Experimental investigation of heat transfer enhancement on the endwall around an obstacle embedded with a vortex generator pair
(2018) 16th International Heat Transfer Conference, IHTC 2018 In International Heat Transfer Conference p.4971-4978- Abstract
Heat transfer enhancement on the endwall around an obstacle embedded with a pair of vortex generators is investigated. Obstacles with cylindrical and square cross sections are experimentally examined and compared with and without vortex generators. The vortex generators employed is a pair of longitudinal winglet vortex generator. Local Nusselt numbers are calculated for both types of obstacles in presence of vortex generator experimentally whereas, flow features are captured numerically using ANSYS-FLUENT 17.0. A high heat transfer region upstream of the obstacle has increased its width with the installation of vortex generators for both shapes of the obstacle. However, only a small increase in magnitude occurs. Comparison of local... (More)
Heat transfer enhancement on the endwall around an obstacle embedded with a pair of vortex generators is investigated. Obstacles with cylindrical and square cross sections are experimentally examined and compared with and without vortex generators. The vortex generators employed is a pair of longitudinal winglet vortex generator. Local Nusselt numbers are calculated for both types of obstacles in presence of vortex generator experimentally whereas, flow features are captured numerically using ANSYS-FLUENT 17.0. A high heat transfer region upstream of the obstacle has increased its width with the installation of vortex generators for both shapes of the obstacle. However, only a small increase in magnitude occurs. Comparison of local Nusselt numbers shows that for the case of the cylindrical obstacle, there is more heat transfer at the center of the obstacle whereas, for the obstacle with square cross section, more heat transfer is observed at the upstream corners of the obstacle both with and without vortex generators. It is also evident from the findings of the results that installation of vortex generators upstream of an obstacle enhances the endwall heat transfer more in the spanwise direction than the streamwise direction. In addition, flow characteristics obtained from the numerical simulations show that presence of a vortex generator pair reinforces the strength of the horseshoe vortex and as a result additional heat transfer enhancement. Thermal performance for both types of obstacles in presence of vortex generators are calculated and compared at various Reynolds number.
(Less)
- author
- Hussain, Safeer LU ; Liu, Jian LU ; Wang, Lei LU and Sundén, Bengt LU
- organization
- publishing date
- 2018
- type
- Chapter in Book/Report/Conference proceeding
- publication status
- published
- subject
- keywords
- Heat transfer coefficient, Obstacle, Vortex generator
- host publication
- Proceeding: International Heat Transfer Conference 16
- series title
- International Heat Transfer Conference
- pages
- 8 pages
- publisher
- Begell House
- conference name
- 16th International Heat Transfer Conference, IHTC 2018
- conference location
- Beijing, China
- conference dates
- 2018-08-10 - 2018-08-15
- external identifiers
-
- scopus:85068335483
- ISSN
- 2377-424X
- DOI
- 10.1615/IHTC16.hte.022151
- language
- English
- LU publication?
- yes
- id
- 37dd4c29-d80f-4440-ba7f-ecbdb2fb0d00
- date added to LUP
- 2019-07-11 15:06:32
- date last changed
- 2023-09-09 11:12:01
@inproceedings{37dd4c29-d80f-4440-ba7f-ecbdb2fb0d00,
abstract = {{<p>Heat transfer enhancement on the endwall around an obstacle embedded with a pair of vortex generators is investigated. Obstacles with cylindrical and square cross sections are experimentally examined and compared with and without vortex generators. The vortex generators employed is a pair of longitudinal winglet vortex generator. Local Nusselt numbers are calculated for both types of obstacles in presence of vortex generator experimentally whereas, flow features are captured numerically using ANSYS-FLUENT 17.0. A high heat transfer region upstream of the obstacle has increased its width with the installation of vortex generators for both shapes of the obstacle. However, only a small increase in magnitude occurs. Comparison of local Nusselt numbers shows that for the case of the cylindrical obstacle, there is more heat transfer at the center of the obstacle whereas, for the obstacle with square cross section, more heat transfer is observed at the upstream corners of the obstacle both with and without vortex generators. It is also evident from the findings of the results that installation of vortex generators upstream of an obstacle enhances the endwall heat transfer more in the spanwise direction than the streamwise direction. In addition, flow characteristics obtained from the numerical simulations show that presence of a vortex generator pair reinforces the strength of the horseshoe vortex and as a result additional heat transfer enhancement. Thermal performance for both types of obstacles in presence of vortex generators are calculated and compared at various Reynolds number.</p>}},
author = {{Hussain, Safeer and Liu, Jian and Wang, Lei and Sundén, Bengt}},
booktitle = {{Proceeding: International Heat Transfer Conference 16}},
issn = {{2377-424X}},
keywords = {{Heat transfer coefficient; Obstacle; Vortex generator}},
language = {{eng}},
pages = {{4971--4978}},
publisher = {{Begell House}},
series = {{International Heat Transfer Conference}},
title = {{Experimental investigation of heat transfer enhancement on the endwall around an obstacle embedded with a vortex generator pair}},
url = {{http://dx.doi.org/10.1615/IHTC16.hte.022151}},
doi = {{10.1615/IHTC16.hte.022151}},
year = {{2018}},
}