Experimental investigation of surface vibration effects on increasing the stability and heat transfer coeffcient of MWCNTs-water nanofluid in a flexible double pipe heat exchanger

Hosseinian, Ali; Isfahani, Amir Homayoon Meghdadi; Shirani, Ebrahim

doi:10.1016/j.expthermflusci.2017.09.018

Cited by 82 publications

(22 citation statements)

References 31 publications

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“…Shows a comparison between the results of present work with eqns. (11) and (12). The dash line signalizes of our experimental results, whilst the solid lines match to the indicated above correlations.…”

supporting

confidence: 82%

“…Hossenian et.al. [11] investigated the effect of the surface vibrations on the stabilization and coefficient of heat transfer of nano-fluid (MWCNTs-water) in an elastic dual pipe heat exchanger. It was concluded that by increasing the flow rate, temperature, concentration of nano-fluid and vibration amplitude, the coefficient of heat transfer increases.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Investigation of The Influence of Mechanical Forced Vibrations and Heat Flux on Coefficient of Heat Transfer

Bash

Alkumait

Yaseen

2018

SJUOZ

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The aim of this paper to verify the influence of vertical forced vibration on the coefficient of heat transfer of the laminar internal flow in a spiral fluted tube. With adopted the water as a working fluid, and flowing Reynolds numbers at the entrance between 228 and 1923, the tube heated under constant heat flux levels ranging from 618-3775 W/m2. The frequencies of vibration ranging from 13 to 30 Hz, and the amplitudes of vibration from 0.001 to 0.002 mm. The results appeared that the coefficient of heat transfer significantly affected by mechanical forced vibration in a flowing of the heated tube. When the vibration amplitude increases, the Nusselt number Significantly increases, with the maximum increases of 8.4% at the amplitude of vibration 0.0022 mm and the frequency 13 Hz. Generally, the coefficient of heat transfer increases with increasing Reynolds number and heat flux. At last, by using the parameters of vibration amplitude, frequency, heat flux and Reynolds number, a new correlation has been derived depends on experimental data.

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supporting

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of The Influence of Mechanical Forced Vibrations and Heat Flux on Coefficient of Heat Transfer

Bash

Alkumait

Yaseen

2018

SJUOZ

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“…[28], CTAB in Ref. [29], and SDS in Ref. [30] were used as surfactants for dispersion of nanoparticles in the base fluid.…”

Section: Stability Of Nanofluidmentioning

confidence: 99%

Effect of various surfactants on stability and thermophysical properties of nanofluids

Wang

et al. 2020

J Therm Anal Calorim

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The effect of Fe 3 O 4 nanoparticles and carbon nanotubes (CNTs) on the viscosity of a nanofluid is experimentally investigated from 278 to 313 K by changing the nanoparticle volume fraction. These nanoparticles were put into distilled water with various surfactants, i.e., Colace (docusate sodium), trisodium citrate dihydrate (TSC), polyvinyl pyrrolidone, cetyl trimethylammonium bromide, tetramethylammonium hydroxide (TMAH), acacia senegal (GA), sodium dodecyl benzene sulfonate, sodium dodecyl sulfate (SDS), and sodium laurylsulfonate (SLS). Based on the present measurements, new empirical formulas are proposed for Fe 3 O 4-water, CNT-water and Fe 3 O 4-CNT-water nanofluids to provide accurate predictions for the nanofluid viscosity. Based on the viscosity testing, stabilities and thermal conductivities of Fe 3 O 4-TMAH, Fe 3 O 4-Colace, Fe 3 O 4-TSC, CNT-SDS, CNT-GA, Fe 3 O 4-CNT-SLS, and Fe 3 O 4-CNT-TSC nanofluids with a volume concentration of 0.5% are investigated in the present research. Results indicate that better stability, smaller viscosity, and higher thermal conductivity are obtained, when the surfactants TMAH, SDS, and SLS are added into the Fe 3 O 4-water, CNT-water, and the Fe 3 O 4-CNT-water nanofluid, respectively. The CNT-water and Fe 3 O 4-CNT-water nanofluids exhibit a shear-thinning behavior, whereas a linear rheological behavior can be observed by water-based Colace-Fe 3 O 4 , TMAH-Fe 3 O 4 , and TSC-Fe 3 O 4 nanofluids. Keywords Nanofluid • Thermal conductivity • Carbon nanotube • Viscosity • Surfactant List of symbols k Thermal conductivity (W m −1 K −1) T Temperature (K) U Uncertainty Greek symbols θ Surfactant ratio fraction μ Dynamic viscosity (Pa s) φ Nanoparticle volume fraction Subscripts f Base fluid nf Nanofluid

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“…Hence imposing the vibration for low flow rate heat exchangers is useful. N.C. Willis et.al [12] in this the performance of the cross flow heat exchanger is determined. Effectiveness factor are determine for a wide range of operating parameters for single pass and multi pass heat exchanger The basic analysis and method of presentation of result used in this for single pass three fluid cross flow heat exchanger was extended to multiple passes.…”

Section: IImentioning

confidence: 99%

Advancement in Triple Flow Heat Exchanger using Vibration

Kamble¹

2019

IJRASET

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An advancement in triple flow heat exchanger using vibration has been carried out with different flow arrangements that is hot fluid at middle of pipe where as cold fluid passed remaining two pipes with counter and cross flow types. So that surface area of heat exchanger will be increases and more heat transfer takes place. For creating theturbulence in fluid flow inside the arrangement we can use vibrator at lower side of the concentric pipe so that transfer of heat from one pipe to other are more with the turbulent flow and increase the (LMTD) logarithmic mean temperature difference. The main aim of arrangement is to increase the heat transfer using three pipes and vibrator arrangement.

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Experimental investigation of surface vibration effects on increasing the stability and heat transfer coeffcient of MWCNTs-water nanofluid in a flexible double pipe heat exchanger

Cited by 82 publications

References 31 publications

Experimental Investigation of The Influence of Mechanical Forced Vibrations and Heat Flux on Coefficient of Heat Transfer

Experimental Investigation of The Influence of Mechanical Forced Vibrations and Heat Flux on Coefficient of Heat Transfer

Effect of various surfactants on stability and thermophysical properties of nanofluids

Advancement in Triple Flow Heat Exchanger using Vibration

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