Numerical and experimental thermal performance with entropy generation analysis on tube with helical screw tape inserts at number of strips in turbulent flow

Chaurasia, Shashank Ranjan; Sarviya, R. M.

doi:10.1177/0954406220937734

Cited by 16 publications

(14 citation statements)

References 38 publications

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“…12, 14a and 15a is that the thermal entropy generation of TPT and TECT is less than that of the PT. This is owing to heat transfer improvement with TPT and TECT as compared to PT [54]. As can be discerned, the generation of thermal entropy decreases when vortex flow increases.…”

Section: The Local Entropy Generationmentioning

confidence: 91%

Computational analysis of heat transfer augmentation and thermodynamic irreversibility of hybrid nanofluids in a tube fitted with classical and elliptical‑cut twisted tape inserts

Khfagi

Hunt

Paul

et al. 2022

J Therm Anal Calorim

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This work investigates heat transfer and entropy generation of a turbulent flow of an Al2O3–Cu/water hybrid nanofluid in a plain tube (PT) with classical (TPT) and elliptical‑cut twisted tape (TECT) inserts. The heat transfer and pressure drop are investigated numerically at Re (7000–15,000), mass concentration (1–4%), and the inlet temperature of the fluid (300 K). Further, the total entropy generation and Bejan number are examined at Re = 7000 and a mass concentration of 4%. The obtained results indicate that heat transfer can be intensified when inserting classical and elliptical‑cut twisted tape. In addition, an increase in the thermal conductivity of the fluid may cause a slight increase in the heat transfer coefficient. Moreover, heat transfer and thermal performance factors increase when the mass concentration of nanoparticles increases. The Nusselt numbers for TECT and TPT are 1.7 and 1.57 times higher than those for PT, respectively. The Nusselt number and thermal performance factor of hybrid nanofluid are greatest at roughly 195 and 1.9, respectively, showing 3.9% and 7.73% improvement compared to CuO/water nanofluid at Re = 7000. The analysis of the generation of entropy is expressed as a function of thermal and frictional contributions. The results indicate the existence of a minimum entropy generation for each type of tubes for Al2O3–Cu/water hybrid nanofluid. Total entropy generation analysis demonstrates that thermal entropy generation dominates at high heat flux. Moreover, increasing the nanoparticles decreases the generation of total entropy, which is ascribed to the thermal conductivity increment. In addition, the rate of total entropy generation declines as the vortex flow increases.

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Section: The Local Entropy Generationmentioning

confidence: 91%

Computational analysis of heat transfer augmentation and thermodynamic irreversibility of hybrid nanofluids in a tube fitted with classical and elliptical‑cut twisted tape inserts

Khfagi

Hunt

Paul

et al. 2022

J Therm Anal Calorim

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“…The main device used in the majority of thermal applications is a heat exchanger. [1][2][3] HT in the heat exchanger can be enhanced by the reduction in thermal resistance. This reduction can be achieved either by the generation of turbulence or by enhancing the effective HT area.…”

Section: Introductionmentioning

confidence: 99%

Heat transfer enhancement with channel surface roughness: A comprehensive review

Sohal

Kumar

2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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In various applications such as air conditioning, refrigeration, central heating, and chemical processing, heat losses due to thermal resistance are of considerable amount. To improve the thermo-hydraulic performance of the system involved in such applications, it is required to reduce the thermal resistance. This review article focuses on the works related to heat transfer enhancement using two types of surface roughness that are ribs and corrugations. Ribs and corrugations reduce thermal resistance by increasing surface area and creating perturbation in the flow field. This review article covers various experimental, analytical, and numerical studies related to the thermo-hydraulic performance of different working fluids flowing through the channels incorporated with surface roughness. The effects of using different working fluids that are conventional fluids, nanofluids, and hybrid nanofluids on the heat transfer performance of channels with surface roughness are also studied. Authors believe that this article will provide a basis for the advanced research on the thermo-hydraulic performance assessment of the nanofluids and hybrid nanofluids in the ribbed and corrugated channels, which will help in the enhancement of the performance of the system comprising the application of such channels.

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“…11,12 Heat pipes are being widely utilized as waste heat recovery equipment because they are highly efficient and do not cause pollution. 13,14 These pipes are similar to thermosiphons and it is useful to have adequate knowledge of their function. In this equipment, a small amount of water or other fluids are poured into the tubes, and then the air is discharged from the tube and sealed at its two ends.…”

Section: Introductionmentioning

confidence: 99%

“…The empirical results revealed that the combination was able to enhance the cooling capacity by up to 68%. In one study, 13 a mathematical model 14 was developed to determine the air velocity, hot section temperature, and charging ratio. The results indicated a productive potential in the cooling part although different capacities were also detected in the thermoelectric coolers.…”

Section: Introductionmentioning

confidence: 99%

Investigating different types of fluids in pulsating heat pipes for improving heat transfer in an air-cooled heat exchanger

Alizadeh

Movahedi

Mirzahosseini

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part A:

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Air-cooled heat exchangers are utilized in various industries to cool process fluids. To have a better heat transfer, fins are used in the structure of exchangers. In this study, a set of experiments were performed to investigate the improvement in the amount of heat transfer in an air-cooled heat exchanger. For this purpose, a real case study was conducted on air-coolers in a natural gas compressor station; afterward, the finned tubes were replaced by pulsating heat pipes (PHPs), and a different type of fluid was applied to the pulsating heat pipes. The laboratory system was set up to measure the overall heat transfer coefficient under two conditions involving either finned tubes or a PHP with R134, R22, and filled acetone fluids. Finally, the results were verified by the theory method. The results showed that all the three fluid agents (R134, R22, and Acetone) with natural convection of 9.94 m/s, an inlet fluid velocity of 5.54 m/s, and an average feed velocity were able to enhance the heat transfer coefficient by 10, 13, and 11%, respectively. In addition, compared with finned tubes, R134, R22, and Acetone improved the natural convection heat transfer coefficient by 22.2, 18.6, and 21.7%, respectively.

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Numerical and experimental thermal performance with entropy generation analysis on tube with helical screw tape inserts at number of strips in turbulent flow

Cited by 16 publications

References 38 publications

Computational analysis of heat transfer augmentation and thermodynamic irreversibility of hybrid nanofluids in a tube fitted with classical and elliptical‑cut twisted tape inserts

Computational analysis of heat transfer augmentation and thermodynamic irreversibility of hybrid nanofluids in a tube fitted with classical and elliptical‑cut twisted tape inserts

Heat transfer enhancement with channel surface roughness: A comprehensive review

Investigating different types of fluids in pulsating heat pipes for improving heat transfer in an air-cooled heat exchanger

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