Heat transfer in wavy duct with different corrugation angle

Sang Dong Hwang, Han Ho Kim, Hyung Hee Cho, Seung Bae Chen

Research output: Contribution to journalConference article

Abstract

The present study investigates the effects of duct corrugation angle and flow velocity on the convective heat/mass transfer characteristics in wavy ducts applied in a primary surface heat exchanger. Local heat/mass transfer coefficients on the corrugated duct sidewall are determined using a naphthalene sublimation technique. The flow visualization technique is used to understand the overall flow structures inside the duct. The corrugation angles of the wavy ducts are 145° and 130°, and the duct aspect ratio is fixed at 7.3. The Reynolds numbers, based on the duct hydraulic diameter, vary from 1,000 to 5,000. The results show that secondary vortex flow cells, called Taylor-Görtler vortices, exist periodically in the wavy duct. Therefore, non-uniform distributions of the heat/mass transfer coefficients are obtained on the duct walls. On the pressure-side wall, high heat/mass transfer cell-shaped regions appear due to the secondary vortex flows for both corrugation angles. On the suction-side wall, the heat transfer coefficients are lower than those on the pressure-side wall. The wavy duct with the corrugation angle of 130° has the stronger strength of the secondary vortex cells resulting in higher heat/mass transfer rates on the duct wall because the sharp turn enhances the development of the secondary flow cells.

Original languageEnglish
Pages (from-to)63-70
Number of pages8
JournalAmerican Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD
Volume372
Issue number4
DOIs
Publication statusPublished - 2002 Dec 1
Event2002 ASME International Mechanical Engineering Congress and Exposition - New Orleans, LA, United States
Duration: 2002 Nov 172002 Nov 22

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Ducts
Heat transfer
Mass transfer
Vortex flow
Secondary flow
Sublimation
Flow structure
Flow visualization
Naphthalene
Flow velocity
Heat transfer coefficients
Heat exchangers
Aspect ratio
Reynolds number
Hydraulics
Hot Temperature

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering
  • Fluid Flow and Transfer Processes

Cite this

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title = "Heat transfer in wavy duct with different corrugation angle",
abstract = "The present study investigates the effects of duct corrugation angle and flow velocity on the convective heat/mass transfer characteristics in wavy ducts applied in a primary surface heat exchanger. Local heat/mass transfer coefficients on the corrugated duct sidewall are determined using a naphthalene sublimation technique. The flow visualization technique is used to understand the overall flow structures inside the duct. The corrugation angles of the wavy ducts are 145° and 130°, and the duct aspect ratio is fixed at 7.3. The Reynolds numbers, based on the duct hydraulic diameter, vary from 1,000 to 5,000. The results show that secondary vortex flow cells, called Taylor-G{\"o}rtler vortices, exist periodically in the wavy duct. Therefore, non-uniform distributions of the heat/mass transfer coefficients are obtained on the duct walls. On the pressure-side wall, high heat/mass transfer cell-shaped regions appear due to the secondary vortex flows for both corrugation angles. On the suction-side wall, the heat transfer coefficients are lower than those on the pressure-side wall. The wavy duct with the corrugation angle of 130° has the stronger strength of the secondary vortex cells resulting in higher heat/mass transfer rates on the duct wall because the sharp turn enhances the development of the secondary flow cells.",
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Heat transfer in wavy duct with different corrugation angle. / Hwang, Sang Dong; Kim, Han Ho; Cho, Hyung Hee; Chen, Seung Bae.

In: American Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD, Vol. 372, No. 4, 01.12.2002, p. 63-70.

Research output: Contribution to journalConference article

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