Natural convection heat transfer performance of non-newtonian power-law fluids enclosed in cavity with complex-wavy surfaces

Ching Chang Cho, Chieh-Li Chen, Jenn Jiang Hwang, Cha'O Kuang Chen

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Numerical simulations are performed to investigate the natural convection heat transfer performance of non-Newtonian power-law fluids in a cavity bounded by wavy vertical walls with different temperatures and flat horizontal walls under adiabatic conditions. The results show that for Rayleigh numbers greater than 103, the mean Nusselt number has a significantly increase as the flow behavior index is decreased. Moreover, it is shown that in the convection-dominated regime, the mean Nusselt number increases with an increasing Rayleigh number, while in the conduction-dominated regime, the mean Nusselt number remains approximately constant. Finally, it is shown that for a given fluid, the heat transfer performance can be optimized via an appropriate tuning of the wavelength and amplitude of the wavy surface depending on the Rayleigh number.

Original languageEnglish
Article number014502
JournalJournal of Heat Transfer
Volume136
Issue number1
DOIs
Publication statusPublished - 2014 Jan 1

Fingerprint

Rayleigh number
Nusselt number
Natural convection
free convection
heat transfer
Heat transfer
cavities
Fluids
fluids
adiabatic conditions
convection
Tuning
tuning
conduction
Wavelength
Computer simulation
wavelengths
simulation
Temperature
temperature

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

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abstract = "Numerical simulations are performed to investigate the natural convection heat transfer performance of non-Newtonian power-law fluids in a cavity bounded by wavy vertical walls with different temperatures and flat horizontal walls under adiabatic conditions. The results show that for Rayleigh numbers greater than 103, the mean Nusselt number has a significantly increase as the flow behavior index is decreased. Moreover, it is shown that in the convection-dominated regime, the mean Nusselt number increases with an increasing Rayleigh number, while in the conduction-dominated regime, the mean Nusselt number remains approximately constant. Finally, it is shown that for a given fluid, the heat transfer performance can be optimized via an appropriate tuning of the wavelength and amplitude of the wavy surface depending on the Rayleigh number.",
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Natural convection heat transfer performance of non-newtonian power-law fluids enclosed in cavity with complex-wavy surfaces. / Cho, Ching Chang; Chen, Chieh-Li; Hwang, Jenn Jiang; Chen, Cha'O Kuang.

In: Journal of Heat Transfer, Vol. 136, No. 1, 014502, 01.01.2014.

Research output: Contribution to journalArticle

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