical properties compared with the studies in the literature. It is established that the thermal conductivity of nanofluids is proportional to temperature, and viscosity of it is proportional to volumetric concentrations but inversely with temperature. Finally, the effects of the augmentation in dynamic viscosity on pumping power were considered as well as the increase in thermal conductivity; thus, no abnormal heat transfer enhancement was observed.

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“…This study covers Reynolds numbers ranging from 5,000 to 15,000. However, these dimple surface studies boosted up the blending of fluid, creating secondary flow and enhanced thermodynamic properties through the tube [9]. M. Jafaryar et al investigated the characteristics of heat transfer using CuO-H2O nanofluid consisting of a twisted-tape insert in a heat exchanger.…”

Section: Introductionmentioning

confidence: 99%

Heat Transfer Characteristics Analysis of a Nanofluid in a Tube with a Co-axial Twisted Tape Inserter: A Numerical Approach

Alam

Inam

2021

J. eng. adv.

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This study demonstrates the forced convection heat transfer of a water-based nanofluid inside a circular tube with a twisted tape inserter. During these simulations, it was assumed that the tube wall heated with constant heat flux, inlet of the tube had a lower temperature and Titanium Oxide (TiO2) particles were used as nanoparticles for nanofluid mixture. The results depict the effect of some significant parameters, i.e., twist ratio (T.R.), number of twists, Reynolds number, and volume fractions of nanoparticles on the heat transfer characteristics inside the tube with a twisted tape inserter. It is visualized from the numerical results that the Nusselt number (Nu) and heat transfer co-efficient have higher values at the twisted region than the outlet. During this numerical simulation, the Reynolds number (Re), volume fractions of particles, and twist ratios were varied into the range from 100 to 500, 0 to 0.1, and 1 to 5, respectively. Mixture model conducted these numerical simulations with Direct Numerical Simulation (DNS) method using ANSYS Fluent 16.2 with the help of three-dimensional Navier-Stokes equation. The results depicted for both water and nanofluid, the average Nusselt number and heat transfer co-efficient enhance at lower twist ratios and a higher number of twists. Results also show that Nusselt number and heat transfer coefficient increase with Reynolds Number. The heat transfer characteristics of twisted-tape inserter portion and their differences of those characteristics with the tube outlet were investigated numerically and graphically.

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Heat transfer enhancement of TiO2-water nanofluid flow in dimpled tube with twisted tape insert

Cited by 50 publications

References 29 publications

Thermo-hydraulic performance of a circular microchannel heat sink using swirl flow and nanofluid

Thermo-hydraulic performance of a circular microchannel heat sink using swirl flow and nanofluid

Determination and measurement of some thermophysical properties of nanofluids and comparison with literature studies

Heat Transfer Characteristics Analysis of a Nanofluid in a Tube with a Co-axial Twisted Tape Inserter: A Numerical Approach

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