Heat Transfer Performance and Flow Characteristics of a Heat Exchange Tube with Isosceles Trapezoidal Winglet Longitudinal Vortex Generators
The thermal-hydraulic performance of circular heat transfer tubes equipped with isosceles trapezoidal winglet longitudinal vortex generators (ITWL-VGs) was investigated through integrated experimental and numerical approaches. Experimental studies were conducted that focused on the effects of key pa...
Saved in:
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-03-01
|
| Series: | Energies |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1996-1073/18/7/1717 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | The thermal-hydraulic performance of circular heat transfer tubes equipped with isosceles trapezoidal winglet longitudinal vortex generators (ITWL-VGs) was investigated through integrated experimental and numerical approaches. Experimental studies were conducted that focused on the effects of key parameters: (1) the ITW quantity (<i>n</i> = 4, 6, 8); (2) the attack angle (α = 0°, 15°, 30°, 45°); and (3) four distinct VG arrangements. Numerical simulations employing multi-physical field analysis elucidated the underlying heat transfer enhancement mechanisms. The numerical simulations demonstrated excellent agreement with the experimental measurements. The results indicated that uniformly distributed ITWL-VGs with suitable angles of attack (α) significantly enhanced the thermal performance. Increasing the number of ITWs (<i>N</i>) generated additional longitudinal vortices, intensifying fluid mixing and heat transfer enhancement, thereby improving the <i>PEC</i> value. All the Nusselt number (<i>Nu</i>), friction factor (<i>f</i>) and <i>PEC</i> values exhibited positive correlations with the <i>α</i> and the spacing (<i>L<sub>P</sub></i>), respectively. Within the scope of this study, the <i>α</i> should not be less than 30°. In addition, an optimal value should be used for the <i>L<sub>P</sub></i>. The maximum <i>PEC</i> value was 1.27. These findings conclusively demonstrated the significant heat transfer enhancement capabilities of ITWL-VGs. |
|---|---|
| ISSN: | 1996-1073 |