Elliptical double corrugated tubes for enhanced heat transfer

Kristina Navickaitė*, Luca Cattani, Christian R.H. Bahl, Kurt Engelbrecht

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

The thermal performance at constant pumping power conditions was numerically investigated in ellipse and super ellipse-based double corrugated tubes. A significant increase in thermal efficiency in double corrugated tubes is accompanied with a reasonable penalty in flow reduction for the cases modelled. An ellipse and a super ellipse-based double corrugated tubes were modelled at laminar fully hydraulically developed incompressible flow. Each base geometry was analysed holding either hydraulic diameter constant or the cross-sectional area constant. The pressure drop was normalized to the length of each modelled tube in order to maintain the pumping power. Thermal analysis was conducted under constant wall temperature boundary condition. The governing equations for non-isothermal flow were solved using the finite element method, and the results of the simulations were normalized to an equivalent straight tube. Numerical results predict a thermal efficiency enhanced by 400% maintaining 4.2 times lower volumetric flow rate in double corrugated tubes at the same pressure drop. The global performance evaluation criterion increases up to 14% for the double corrugated tubes with an ellipse-base and up to 11% for the tubes with super ellipse-base.
Original languageEnglish
JournalInternational Journal of Heat and Mass Transfer
Volume128
Pages (from-to)363-377
ISSN0017-9310
DOIs
Publication statusPublished - 2018

Keywords

  • Heat transfer enhancement
  • Pressure drop
  • Numerical simulation
  • Corrugated tube
  • Performance evaluation criteria

Cite this

@article{46b97650bd87415db7cccef0a29a402d,
title = "Elliptical double corrugated tubes for enhanced heat transfer",
abstract = "The thermal performance at constant pumping power conditions was numerically investigated in ellipse and super ellipse-based double corrugated tubes. A significant increase in thermal efficiency in double corrugated tubes is accompanied with a reasonable penalty in flow reduction for the cases modelled. An ellipse and a super ellipse-based double corrugated tubes were modelled at laminar fully hydraulically developed incompressible flow. Each base geometry was analysed holding either hydraulic diameter constant or the cross-sectional area constant. The pressure drop was normalized to the length of each modelled tube in order to maintain the pumping power. Thermal analysis was conducted under constant wall temperature boundary condition. The governing equations for non-isothermal flow were solved using the finite element method, and the results of the simulations were normalized to an equivalent straight tube. Numerical results predict a thermal efficiency enhanced by 400{\%} maintaining 4.2 times lower volumetric flow rate in double corrugated tubes at the same pressure drop. The global performance evaluation criterion increases up to 14{\%} for the double corrugated tubes with an ellipse-base and up to 11{\%} for the tubes with super ellipse-base.",
keywords = "Heat transfer enhancement, Pressure drop, Numerical simulation, Corrugated tube, Performance evaluation criteria",
author = "Kristina Navickaitė and Luca Cattani and Bahl, {Christian R.H.} and Kurt Engelbrecht",
year = "2018",
doi = "10.1016/j.ijheatmasstransfer.2018.09.003",
language = "English",
volume = "128",
pages = "363--377",
journal = "International Journal of Heat and Mass Transfer",
issn = "0017-9310",
publisher = "Pergamon Press",

}

Elliptical double corrugated tubes for enhanced heat transfer. / Navickaitė, Kristina; Cattani, Luca; Bahl, Christian R.H.; Engelbrecht, Kurt.

In: International Journal of Heat and Mass Transfer, Vol. 128, 2018, p. 363-377.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Elliptical double corrugated tubes for enhanced heat transfer

AU - Navickaitė, Kristina

AU - Cattani, Luca

AU - Bahl, Christian R.H.

AU - Engelbrecht, Kurt

PY - 2018

Y1 - 2018

N2 - The thermal performance at constant pumping power conditions was numerically investigated in ellipse and super ellipse-based double corrugated tubes. A significant increase in thermal efficiency in double corrugated tubes is accompanied with a reasonable penalty in flow reduction for the cases modelled. An ellipse and a super ellipse-based double corrugated tubes were modelled at laminar fully hydraulically developed incompressible flow. Each base geometry was analysed holding either hydraulic diameter constant or the cross-sectional area constant. The pressure drop was normalized to the length of each modelled tube in order to maintain the pumping power. Thermal analysis was conducted under constant wall temperature boundary condition. The governing equations for non-isothermal flow were solved using the finite element method, and the results of the simulations were normalized to an equivalent straight tube. Numerical results predict a thermal efficiency enhanced by 400% maintaining 4.2 times lower volumetric flow rate in double corrugated tubes at the same pressure drop. The global performance evaluation criterion increases up to 14% for the double corrugated tubes with an ellipse-base and up to 11% for the tubes with super ellipse-base.

AB - The thermal performance at constant pumping power conditions was numerically investigated in ellipse and super ellipse-based double corrugated tubes. A significant increase in thermal efficiency in double corrugated tubes is accompanied with a reasonable penalty in flow reduction for the cases modelled. An ellipse and a super ellipse-based double corrugated tubes were modelled at laminar fully hydraulically developed incompressible flow. Each base geometry was analysed holding either hydraulic diameter constant or the cross-sectional area constant. The pressure drop was normalized to the length of each modelled tube in order to maintain the pumping power. Thermal analysis was conducted under constant wall temperature boundary condition. The governing equations for non-isothermal flow were solved using the finite element method, and the results of the simulations were normalized to an equivalent straight tube. Numerical results predict a thermal efficiency enhanced by 400% maintaining 4.2 times lower volumetric flow rate in double corrugated tubes at the same pressure drop. The global performance evaluation criterion increases up to 14% for the double corrugated tubes with an ellipse-base and up to 11% for the tubes with super ellipse-base.

KW - Heat transfer enhancement

KW - Pressure drop

KW - Numerical simulation

KW - Corrugated tube

KW - Performance evaluation criteria

U2 - 10.1016/j.ijheatmasstransfer.2018.09.003

DO - 10.1016/j.ijheatmasstransfer.2018.09.003

M3 - Journal article

VL - 128

SP - 363

EP - 377

JO - International Journal of Heat and Mass Transfer

JF - International Journal of Heat and Mass Transfer

SN - 0017-9310

ER -