Effects of rib arrangements and rotation speed on heat transfer in a two-pass duct

Hyung Hee Cho, Yun Young Kim, Kyung Min Kim, Dong Ho Rhee

Research output: Contribution to conferencePaper

21 Citations (Scopus)

Abstract

The present study investigates heat/mass transfer characteristics in a rotating two-pass duct for smooth and ribbed surfaces. The duct has an aspect ratio (W/H of 1:2) of 0.5 and a hydraulic diameter (A) of 26.67 mm. 70°-angled rib tabulators are attached on the leading and trailing sides of the duct in parallel and cross arrangements. The pitch-to-rib height ratio (p/e) is 7.5 and the rib height-to-hydraulic diameter ratio (e/D h ) is 0.075. The Reynolds number based on the hydraulic diameter is constant at 10, 000 and the rotation number ranges from 0.0 to 0.2. Detailed local heat/mass transfer coefficients are measured using a naphthalene sublimation technique, which is analogous to the two-side heating condition of heat transfer experiment. The results show that the secondary flows generated by the 180°-turn, rib tabulators, and duct rotation affect the wall heat/mass transfer distribution significantly. The curvature of the 180°-turn produces Dean vortices causing high heat/mass transfer in the turning region and in the upstream region of the second-pass. When the duct is roughened with ribs, the disturbed main flow produces recirculation and secondary flows near the ribbed surfaces. Consequently, the heat/mass transfer is enhanced two to three times more. As the duct rotates, the rotation-induced Coriolis force deflects the main flow and results in differences on the heat/mass transfer distribution between the leading and trailing surfaces. Its effects become more dominant as the rotation number increases. Discussions are presented describing how the rib configuration and the rotation speed affect the flow patterns and local heat/mass transfer in the duct.

Original languageEnglish
Pages433-442
Number of pages10
DOIs
Publication statusPublished - 2003 Dec 1
Event2003 ASME Turbo Expo - Atlanta, GA, United States
Duration: 2003 Jun 162003 Jun 19

Other

Other2003 ASME Turbo Expo
CountryUnited States
CityAtlanta, GA
Period03/6/1603/6/19

Fingerprint

Ducts
Mass transfer
Heat transfer
Secondary flow
Hydraulics
Coriolis force
Sublimation
Naphthalene
Hot Temperature
Flow patterns
Aspect ratio
Vortex flow
Reynolds number
Heating
Experiments

All Science Journal Classification (ASJC) codes

  • Engineering(all)

Cite this

Cho, H. H., Kim, Y. Y., Kim, K. M., & Rhee, D. H. (2003). Effects of rib arrangements and rotation speed on heat transfer in a two-pass duct. 433-442. Paper presented at 2003 ASME Turbo Expo, Atlanta, GA, United States. https://doi.org/10.1115/GT2003-38609
Cho, Hyung Hee ; Kim, Yun Young ; Kim, Kyung Min ; Rhee, Dong Ho. / Effects of rib arrangements and rotation speed on heat transfer in a two-pass duct. Paper presented at 2003 ASME Turbo Expo, Atlanta, GA, United States.10 p.
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Cho, HH, Kim, YY, Kim, KM & Rhee, DH 2003, 'Effects of rib arrangements and rotation speed on heat transfer in a two-pass duct' Paper presented at 2003 ASME Turbo Expo, Atlanta, GA, United States, 03/6/16 - 03/6/19, pp. 433-442. https://doi.org/10.1115/GT2003-38609

Effects of rib arrangements and rotation speed on heat transfer in a two-pass duct. / Cho, Hyung Hee; Kim, Yun Young; Kim, Kyung Min; Rhee, Dong Ho.

2003. 433-442 Paper presented at 2003 ASME Turbo Expo, Atlanta, GA, United States.

Research output: Contribution to conferencePaper

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AU - Cho, Hyung Hee

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AU - Kim, Kyung Min

AU - Rhee, Dong Ho

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Y1 - 2003/12/1

N2 - The present study investigates heat/mass transfer characteristics in a rotating two-pass duct for smooth and ribbed surfaces. The duct has an aspect ratio (W/H of 1:2) of 0.5 and a hydraulic diameter (A) of 26.67 mm. 70°-angled rib tabulators are attached on the leading and trailing sides of the duct in parallel and cross arrangements. The pitch-to-rib height ratio (p/e) is 7.5 and the rib height-to-hydraulic diameter ratio (e/D h ) is 0.075. The Reynolds number based on the hydraulic diameter is constant at 10, 000 and the rotation number ranges from 0.0 to 0.2. Detailed local heat/mass transfer coefficients are measured using a naphthalene sublimation technique, which is analogous to the two-side heating condition of heat transfer experiment. The results show that the secondary flows generated by the 180°-turn, rib tabulators, and duct rotation affect the wall heat/mass transfer distribution significantly. The curvature of the 180°-turn produces Dean vortices causing high heat/mass transfer in the turning region and in the upstream region of the second-pass. When the duct is roughened with ribs, the disturbed main flow produces recirculation and secondary flows near the ribbed surfaces. Consequently, the heat/mass transfer is enhanced two to three times more. As the duct rotates, the rotation-induced Coriolis force deflects the main flow and results in differences on the heat/mass transfer distribution between the leading and trailing surfaces. Its effects become more dominant as the rotation number increases. Discussions are presented describing how the rib configuration and the rotation speed affect the flow patterns and local heat/mass transfer in the duct.

AB - The present study investigates heat/mass transfer characteristics in a rotating two-pass duct for smooth and ribbed surfaces. The duct has an aspect ratio (W/H of 1:2) of 0.5 and a hydraulic diameter (A) of 26.67 mm. 70°-angled rib tabulators are attached on the leading and trailing sides of the duct in parallel and cross arrangements. The pitch-to-rib height ratio (p/e) is 7.5 and the rib height-to-hydraulic diameter ratio (e/D h ) is 0.075. The Reynolds number based on the hydraulic diameter is constant at 10, 000 and the rotation number ranges from 0.0 to 0.2. Detailed local heat/mass transfer coefficients are measured using a naphthalene sublimation technique, which is analogous to the two-side heating condition of heat transfer experiment. The results show that the secondary flows generated by the 180°-turn, rib tabulators, and duct rotation affect the wall heat/mass transfer distribution significantly. The curvature of the 180°-turn produces Dean vortices causing high heat/mass transfer in the turning region and in the upstream region of the second-pass. When the duct is roughened with ribs, the disturbed main flow produces recirculation and secondary flows near the ribbed surfaces. Consequently, the heat/mass transfer is enhanced two to three times more. As the duct rotates, the rotation-induced Coriolis force deflects the main flow and results in differences on the heat/mass transfer distribution between the leading and trailing surfaces. Its effects become more dominant as the rotation number increases. Discussions are presented describing how the rib configuration and the rotation speed affect the flow patterns and local heat/mass transfer in the duct.

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Cho HH, Kim YY, Kim KM, Rhee DH. Effects of rib arrangements and rotation speed on heat transfer in a two-pass duct. 2003. Paper presented at 2003 ASME Turbo Expo, Atlanta, GA, United States. https://doi.org/10.1115/GT2003-38609