Effects of multiple trapezoidal vortex generators on flow and surface cooling

Jeongmoon Park, Jorge L. Alvarado, Leonardo Patricio Chamorro Chavez, Charles P. Marsh

Research output: Contribution to journalConference article

Abstract

Flow and heat transfer experiments have been conducted to study the effects of multiple trapezoidal vortex generators on flow structure and surface cooling. The resulting vortical structures and their surface cooling effects in the wake region of the VGs were studied using planar particle image velocimetry (PIV) and infrared (IR) thermography. PIV was used to determine the mean flow distribution and shear rate of flowing air near the wall, while IR thermography was used to measure surface temperature. Experiments were performed at a fixed Reynolds number of 4800 based on the hydraulic diameter of the duct. The width-to-spacing ratio (WTS) of the VGs have been varied to understand the role of the down-flow motion of the counter-rotating vortex pairs (CVPs) on local heat transfer enhancement. Experimental results reveal that a significant cooling effect is obtained when the induced flow by the CVP is accelerated in the streamwise direction within the boundary layer while the vortices are kept adjacent to the surface. Results to date also show that heat transfer enhancement can be correlated to the local shear rate measured near the wall (y+ < 5).

Original languageEnglish (US)
Pages (from-to)3005-3014
Number of pages10
JournalInternational Heat Transfer Conference
Volume2018-August
StatePublished - Jan 1 2018
Event16th International Heat Transfer Conference, IHTC 2018 - Beijing, China
Duration: Aug 10 2018Aug 15 2018

Fingerprint

surface cooling
vortex generators
Gas generators
Vortex flow
Cooling
heat transfer
vortices
particle image velocimetry
Heat transfer
Velocity measurement
Shear deformation
counters
shear
cooling
augmentation
Flow structure
ducts
wakes
hydraulics
Ducts

Keywords

  • Convective heat transfer
  • Counter-rotating vortex pair (CVP)
  • Shear stress
  • Vortex flows
  • Vortex generator
  • Vortex interactions

ASJC Scopus subject areas

  • Fluid Flow and Transfer Processes
  • Condensed Matter Physics
  • Mechanical Engineering

Cite this

Effects of multiple trapezoidal vortex generators on flow and surface cooling. / Park, Jeongmoon; Alvarado, Jorge L.; Chamorro Chavez, Leonardo Patricio; Marsh, Charles P.

In: International Heat Transfer Conference, Vol. 2018-August, 01.01.2018, p. 3005-3014.

Research output: Contribution to journalConference article

Park, Jeongmoon ; Alvarado, Jorge L. ; Chamorro Chavez, Leonardo Patricio ; Marsh, Charles P. / Effects of multiple trapezoidal vortex generators on flow and surface cooling. In: International Heat Transfer Conference. 2018 ; Vol. 2018-August. pp. 3005-3014.
@article{5da4d68a39f9406aab12c3c49b267dea,
title = "Effects of multiple trapezoidal vortex generators on flow and surface cooling",
abstract = "Flow and heat transfer experiments have been conducted to study the effects of multiple trapezoidal vortex generators on flow structure and surface cooling. The resulting vortical structures and their surface cooling effects in the wake region of the VGs were studied using planar particle image velocimetry (PIV) and infrared (IR) thermography. PIV was used to determine the mean flow distribution and shear rate of flowing air near the wall, while IR thermography was used to measure surface temperature. Experiments were performed at a fixed Reynolds number of 4800 based on the hydraulic diameter of the duct. The width-to-spacing ratio (WTS) of the VGs have been varied to understand the role of the down-flow motion of the counter-rotating vortex pairs (CVPs) on local heat transfer enhancement. Experimental results reveal that a significant cooling effect is obtained when the induced flow by the CVP is accelerated in the streamwise direction within the boundary layer while the vortices are kept adjacent to the surface. Results to date also show that heat transfer enhancement can be correlated to the local shear rate measured near the wall (y+ < 5).",
keywords = "Convective heat transfer, Counter-rotating vortex pair (CVP), Shear stress, Vortex flows, Vortex generator, Vortex interactions",
author = "Jeongmoon Park and Alvarado, {Jorge L.} and {Chamorro Chavez}, {Leonardo Patricio} and Marsh, {Charles P.}",
year = "2018",
month = "1",
day = "1",
language = "English (US)",
volume = "2018-August",
pages = "3005--3014",
journal = "International Heat Transfer Conference",
issn = "2377-424X",

}

TY - JOUR

T1 - Effects of multiple trapezoidal vortex generators on flow and surface cooling

AU - Park, Jeongmoon

AU - Alvarado, Jorge L.

AU - Chamorro Chavez, Leonardo Patricio

AU - Marsh, Charles P.

PY - 2018/1/1

Y1 - 2018/1/1

N2 - Flow and heat transfer experiments have been conducted to study the effects of multiple trapezoidal vortex generators on flow structure and surface cooling. The resulting vortical structures and their surface cooling effects in the wake region of the VGs were studied using planar particle image velocimetry (PIV) and infrared (IR) thermography. PIV was used to determine the mean flow distribution and shear rate of flowing air near the wall, while IR thermography was used to measure surface temperature. Experiments were performed at a fixed Reynolds number of 4800 based on the hydraulic diameter of the duct. The width-to-spacing ratio (WTS) of the VGs have been varied to understand the role of the down-flow motion of the counter-rotating vortex pairs (CVPs) on local heat transfer enhancement. Experimental results reveal that a significant cooling effect is obtained when the induced flow by the CVP is accelerated in the streamwise direction within the boundary layer while the vortices are kept adjacent to the surface. Results to date also show that heat transfer enhancement can be correlated to the local shear rate measured near the wall (y+ < 5).

AB - Flow and heat transfer experiments have been conducted to study the effects of multiple trapezoidal vortex generators on flow structure and surface cooling. The resulting vortical structures and their surface cooling effects in the wake region of the VGs were studied using planar particle image velocimetry (PIV) and infrared (IR) thermography. PIV was used to determine the mean flow distribution and shear rate of flowing air near the wall, while IR thermography was used to measure surface temperature. Experiments were performed at a fixed Reynolds number of 4800 based on the hydraulic diameter of the duct. The width-to-spacing ratio (WTS) of the VGs have been varied to understand the role of the down-flow motion of the counter-rotating vortex pairs (CVPs) on local heat transfer enhancement. Experimental results reveal that a significant cooling effect is obtained when the induced flow by the CVP is accelerated in the streamwise direction within the boundary layer while the vortices are kept adjacent to the surface. Results to date also show that heat transfer enhancement can be correlated to the local shear rate measured near the wall (y+ < 5).

KW - Convective heat transfer

KW - Counter-rotating vortex pair (CVP)

KW - Shear stress

KW - Vortex flows

KW - Vortex generator

KW - Vortex interactions

UR - http://www.scopus.com/inward/record.url?scp=85068338679&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85068338679&partnerID=8YFLogxK

M3 - Conference article

AN - SCOPUS:85068338679

VL - 2018-August

SP - 3005

EP - 3014

JO - International Heat Transfer Conference

JF - International Heat Transfer Conference

SN - 2377-424X

ER -