Numerical analysis of spiral tube heat exchanger circulated with zinc oxide nanofluids

K. P. V. Krishna Varma; Kavati Venkateswarlu; Teku Kalyani; S. Hemalatha; P. Vijaya Kumar

doi:10.14744/thermal.0000921

Numerical analysis of spiral tube heat exchanger circulated with zinc oxide nanofluids

Abstract

Helical tube heat exchangers differ from ordinary heat exchangers in that they have special qualities that enhance heat transmission since the fluid flows from straight to coiled channels as curved streams instead of linear ones, leading to the increased momentum and heat transmission rates. However, there is still scope for research on improving heat transfer characteristics for a helical coil heat exchanger with conjugate heat transfer employing various configurations of internal longitudinal fins. Thus, in this work, numerical study was conducted to explore the flow behaviour and thermal performance of water-ZnO nanofluids (nanofluid) in a spiral tube heat exchanger. The mass flow rate (ṁ) of the water-ZnO nanofluids was varied from 0.025 kg/s to 0.125 kg/s, while the mass flow rate of the hot fluid (water) was maintained constant at 0.0091 kg/s. The concentrations of the nanofluid in water used were 1%, 2%, and 3%. Simulations in three dimensions were analysed for the turbulent stream regime, and governing equations for the turbulent stream were solved using the k-epsilon (k-ε) for Reynolds numbers ranging from 4000 to 12000. The temperature, velocity and pressure contours were analysed with respect to the variation in the concentration and flow rate of the ZnO nanofluids. Finally, the results confirmed that by applying ZnO nanofluids, the heat transfer coefficient as well as the friction factor increased by 43% and 1.12 times respectively when compared with the plain tube.

Keywords

References

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Details

Primary Language

English

Subjects

Fluid Mechanics and Thermal Engineering (Other)

Journal Section

Research Article

Authors

K. P. V. Krishna Varma This is me
0000-0002-2518-813X
India

Kavati Venkateswarlu ^* This is me
0000-0003-1197-5789
Namibia

Teku Kalyani This is me
0000-0002-3844-2483
India

S. Hemalatha This is me
0000-0002-9569-6922
India

P. Vijaya Kumar This is me
0000-0003-1555-6565
India

Publication Date

March 24, 2025

Submission Date

July 18, 2024

Acceptance Date

October 22, 2024

Published in Issue

Year 2025 Volume: 11 Number: 2

DOI

https://doi.org/10.14744/thermal.0000921

IZ

https://izlik.org/JA23AA44FS

Cite

RIS / Bibtex

APA

Varma, K. P. V. K., Venkateswarlu, K., Kalyani, T., Hemalatha, S., & Kumar, P. V. (2025). Numerical analysis of spiral tube heat exchanger circulated with zinc oxide nanofluids. Journal of Thermal Engineering, 11(2), 377-389. https://doi.org/10.14744/thermal.0000921

AMA

1.Varma KPVK, Venkateswarlu K, Kalyani T, Hemalatha S, Kumar PV. Numerical analysis of spiral tube heat exchanger circulated with zinc oxide nanofluids. Journal of Thermal Engineering. 2025;11(2):377-389. doi:10.14744/thermal.0000921

Chicago

Varma, K. P. V. Krishna, Kavati Venkateswarlu, Teku Kalyani, S. Hemalatha, and P. Vijaya Kumar. 2025. “Numerical Analysis of Spiral Tube Heat Exchanger Circulated With Zinc Oxide Nanofluids”. Journal of Thermal Engineering 11 (2): 377-89. https://doi.org/10.14744/thermal.0000921.

EndNote

Varma KPVK, Venkateswarlu K, Kalyani T, Hemalatha S, Kumar PV (March 1, 2025) Numerical analysis of spiral tube heat exchanger circulated with zinc oxide nanofluids. Journal of Thermal Engineering 11 2 377–389.

IEEE

[1]K. P. V. K. Varma, K. Venkateswarlu, T. Kalyani, S. Hemalatha, and P. V. Kumar, “Numerical analysis of spiral tube heat exchanger circulated with zinc oxide nanofluids”, Journal of Thermal Engineering, vol. 11, no. 2, pp. 377–389, Mar. 2025, doi: 10.14744/thermal.0000921.

ISNAD

Varma, K. P. V. Krishna - Venkateswarlu, Kavati - Kalyani, Teku - Hemalatha, S. - Kumar, P. Vijaya. “Numerical Analysis of Spiral Tube Heat Exchanger Circulated With Zinc Oxide Nanofluids”. Journal of Thermal Engineering 11/2 (March 1, 2025): 377-389. https://doi.org/10.14744/thermal.0000921.

JAMA

1.Varma KPVK, Venkateswarlu K, Kalyani T, Hemalatha S, Kumar PV. Numerical analysis of spiral tube heat exchanger circulated with zinc oxide nanofluids. Journal of Thermal Engineering. 2025;11:377–389.

MLA

Varma, K. P. V. Krishna, et al. “Numerical Analysis of Spiral Tube Heat Exchanger Circulated With Zinc Oxide Nanofluids”. Journal of Thermal Engineering, vol. 11, no. 2, Mar. 2025, pp. 377-89, doi:10.14744/thermal.0000921.

Vancouver

1.K. P. V. Krishna Varma, Kavati Venkateswarlu, Teku Kalyani, S. Hemalatha, P. Vijaya Kumar. Numerical analysis of spiral tube heat exchanger circulated with zinc oxide nanofluids. Journal of Thermal Engineering. 2025 Mar. 1;11(2):377-89. doi:10.14744/thermal.0000921