Analysis of thermal efficiency of a corrugated double-tube heat exchanger with nanofluids

Zheng, Dan; Du, Jianqiang; Wang, Wei; Klemeš, Jiří Jaromír; Wang, Jin; Sundén, Bengt

doi:10.1016/j.energy.2022.124522

Cited by 23 publications

(11 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Results showed a substantial thermal performance improvement of about 7.30% with 2% volume concentration for Al 2 O 3 nanoparticles and 4.20% for TiO 2 nanoparticles. Investigating the impact of flow rates on smooth and corrugated double‐tube heat exchangers, Zheng et al 24 found that the use of nanofluids and thread structures can enhance their thermal performance. Similarly, a study by Hasan et al 25 analyzed the heat transfer performance of a helical heat exchanger with different water‐based nanofluids, and found that Al 2 O 3 exhibited the highest heat transfer rate while SiO 2 performed the least efficiently.…”

Section: Introductionmentioning

confidence: 99%

Thermal performance investigation of N‐shape double‐pipe heat exchanger using Al₂O₃, TiO₂, and Fe₃O₄‐based nanofluids

Salim,

Jihan,

Das

et al. 2024

Energy Science & Engineering

View full text Add to dashboard Cite

Researchers and engineers are actively working on enhancing the efficiency of heat exchangers in engineering applications by developing novel designs, exploring new materials, and utilizing nanofluids. Three kinds of nanofluids with varying concentrations are investigated in this paper. The objective is to assess the performance of N‐shaped double‐pipe heat exchanger used in thermoelectric power plants. The performance has been evaluated using COMSOL Multiphysics software. The findings show that higher nanofluid concentrations resulted in elevated heat transfer coefficients and improved efficiency of N‐shape double pipe heat exchanger. The analysis revealed that a mere 1% rise in the volume fraction of nanofluids enhanced the efficiency of the heat exchanger on average 23% when compared to the base fluid (water). In comparison to the N‐shape double pipe (Inconel 625) heat exchangers, the N‐shape double pipe (copper) heat exchangers appear to be more efficient. The introduction of nanoparticles has a notable impact on the heat transfer coefficients. Specifically, within an N‐shaped double pipe (copper) heat exchanger, the inclusion of a 1% volume fraction results in a 2.09% enhancement in the heat transfer coefficient for Al2O3/water, a 1.3% improvement for Fe3O4/water, and a 1.15% increase for TiO2/water. It also exposed that adding 1% Al2O3/water led to a significant 0.623% increase in effectiveness, while TiO2/water showed a 0.259% rise, and Fe3O4/water exhibited a 0.375% improvement. Moreover, increasing the Reynolds number enhances the Nusselt number for Al2O3/water and Fe3O4/water nanofluids by 55.22%, and for TiO2/water by 54.60% at a 6% volume concentration, leading to additional increases in exchanger efficiency. Therefore, the augmentation in nanofluid concentration leads to a reduction in the temperature pinch points both at the intake and outflow. This observation suggests that nanofluids exhibit a superior ability compared to conventional fluids when it comes to effectively lowering temperatures.

show abstract

Section: Introductionmentioning

confidence: 99%

Thermal performance investigation of N‐shape double‐pipe heat exchanger using Al₂O₃, TiO₂, and Fe₃O₄‐based nanofluids

Salim,

Jihan,

Das

et al. 2024

Energy Science & Engineering

View full text Add to dashboard Cite

show abstract

“…In double tube heat exchanger hot fluids lose heat and cold fluids gain heat [1]. Three principles-conduction, convection, and radiation-govern heat transfer, with radiation being negligible compared to conduction and convection in heat exchangers [2,3]. Conduction occurs when heat from a higher temperature fluid passes through the surrounding solid wall [4].…”

Section: Introductionmentioning

confidence: 99%

“…The results demonstrate remarkable enhancements in Nu and friction coefficient, with maximum improvements of 32.7% and 30% in average Nu and PEC, respectively. Zhend D et al [2] investigated the Nanofluids and thread structures on the tubes to intensify heat transfer. Combined use of thread structure and nanofluids achieves a 59% increase in overall thermal performance.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Thermo-Hydraulic Performance using Water-Based Alumina Nanofluids: A Numerical Investigation

Raj,

Kumar,

Hussein

et al. 2024

E3S Web of Conf.

View full text Add to dashboard Cite

This study investigates the heat transfer and fluid flow characteristics of pure water passing through a double tube heat exchanger (DTHX). Computational fluid dynamics (CFD) simulations were conducted using ANSYS-FLUENT 22 R1 software. Mathematical models and thermophysical properties of nanofluids and water from existing literature were employed. The comparison focused on pure water and 1% Al2O3/H2O nanofluids. Various operating variables such as Reynolds number and temperature were considered across the inner and outer tubes. The Reynolds number ranged from 2500 to 5500 at 80°C for the inner tube and 2500 at 15°C for the outer tube. Key findings include a 7.69% increase in friction factor for 1% Al2O3/H2O compared to pure water and a 16% increase compared to the Gnielinski correlation at a Reynolds number of 2500. The Nusselt number (Nu) exhibited a 98.42% increase compared to the Gnielinski correlation at a Reynolds number of 5500 and a 39% increase compared to pure water at the same Reynolds number. Heat transfer coefficients (hi) were found to increase by 9.52% compared to pure water and 12% compared to the correlation in existing literature.

show abstract

“…Bahmani h et al [1] investigated the Nu and f for water/alumina nanofluid in a DTHx. The results demonstrate remarkable enhancements in Nu and friction coefficient, with maximum improvements of 32.7% and 30% in average Nu and PEC, respectively [2]. It investigated the Nanofluids and thread structures on the tubes to intensify heat transfer.…”

Section: Introductionmentioning

confidence: 99%

Improving Thermo-Hydraulic Performance with Varying Concentrations of Alumina Nanofluids: A Numerical Investigation

Rajitha,

Habelalmateen

et al. 2024

E3S Web of Conf.

View full text Add to dashboard Cite

In the current study, the investigation of heat transfer and fluid flow Characteristics of Pure water when pass through a double tube heat exchanger (DTHX). This investigation has been conducted across various Reynolds Number to gain insights into their performance also conducted a computational fluid dynamics (CFD) simulation using the ANSYS-FLUENT 22 R1 software. The study employed mathematical models and thermophysical properties of nanofluids and water, which were sourced from existing literature. The analysis focused on comparing pure water, 1% Al2O3/H2O nanofluids. The investigation considered various operating variable as Reynolds Number and temperature across the inner, and outer tubes. Specifically, the Reynolds Number of a range of 2500 to 5500 at 80°C, and 2500 at 15°C for the respective tubes. Key findings are that friction factor for pure water, 1% alumina nf, 2% alumina nf, and 3% alumina nf is increased by 4.61%,11.42%,15.06% and 16.21% as compared to Gnielinski correlation in existing literature at a Reynolds Number of 2500 and this increase in friction factor is 5.66%, 13.79%, 18.03% and 19.61% respectively at Reynolds number of 5500. Nusselt number (Nu) for pure water, 1% alumina nf, 2% alumina nf, and 3% alumina nf is increased by 24.92%, 50.04%, 59.90% and 64.31% as compared to Gnielinski correlation in existing literature at a Reynolds Number of 2500 and this increase is 10.84%, 28.68%, 35.31% and 41.55% respectively at Reynolds number of 5500. The heat transfer coefficients (hi) for pure water, 1% alumina nf, 2% alumina nf, and 3% alumina nf is increased by 3.17%, 7.29%, 8.49% and 8.94% as compared to Gnielinski correlation in existing literature at a Reynolds Number of 2500 and this increase is 8.04%, 18.49%, 21.54% and 22.64% respectively at Reynolds number of 5500.

show abstract

Analysis of thermal efficiency of a corrugated double-tube heat exchanger with nanofluids

Cited by 23 publications

References 37 publications

Thermal performance investigation of N‐shape double‐pipe heat exchanger using Al₂O₃, TiO₂, and Fe₃O₄‐based nanofluids

Thermal performance investigation of N‐shape double‐pipe heat exchanger using Al₂O₃, TiO₂, and Fe₃O₄‐based nanofluids

Enhancement of Thermo-Hydraulic Performance using Water-Based Alumina Nanofluids: A Numerical Investigation

Improving Thermo-Hydraulic Performance with Varying Concentrations of Alumina Nanofluids: A Numerical Investigation

Contact Info

Product

Resources

About

Analysis of thermal efficiency of a corrugated double-tube heat exchanger with nanofluids

Cited by 23 publications

References 37 publications

Thermal performance investigation of N‐shape double‐pipe heat exchanger using Al2O3, TiO2, and Fe3O4‐based nanofluids

Thermal performance investigation of N‐shape double‐pipe heat exchanger using Al2O3, TiO2, and Fe3O4‐based nanofluids

Enhancement of Thermo-Hydraulic Performance using Water-Based Alumina Nanofluids: A Numerical Investigation

Improving Thermo-Hydraulic Performance with Varying Concentrations of Alumina Nanofluids: A Numerical Investigation

Contact Info

Product

Resources

About

Thermal performance investigation of N‐shape double‐pipe heat exchanger using Al₂O₃, TiO₂, and Fe₃O₄‐based nanofluids

Thermal performance investigation of N‐shape double‐pipe heat exchanger using Al₂O₃, TiO₂, and Fe₃O₄‐based nanofluids