Numerical study of heat transfer and friction factor in a tube with groove and rib on the wall

Hajabdollahi, Hassan; Salarmofrad, Masoud; Shamsi, Sajjad; Rezaeian, Mohsen

doi:10.1002/htj.21659

Cited by 6 publications

(2 citation statements)

References 35 publications

(44 reference statements)

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“…However, an increment in the pressure drop was observed for both hybrid nanofluids. Thus, a comprehensive evaluation factor, namely, the PI, is introduced to evaluate the thermohydraulic performance of the nanofluids and hybrid nanofluids in the MCHS 4,36,66,67 . The nanofluid is said to be advantageous over the base fluid when PI is higher than one.…”

Section: Combined Thermohydraulic Characteristicsmentioning

confidence: 99%

Thermohydraulic performance improvement and entropy generation characteristics of a microchannel heat sink cooled with new hybrid nanofluids containing ternary/binary hybrid nanocomposites

Souby

Bargal

Wang

2021

Energy Science & Engineering

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Recently, the combination of hybrid nanofluids with microchannel heat sinks (MCHSs) has led to superior heat removal from high heat flux electronics chips.The present work aimed to evaluate numerically the first and second law performances of MCHSs using the new cost-effective binary/ternary hybrid nanofluids. Water-based binary and ternary hybrid nanofluids include the MgO/ TiO 2 nanocomposite and the CuO/MgO/TiO 2 nanocomposite, respectively. The effects of the hybrid nanofluid volume concentration (vol.%) and Reynolds number (Re) on the heat transfer, pressure drop, combined thermohydraulic characteristics, and entropy generation characteristics of the MCHSs are discussed.The results show that higher values of the convective heat transfer coefficient, pressure drop, and frictional entropy generation rate are obtained when using hybrid nanofluids with high Re and vol.% values. Furthermore, by increasing the Re and vol.% values of the hybrid nanofluids, the bottom wall temperature, total thermal resistance, and thermal entropy generation rate decreased, and an increased temperature uniformity was obtained on the bottom surface of the MCHSs. In conclusion, the applied hybrid nanofluids are considered to be more promising heat transfer fluids when compared with conventional fluids such as water. Particularly, the CuO/MgO/TiO 2 -water ternary hybrid nanofluid exhibited a better heat transfer efficiency than did the MgO/TiO 2 -water binary hybrid nanofluid.

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Section: Combined Thermohydraulic Characteristicsmentioning

confidence: 99%

Thermohydraulic performance improvement and entropy generation characteristics of a microchannel heat sink cooled with new hybrid nanofluids containing ternary/binary hybrid nanocomposites

Souby

Bargal

Wang

2021

Energy Science & Engineering

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“…Córcoles et al took the corrugation's width into account while characterizing the influence on performances by bringing in a new nondimensional parameter, the corrugation shape factor (CSF). In recent researches, Hajabdollahi et al 31 presented the correlations for Nu and f versus Re . Also, they defined a good criterion, thermal performance enhancement factor, for the selection of the optimum turbulator and their parameters by investigating the thermal and hydraulic performance of the tube with groove and rib.…”

Section: Introductionmentioning

confidence: 99%

Effect of outline curvature degree on heat transfer and flow characteristics inside dimpled tubes and spirally grooved tubes

2021

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The flow behaviors and heat transfer characteristics have been studied inside the dimpled tubes and spirally grooved tubes with different curvature degrees, which is considered for the first time within the influence factors. A three‐dimensional numerical simulation by periodic boundary conditions is performed to model the fully developed flow of dimpled and grooved sections to acquire the finer mesh and more accurate results. In addition, the dimple and groove outlines with different curvature degrees are generated by polynomial functions. Effects of curvature degrees for dimpled tubes and spirally grooved tubes on flow, heat transfer, and comprehensive performances are discussed. The results indicate that the influence of curvature degrees for dimpled tubes exhibit an opposite behavior when compared with those for spirally grooved tubes. On the whole, all performance factors increase with the growing curvature degree for dimpled tubes but decrease with the increasing curvature degree for spirally grooved tubes. By comparing different curvature degrees, the maximum ranges of heat transfer enhancement are 1.50–2.22 and 2.54–2.82, respectively, for dimpled and grooved tubes with respect to Re. Thermal and hydraulic fields are considered to analyze the mechanism of heat transfer enhancement. The analysis shows that the way the dimple changes thermohydraulic properties differs from the way the groove changes the properties.

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Assessment of TiO2 water-based nanofluids with two distinct morphologies in a U type evacuated tube solar collector

Hosseini

Dehaj

2021

Applied Thermal Engineering

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Numerical study of heat transfer and friction factor in a tube with groove and rib on the wall

Cited by 6 publications

References 35 publications

Thermohydraulic performance improvement and entropy generation characteristics of a microchannel heat sink cooled with new hybrid nanofluids containing ternary/binary hybrid nanocomposites

Thermohydraulic performance improvement and entropy generation characteristics of a microchannel heat sink cooled with new hybrid nanofluids containing ternary/binary hybrid nanocomposites

Effect of outline curvature degree on heat transfer and flow characteristics inside dimpled tubes and spirally grooved tubes

Assessment of TiO2 water-based nanofluids with two distinct morphologies in a U type evacuated tube solar collector

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