Systematic Comparison on Convective Heat Transfer Characteristics of Several Pin Fins for Turbine Cooling
This paper is focused on the heat transfer augment ability and friction factor of different cross-section pin fins. An experimental study is conducted in a wide rectangular channel. The steady-state thermochromic liquid crystals (TLC) method is applied to measure the tested surface temperature. Nine...
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MDPI AG
2021-08-01
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| Online Access: | https://www.mdpi.com/2073-4352/11/8/977 |
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| author | Jin Xu Ke Zhang Jingtian Duan Jiang Lei Junmei Wu |
| author_facet | Jin Xu Ke Zhang Jingtian Duan Jiang Lei Junmei Wu |
| author_sort | Jin Xu |
| collection | DOAJ |
| description | This paper is focused on the heat transfer augment ability and friction factor of different cross-section pin fins. An experimental study is conducted in a wide rectangular channel. The steady-state thermochromic liquid crystals (TLC) method is applied to measure the tested surface temperature. Nine sets of pin fins are employed in the experiment. The nominal diameter of all pin fins is the same value. Nine sets of pin fins have three roundness shapes (Circle, Ellipse and Oblong), three streamline shapes (Dropform, NACA and Lancet) and three quadrangle shapes (Diamond, Diamond-s and Square), respectively. The arrangement parameters of all nine shapes are kept the same. As they have the same nominal diameter and arrangement, the channel blockage ratio is the same for each pin fin set. Reynolds numbers range from 10,000 to 60,000. The pressure losses of pin fin arrays are measured to obtain friction factor. Meanwhile, the overall thermal performances of all nine sets are also considered and compared. The results show heat transfer enhancement abilities of quadrangle shape pin fins are relatively higher than the roundness and streamline shapes. Diamond-s pin fins present the largest averaged Nusselt number and overall thermal performance on the endwall for all the nine pin fins under different <i>Re</i>. Concerning overall thermal performance, the traditional Circle pin fin is the second best. The pressure loss of streamline shape pin fins is the lowest in these three shape types. Moreover, the characteristic of local heat transfer distribution varies substantially for different pin shapes at low <i>Re</i>. |
| first_indexed | 2024-03-10T08:53:13Z |
| format | Article |
| id | doaj.art-03fbefa7cc7246218e6e1fbfcb8bf97d |
| institution | Directory Open Access Journal |
| issn | 2073-4352 |
| language | English |
| last_indexed | 2024-03-10T08:53:13Z |
| publishDate | 2021-08-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Crystals |
| spelling | doaj.art-03fbefa7cc7246218e6e1fbfcb8bf97d2023-11-22T07:17:42ZengMDPI AGCrystals2073-43522021-08-0111897710.3390/cryst11080977Systematic Comparison on Convective Heat Transfer Characteristics of Several Pin Fins for Turbine CoolingJin Xu0Ke Zhang1Jingtian Duan2Jiang Lei3Junmei Wu4State Key Laboratory for Strength and Vibration of Mechanical Structures, School of Aerospace, Xi’an Jiaotong University, No.28, West Xianning Road, Xi'an 710049, ChinaState Key Laboratory for Strength and Vibration of Mechanical Structures, School of Aerospace, Xi’an Jiaotong University, No.28, West Xianning Road, Xi'an 710049, ChinaState Key Laboratory for Strength and Vibration of Mechanical Structures, School of Aerospace, Xi’an Jiaotong University, No.28, West Xianning Road, Xi'an 710049, ChinaState Key Laboratory for Strength and Vibration of Mechanical Structures, School of Aerospace, Xi’an Jiaotong University, No.28, West Xianning Road, Xi'an 710049, ChinaState Key Laboratory for Strength and Vibration of Mechanical Structures, School of Aerospace, Xi’an Jiaotong University, No.28, West Xianning Road, Xi'an 710049, ChinaThis paper is focused on the heat transfer augment ability and friction factor of different cross-section pin fins. An experimental study is conducted in a wide rectangular channel. The steady-state thermochromic liquid crystals (TLC) method is applied to measure the tested surface temperature. Nine sets of pin fins are employed in the experiment. The nominal diameter of all pin fins is the same value. Nine sets of pin fins have three roundness shapes (Circle, Ellipse and Oblong), three streamline shapes (Dropform, NACA and Lancet) and three quadrangle shapes (Diamond, Diamond-s and Square), respectively. The arrangement parameters of all nine shapes are kept the same. As they have the same nominal diameter and arrangement, the channel blockage ratio is the same for each pin fin set. Reynolds numbers range from 10,000 to 60,000. The pressure losses of pin fin arrays are measured to obtain friction factor. Meanwhile, the overall thermal performances of all nine sets are also considered and compared. The results show heat transfer enhancement abilities of quadrangle shape pin fins are relatively higher than the roundness and streamline shapes. Diamond-s pin fins present the largest averaged Nusselt number and overall thermal performance on the endwall for all the nine pin fins under different <i>Re</i>. Concerning overall thermal performance, the traditional Circle pin fin is the second best. The pressure loss of streamline shape pin fins is the lowest in these three shape types. Moreover, the characteristic of local heat transfer distribution varies substantially for different pin shapes at low <i>Re</i>.https://www.mdpi.com/2073-4352/11/8/977gas turbine coolingpin fin shapeheat transfer characteristicthermochromic liquid crystals |
| spellingShingle | Jin Xu Ke Zhang Jingtian Duan Jiang Lei Junmei Wu Systematic Comparison on Convective Heat Transfer Characteristics of Several Pin Fins for Turbine Cooling Crystals gas turbine cooling pin fin shape heat transfer characteristic thermochromic liquid crystals |
| title | Systematic Comparison on Convective Heat Transfer Characteristics of Several Pin Fins for Turbine Cooling |
| title_full | Systematic Comparison on Convective Heat Transfer Characteristics of Several Pin Fins for Turbine Cooling |
| title_fullStr | Systematic Comparison on Convective Heat Transfer Characteristics of Several Pin Fins for Turbine Cooling |
| title_full_unstemmed | Systematic Comparison on Convective Heat Transfer Characteristics of Several Pin Fins for Turbine Cooling |
| title_short | Systematic Comparison on Convective Heat Transfer Characteristics of Several Pin Fins for Turbine Cooling |
| title_sort | systematic comparison on convective heat transfer characteristics of several pin fins for turbine cooling |
| topic | gas turbine cooling pin fin shape heat transfer characteristic thermochromic liquid crystals |
| url | https://www.mdpi.com/2073-4352/11/8/977 |
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