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Title: Origin and decay of longitudinal vortices in developing flow in a curved rectangular duct

Abstract

Developing turbulent flow in a 90 deg curved duct of rectangular cross-section, and an aspect ratio of 6, was investigated. Mean-velocity and Reynolds-stress components were measured using a five-hole pressure problem and two-sensor hot-wire probes, respectively, in the boundary layers on the duct walls to document the pressure-driven secondary motion and the formation of a longitudinal vortex near the corner on the convex wall. Special attention was paid to the three-dimensionality of the flow exiting the two-dimensional contraction of the wind tunnel in order to provide proper inlet boundary conditions for future computational work. The mean velocities and wall shear stresses were measured at seven sections and turbulence measurement were made at four section. The data provide insights into the development of three-dimensional turbulent boundary layers under the influence of strong streamwise curvature, both convex or concave, and attendant pressure gradients, and clearly elucidate the mechanism by which strong pressure-driven secondary motion results in a longitudinal vortex.

Authors:
;  [1]
  1. (Univ. of Iowa, Iowa City, IA (United States). Dept. of Mechanical Engineering)
Publication Date:
OSTI Identifier:
7113840
Resource Type:
Journal Article
Journal Name:
Journal of Fluids Engineering; (United States)
Additional Journal Information:
Journal Volume: 116:1; Journal ID: ISSN 0098-2202
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; DUCTS; TURBULENT FLOW; VORTICES; C CODES; DYNAMICS; COMPUTER CODES; FLUID FLOW; MECHANICS; 420400* - Engineering- Heat Transfer & Fluid Flow

Citation Formats

Kim, W.J., and Patel, V.C. Origin and decay of longitudinal vortices in developing flow in a curved rectangular duct. United States: N. p., 1994. Web. doi:10.1115/1.2910240.
Kim, W.J., & Patel, V.C. Origin and decay of longitudinal vortices in developing flow in a curved rectangular duct. United States. doi:10.1115/1.2910240.
Kim, W.J., and Patel, V.C. Tue . "Origin and decay of longitudinal vortices in developing flow in a curved rectangular duct". United States. doi:10.1115/1.2910240.
@article{osti_7113840,
title = {Origin and decay of longitudinal vortices in developing flow in a curved rectangular duct},
author = {Kim, W.J. and Patel, V.C.},
abstractNote = {Developing turbulent flow in a 90 deg curved duct of rectangular cross-section, and an aspect ratio of 6, was investigated. Mean-velocity and Reynolds-stress components were measured using a five-hole pressure problem and two-sensor hot-wire probes, respectively, in the boundary layers on the duct walls to document the pressure-driven secondary motion and the formation of a longitudinal vortex near the corner on the convex wall. Special attention was paid to the three-dimensionality of the flow exiting the two-dimensional contraction of the wind tunnel in order to provide proper inlet boundary conditions for future computational work. The mean velocities and wall shear stresses were measured at seven sections and turbulence measurement were made at four section. The data provide insights into the development of three-dimensional turbulent boundary layers under the influence of strong streamwise curvature, both convex or concave, and attendant pressure gradients, and clearly elucidate the mechanism by which strong pressure-driven secondary motion results in a longitudinal vortex.},
doi = {10.1115/1.2910240},
journal = {Journal of Fluids Engineering; (United States)},
issn = {0098-2202},
number = ,
volume = 116:1,
place = {United States},
year = {1994},
month = {3}
}