Natural convection heat transfer enhancement of different nanofluids by adding dimple fins on a vertical channel wall

doi:10.1016/j.cjche.2019.11.001

中国化学工程学报 ›› 2020, Vol. 28 ›› Issue (3): 643-659.DOI: 10.1016/j.cjche.2019.11.001

• Fluid Dynamics and Transport Phenomena • 上一篇下一篇

Natural convection heat transfer enhancement of different nanofluids by adding dimple fins on a vertical channel wall

Milad Gholami¹, Mohammad Reza Nazari¹, Mohammad Hossien Talebi², Farzad Pourfattah³, Omid Ali Akbari⁴, Davood Toghraie⁵

1 Department of Mechanical Engineering, Yazd University, Yazd, Iran;
2 School of Mechanical Engineering, Science & Arts University, Yazd, Iran;
3 Mechanical Engineering Department University of Kashan, Kashan, Iran;
4 Young Researchers and Elite Club, Khomeinishahr Branch, Islamic Azad University, Khomeinishahr, Iran;
5 Department of Mechanical Engineering, Khomeinishahr Branch, Islamic Azad University, Khomeinishahr, Iran

收稿日期:2019-05-13 修回日期:2019-09-30 出版日期:2020-03-28 发布日期:2020-06-11
通讯作者: Davood Toghraie

Natural convection heat transfer enhancement of different nanofluids by adding dimple fins on a vertical channel wall

Milad Gholami¹, Mohammad Reza Nazari¹, Mohammad Hossien Talebi², Farzad Pourfattah³, Omid Ali Akbari⁴, Davood Toghraie⁵

1 Department of Mechanical Engineering, Yazd University, Yazd, Iran;
2 School of Mechanical Engineering, Science & Arts University, Yazd, Iran;
3 Mechanical Engineering Department University of Kashan, Kashan, Iran;
4 Young Researchers and Elite Club, Khomeinishahr Branch, Islamic Azad University, Khomeinishahr, Iran;
5 Department of Mechanical Engineering, Khomeinishahr Branch, Islamic Azad University, Khomeinishahr, Iran

Received:2019-05-13 Revised:2019-09-30 Online:2020-03-28 Published:2020-06-11
Contact: Davood Toghraie

摘要/Abstract

摘要： In this numerical study, natural flow and heat transfer of nanofluids with Al₂O₃, TiO₂, Cu and CNT nanoparticles in a vertical channel with dimpled fins at Rayleigh number (Ra) of Ra = 3.25×10⁷ to Ra = 1×10⁸ are investigated by using the finite volume method. The obtained results revealed that, using CNT in volume fractions of 2% and 4% leads to significant heat transfer and at φ = 6%, using TiO₂ nanoparticles has a great effect on Nu number enhancement. Also, using solid nanoparticles in base fluid causes more uniform heat transfer distribution, especially in areas close to heated surface and by adding more volume fraction in base fluid, temperature level reduces. In general, according to temperature contours, reduction of wall temperature depends on the increase of Ra and volume fraction and the type of solid nanoparticles.

关键词: Natural heat transfer, Dimpled fins, Rayleigh number, Nanofluid

Abstract: In this numerical study, natural flow and heat transfer of nanofluids with Al₂O₃, TiO₂, Cu and CNT nanoparticles in a vertical channel with dimpled fins at Rayleigh number (Ra) of Ra = 3.25×10⁷ to Ra = 1×10⁸ are investigated by using the finite volume method. The obtained results revealed that, using CNT in volume fractions of 2% and 4% leads to significant heat transfer and at φ = 6%, using TiO₂ nanoparticles has a great effect on Nu number enhancement. Also, using solid nanoparticles in base fluid causes more uniform heat transfer distribution, especially in areas close to heated surface and by adding more volume fraction in base fluid, temperature level reduces. In general, according to temperature contours, reduction of wall temperature depends on the increase of Ra and volume fraction and the type of solid nanoparticles.

Key words: Natural heat transfer, Dimpled fins, Rayleigh number, Nanofluid

Milad Gholami, Mohammad Reza Nazari, Mohammad Hossien Talebi, Farzad Pourfattah, Omid Ali Akbari, Davood Toghraie. Natural convection heat transfer enhancement of different nanofluids by adding dimple fins on a vertical channel wall[J]. 中国化学工程学报, 2020, 28(3): 643-659.

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Natural convection heat transfer enhancement of different nanofluids by adding dimple fins on a vertical channel wall

Natural convection heat transfer enhancement of different nanofluids by adding dimple fins on a vertical channel wall

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