Heat transfer and pressure drop performance of alumina–water nanofluid in a flat vertical tube of a radiator

Sokhal, Gurpreet Singh; Gangacharyulu, D.; Bulasara, Vijaya Kumar

doi:10.1080/00986445.2017.1387853

Cited by 24 publications

(5 citation statements)

References 56 publications

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“…In addition, if a rectangular double‐layer microchannel is used, a greater wall temperature decrement than a triangular double‐layer microchannel heat sink occurs. Sokhal et al 17 found that boosting the volumetric fraction of nanoparticles increases the heat transfer coefficient. In addition, with raising the volumetric fraction of nanoparticles, the friction coefficient and consequently the pumping power increase 16,17 .…”

Section: Introductionmentioning

confidence: 99%

“…Sokhal et al 17 found that boosting the volumetric fraction of nanoparticles increases the heat transfer coefficient. In addition, with raising the volumetric fraction of nanoparticles, the friction coefficient and consequently the pumping power increase 16,17 . In a numerical simulation, Sarvar‐ardeh et al 18 studied the effect of using hybrid nanofluids on the performance of silicon double‐layer microchannels.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, with raising the volumetric fraction of nanoparticles, the friction coefficient and consequently the pumping power increase. 16,17 In a numerical simulation, Sarvar-ardeh et al 18 studied the effect of using hybrid nanofluids on the performance of silicon double-layer microchannels. They checked the cases with the constant Re numbers and constant flow rates to show the effect of the nanoparticles volume concentration on the base temperature.…”

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confidence: 99%

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Heat transfer and entropy generation of hybrid nanofluid inside the convergent double‐layer tapered microchannel

Sarvar-Ardeh

Rafee

Rashidi

2022

Math Methods in App Sciences

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When designing microscale heat exchangers, the reduction of energy dissipation and improved system performance in terms of heat transfer and fluid flow should be considered. Some methods, such as the use of nanofluids and convergent walls in the microchannel heat sinks, can be helpful. In this study, the hydrothermal performance and entropy generation of alumina‐silica/water hybrid nanofluid in the double‐layer tapered microchannel are investigated using the three‐dimensional simulation. The flow Re number and the volumetric fraction of the nanoparticles vary in the ranges of 50 to 400 and 0% to 5%, respectively. Numerical results show that by using the convergent microchannel, in addition to decreasing the maximum base surface temperature, the temperature gradient also becomes more uniform. Boosting the volumetric fraction of nanoparticles and decreasing the tapered factor (TF) reduce the thermal resistance of the system but cause higher pumping powers. At Re = 400 and φ = 5%, when the convergence factor of the channel reduces from 1 to 0.4, pumping power will increase 149% but the thermal resistance reduction about 12%. At lower Re numbers, the effects of channel convergence on enhancing the mean Nu number are greater than the cases with higher Re numbers. In general, boosting the convergence of the channel increases the frictional entropy generation and diminishes the thermal entropy generation. At Re = 200 and φ = 5%, by decreasing the tapered ratio from TF = 1 to TF = 0.4, the frictional entropy generation will double and the thermal entropy generation will reduce by 7.9%.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Heat transfer and entropy generation of hybrid nanofluid inside the convergent double‐layer tapered microchannel

Sarvar-Ardeh

Rafee

Rashidi

2022

Math Methods in App Sciences

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“…The nanofluids selected for this study are alumina, CuO, and carbon nanotubes. These nano-fluids are selected due to their capability of producing high heat transfer performance through flat tubes [52,53]. The study conducted by Selimefendigil et al [54] also concludes that inclusion of CNT nanoparticles in the base fluid resulted in the performance coefficient enhancement of 52% at the highest solid volume fraction.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of the Performance of Applying Different Nanofluids in a Tube with a 90° Bend at the Center of the Tube

Kumar

Sokhal

Khalilpoor

et al. 2021

Journal of Nanomaterials

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This research manuscript addresses the study of the performance of a flat tube having a 90° bend under the flow of three different nanofluids such as copper oxide, multiwalled carbon nanotubes, and aluminum oxide/water nanofluids at different inlet fluid temperatures and Reynolds numbers. The performance of the flat tube is analyzed under the Reynolds number between 5000 and 11000 and a fluid inlet temperature range of 35°C–50°C. The results obtained in this study show that the heat transfer coefficient increases with the increase in volume concentration as well as Reynolds number. The maximum heat transfer coefficient is obtained using multiwalled carbon nanotubes followed by copper oxide and then aluminum oxide. This study also illustrates that the friction factor increases with the increase in volume concentration and decrease in Reynolds number. The results of the numerical study have been validated with the help of an experimental study. The study has proved that the use of nanofluids instead of the conventional fluid can lead to reducing the size of the tube for the same amount of heat transfer which can prove the reduction of the size in heat transfer equipment. Furthermore, it is also observed in this study that the presence of the 90° bend in the flat tube improved the heat transfer performance due to the increased turbulence at the bent section of the tube.

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“…The improvement in the performance of heat transfer devices can be mentioned as a promising method to obviate this issue [9,10,11,12,13]. The application of nanofluids is also one technique to enhance the performance of heat transfer devices [14,15,16,17,18]; on the other hand, this is not possible to use the nanofluids in all industries due to some higher cost of operating. An active method of air or gas injection in fluids has been introduced to create the turbulence in the heat transfer devices so that more energy can be transferred, which leads to a minimum loss of energy.…”

Section: Abbreviations Introductionmentioning

confidence: 99%

Experimental investigation of heat transfer and exergy loss in heat exchanger with air bubble injection technique

Sokhal

Dhindsa

Sokhal

et al. 2020

J Therm Anal Calorim

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The main aim of this study is to evaluate thermal performance and exergy analysis of a shelland-tube heat exchanger with a new technique called air bubble injection. The study has been carried out with different parameters such as flow rate, fluid inlet temperature, and different air injection techniques. The air has been injected at different locations such as the inlet of pipe, throughout the pipe, and in the outer pipe of the heat exchanger. Based on the results, the performance of the heat exchanger enhances with an increase in the flow rate and the fluid inlet temperature. The exergy loss and dimensionless exergy loss increase with a rise in the flow rate. The maximum and dimensionless exergy losses are obtained at a maximum flow rate of 3.5 l min −1 . With the air bubble injection in the heat exchanger, it has been observed that the temperature difference increases, which leads to an increase in the exergy loss. The injecting air bubbles throughout the tube section shows that minimum dimensionless exergy is 27.49% concerning no air injection.

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Heat transfer and pressure drop performance of alumina–water nanofluid in a flat vertical tube of a radiator

Cited by 24 publications

References 56 publications

Heat transfer and entropy generation of hybrid nanofluid inside the convergent double‐layer tapered microchannel

Heat transfer and entropy generation of hybrid nanofluid inside the convergent double‐layer tapered microchannel

Numerical Simulation of the Performance of Applying Different Nanofluids in a Tube with a 90° Bend at the Center of the Tube

Experimental investigation of heat transfer and exergy loss in heat exchanger with air bubble injection technique

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