Abstract
Pin-fins have been used to enhance the heat transfer near the trailing edge of a turbine airfoil. Previous pin-fin heat transfer studies focused mainly on the array geometry of pin height-to-diameter equal to unity in a stationary frame. This study experimentally examines the effects of pin height-to-diameter ratio (Hp/Dp) from 2 to 4 and rotation number (Ro) from 0 to 0.2. The tested model used a staggered pin-fin array with an inter-pin spacing of 2.5 times the pin-diameter (S/D=2.5) in both longitudinal and transverse directions. Detailed heat/mass transfer coefficients were measured using the naphthalene sublimation technique with a heat-mass transfer analogy. The data measured suggest that an increase in Hp/Dp increases the level of array heat/mass transfer. Array averaged Sherwood numbers for Hp/Dp = 3 and Hp/Dp = 4 are approximately 10% and 35% higher than that of Hp/Dp = 2. The effect of rotation induces notable difference in heat/mass transfer between the leading surface and the trailing surface. The heat transfer coefficients change a little although the rotating number increases in the tested range because the pin-fins break the rotation-induced vortices.
| Original language | English |
|---|---|
| Title of host publication | 2008 Proceedings of the ASME Turbo Expo |
| Subtitle of host publication | Power for Land, Sea, and Air |
| Pages | 727-734 |
| Number of pages | 8 |
| Edition | PART A |
| DOIs | |
| Publication status | Published - 2008 Dec 1 |
| Event | 2008 ASME Turbo Expo - 2008 ASME Turbo Expo, Germany Duration: 2008 Jun 9 → 2008 Jun 13 |
Publication series
| Name | Proceedings of the ASME Turbo Expo |
|---|---|
| Number | PART A |
| Volume | 4 |
Other
| Other | 2008 ASME Turbo Expo |
|---|---|
| Country | Germany |
| City | 2008 ASME Turbo Expo |
| Period | 08/6/9 → 08/6/13 |
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All Science Journal Classification (ASJC) codes
- Engineering(all)
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Heat transfer on rotating channel with various heights of pin-fin. / Park, Jun Su; Kim, Kyung Min; Lee, Dong Hyun; Cho, Hyung Hee; Chyu, Minking K.
2008 Proceedings of the ASME Turbo Expo: Power for Land, Sea, and Air. PART A. ed. 2008. p. 727-734 (Proceedings of the ASME Turbo Expo; Vol. 4, No. PART A).Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
TY - GEN
T1 - Heat transfer on rotating channel with various heights of pin-fin
AU - Park, Jun Su
AU - Kim, Kyung Min
AU - Lee, Dong Hyun
AU - Cho, Hyung Hee
AU - Chyu, Minking K.
PY - 2008/12/1
Y1 - 2008/12/1
N2 - Pin-fins have been used to enhance the heat transfer near the trailing edge of a turbine airfoil. Previous pin-fin heat transfer studies focused mainly on the array geometry of pin height-to-diameter equal to unity in a stationary frame. This study experimentally examines the effects of pin height-to-diameter ratio (Hp/Dp) from 2 to 4 and rotation number (Ro) from 0 to 0.2. The tested model used a staggered pin-fin array with an inter-pin spacing of 2.5 times the pin-diameter (S/D=2.5) in both longitudinal and transverse directions. Detailed heat/mass transfer coefficients were measured using the naphthalene sublimation technique with a heat-mass transfer analogy. The data measured suggest that an increase in Hp/Dp increases the level of array heat/mass transfer. Array averaged Sherwood numbers for Hp/Dp = 3 and Hp/Dp = 4 are approximately 10% and 35% higher than that of Hp/Dp = 2. The effect of rotation induces notable difference in heat/mass transfer between the leading surface and the trailing surface. The heat transfer coefficients change a little although the rotating number increases in the tested range because the pin-fins break the rotation-induced vortices.
AB - Pin-fins have been used to enhance the heat transfer near the trailing edge of a turbine airfoil. Previous pin-fin heat transfer studies focused mainly on the array geometry of pin height-to-diameter equal to unity in a stationary frame. This study experimentally examines the effects of pin height-to-diameter ratio (Hp/Dp) from 2 to 4 and rotation number (Ro) from 0 to 0.2. The tested model used a staggered pin-fin array with an inter-pin spacing of 2.5 times the pin-diameter (S/D=2.5) in both longitudinal and transverse directions. Detailed heat/mass transfer coefficients were measured using the naphthalene sublimation technique with a heat-mass transfer analogy. The data measured suggest that an increase in Hp/Dp increases the level of array heat/mass transfer. Array averaged Sherwood numbers for Hp/Dp = 3 and Hp/Dp = 4 are approximately 10% and 35% higher than that of Hp/Dp = 2. The effect of rotation induces notable difference in heat/mass transfer between the leading surface and the trailing surface. The heat transfer coefficients change a little although the rotating number increases in the tested range because the pin-fins break the rotation-induced vortices.
UR - http://www.scopus.com/inward/record.url?scp=69949134557&partnerID=8YFLogxK
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U2 - 10.1115/GT2008-50783
DO - 10.1115/GT2008-50783
M3 - Conference contribution
AN - SCOPUS:69949134557
SN - 9780791843130
T3 - Proceedings of the ASME Turbo Expo
SP - 727
EP - 734
BT - 2008 Proceedings of the ASME Turbo Expo
ER -