Experimental investigation on heat transfer of n-decane-ZnO nanofluids in a horizontal tube under supercritical pressure

Han, Zhixiong; Zhou, Weixing; Yu, Wangyang; Jia, Zhenjian

doi:10.1016/j.icheatmasstransfer.2021.105108

Cited by 14 publications

(2 citation statements)

References 53 publications

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“…Many researchers focused on heat transfer enhancement technology in regenerative cooling (Ulas and Boysan 2013;Brinda and Sumangala 2016;Feng et al, 2017;Pu et al, 2018;Zuo et al, 2018;Han et al, 2021;Liu et al, 2022;Luo et al, 2022). Han et al (2021) intended to improve the heat transfer performance of n-decane under supercritical pressure in horizontal tubes by adding ZnO nanofluids and summed up heat transfer corrections in detail. Ulas and Boysan, (2013) analyzed the thermodynamic characteristics in triangle-shaped micro-cooling channels with different aspect ratios.…”

Section: Introductionmentioning

confidence: 99%

Heat transfer and flow structures of supercritical n-decane in a regenerative cooling channel loaded with non-uniform heat flux

Liu

Ma³

et al. 2022

Front. Energy Res.

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A harsh and complex thermal environment in the combustor threatens safe working of scramjets. In this study, heat transfer and flow structures of supercritical n-decane under 3 MPa in a regenerative cooling channel loaded with non-uniform heat flux distributions are investigated, including uniform, sinusoidal, increased, and decreased heat flux distributions. A verified k–ω SST turbulence model was employed, and a corresponding mesh independence study was performed. From this work, the fluid temperature at the outlet of the heated channel is only determined by the averaged heat flux, and all the regenerative cooling channels achieve the same temperature although loaded with different heat flux distributions. Compared with the fluid temperature, the wall temperature distribution is more sensitive to the variations of heat flux distribution. The regenerative cooling channels loaded with the sinusoidal heat flux distributions exist in several high-temperature regions, and the channel loaded with linear distributions changes the trend of temperature distribution. A larger temperature gradient is found in the regenerative cooling channel wall with a lower thermal conductivity. This work provides a good insight into the characteristics of the flow and temperature field of regenerative cooling channels loaded with non-uniform heat flux considering the effect of conjugate heat transfer.

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Section: Introductionmentioning

confidence: 99%

Heat transfer and flow structures of supercritical n-decane in a regenerative cooling channel loaded with non-uniform heat flux

Liu

Ma³

et al. 2022

Front. Energy Res.

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“…Han et al have investigated the heat transfer performances of n-decane-ZnO nanofluid which is pressurized below supercritical pressure and flowing through a horizontal tube. The heat transfer and Nusselt number of n-decane-ZnO nanofluid have increased 20% under a supercritical pressure [22]. Akbar et al have concluded that the hybrid nanofluid of alumina and titanium with low volume concentrations presents 30% enhanced heat transfer compared to water for a horizontal heated tube [23].…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigations on Heat Transfer Characteristics of Single Particle and Hybrid Nanofluids in Uniformly Heated Tube

Garud

Lee

2021

Symmetry

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In the present study, the heat transfer characteristics, namely, heat transfer coefficient, Nusselt number, pressure drop, friction factor and performance evaluation criteria are evaluated for water, Al2O3 and Al2O3/Cu nanofluids. The effects of Reynolds number, volume fraction and composition of nanoparticles in hybrid nanofluid are analyzed for all heat transfer characteristics. The single particle and hybrid nanofluids are flowing through a plain straight tube which is symmetrically heated under uniform heat flux condition. The numerical model is validated for Nusselt number within 7.66% error and friction factor within 8.83% error with corresponding experimental results from the previous literature study. The thermophysical properties of hybrid nanofluid are superior to the single particle nanofluid and water. The heat transfer coefficient, Nusselt number and pressure drop show increasing trend with increase in the Reynolds number and volume fraction. The friction factor shows the parabolic trend, and the performance evaluation criteria shows small variations with change in Reynolds number. However, both friction factor and performance evaluation criteria have increased with increase in the volume fraction. The 2.0% Al2O3/Cu with equal composition of both nanoparticles (50/50%) have presented superior heat transfer characteristics among all working fluids. Further, the heat transfer characteristics of 2.0% Al2O3/Cu hybrid nanofluid are enhanced by changing the nanoparticle compositions. The performance evaluation criteria for 2.0% Al2O3, 2.0% Al2O3/Cu (50/50%), 2.0% Al2O3/Cu (75/25%) and 2.0% Al2O3/Cu (25/75%) are evaluated as 1.08, 1.11, 1.10 and 1.12, respectively.

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Thermophysical and optical properties of the hybrid nanofluids

Malika,

Sonawane,

Sharifpur

2025

Hybrid Nanofluids for Application in the Chemical and Petroleum Industry

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Experimental investigation on heat transfer of n-decane-ZnO nanofluids in a horizontal tube under supercritical pressure

Cited by 14 publications

References 53 publications

Heat transfer and flow structures of supercritical n-decane in a regenerative cooling channel loaded with non-uniform heat flux

Heat transfer and flow structures of supercritical n-decane in a regenerative cooling channel loaded with non-uniform heat flux

Numerical Investigations on Heat Transfer Characteristics of Single Particle and Hybrid Nanofluids in Uniformly Heated Tube

Thermophysical and optical properties of the hybrid nanofluids

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