Passive heat transfer enhancement in 3D corrugated tube

Kristina Navickaité, Kurt Engelbrecht, Christian Bahl

Research output: Contribution to conferencePaperResearchpeer-review

Abstract

An innovative hydraulic design was studied for corrugated tube geometry for a heat exchanger. An ellipse based double corrugation was used as a concept of the geometry. The hydraulic diameter (Dh) is maintained over the tube
length while the shape of the cross section varies continuously along the flow direction. 38 corrugated tubes with a Dh of 5 mm were studied numerically with corrugation heights from 0.23 to 0.69 mm and corrugation periods from 5 to 50 mm
for laminar flow with water. Computational fluid dynamics (CFD) is used as a tool to study the effect of corrugation geometry on heat transfer and fluid flow with a constant wall temperature and total pressure drop. The governing equations
for these problems were solved using the Finite Element Method. The results of numerical modelling show significant increase in NTU for double corrugated tubes compared to a circular tube. The friction factor increases with increasing of
severity index, which represents the degree of tube roughness.
Original languageEnglish
Publication date2017
Number of pages10
Publication statusPublished - 2017
Event9th World Conference on Experimental Heat Transfer, Fluid Mechanics and Thermodynamics (ExHFT-9 2017) - Iguazu Falls, Brazil
Duration: 11 Jun 201715 Jun 2017
Conference number: 9
http://exhft9.org/

Conference

Conference9th World Conference on Experimental Heat Transfer, Fluid Mechanics and Thermodynamics (ExHFT-9 2017)
Number9
CountryBrazil
CityIguazu Falls
Period11/06/201715/06/2017
Internet address

Keywords

  • Heat transfer enhancement
  • Pressure drop
  • Numerical simulation
  • 3D corrugated tube

Cite this

Navickaité, K., Engelbrecht, K., & Bahl, C. (2017). Passive heat transfer enhancement in 3D corrugated tube. Paper presented at 9th World Conference on Experimental Heat Transfer, Fluid Mechanics and Thermodynamics (ExHFT-9 2017), Iguazu Falls, Brazil.
Navickaité, Kristina ; Engelbrecht, Kurt ; Bahl, Christian. / Passive heat transfer enhancement in 3D corrugated tube. Paper presented at 9th World Conference on Experimental Heat Transfer, Fluid Mechanics and Thermodynamics (ExHFT-9 2017), Iguazu Falls, Brazil.10 p.
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title = "Passive heat transfer enhancement in 3D corrugated tube",
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Navickaité, K, Engelbrecht, K & Bahl, C 2017, 'Passive heat transfer enhancement in 3D corrugated tube' Paper presented at 9th World Conference on Experimental Heat Transfer, Fluid Mechanics and Thermodynamics (ExHFT-9 2017), Iguazu Falls, Brazil, 11/06/2017 - 15/06/2017, .

Passive heat transfer enhancement in 3D corrugated tube. / Navickaité, Kristina; Engelbrecht, Kurt; Bahl, Christian.

2017. Paper presented at 9th World Conference on Experimental Heat Transfer, Fluid Mechanics and Thermodynamics (ExHFT-9 2017), Iguazu Falls, Brazil.

Research output: Contribution to conferencePaperResearchpeer-review

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T1 - Passive heat transfer enhancement in 3D corrugated tube

AU - Navickaité, Kristina

AU - Engelbrecht, Kurt

AU - Bahl, Christian

PY - 2017

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AB - An innovative hydraulic design was studied for corrugated tube geometry for a heat exchanger. An ellipse based double corrugation was used as a concept of the geometry. The hydraulic diameter (Dh) is maintained over the tubelength while the shape of the cross section varies continuously along the flow direction. 38 corrugated tubes with a Dh of 5 mm were studied numerically with corrugation heights from 0.23 to 0.69 mm and corrugation periods from 5 to 50 mmfor laminar flow with water. Computational fluid dynamics (CFD) is used as a tool to study the effect of corrugation geometry on heat transfer and fluid flow with a constant wall temperature and total pressure drop. The governing equationsfor these problems were solved using the Finite Element Method. The results of numerical modelling show significant increase in NTU for double corrugated tubes compared to a circular tube. The friction factor increases with increasing ofseverity index, which represents the degree of tube roughness.

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KW - Pressure drop

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Navickaité K, Engelbrecht K, Bahl C. Passive heat transfer enhancement in 3D corrugated tube. 2017. Paper presented at 9th World Conference on Experimental Heat Transfer, Fluid Mechanics and Thermodynamics (ExHFT-9 2017), Iguazu Falls, Brazil.