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research-article

ANALYSIS OF TURBULENCE CHARACTERISTICS IN TWO LARGE CONCENTRIC ANNULAR DUCTS THROUGH PIV

[+] Author and Article Information
Marlon Mauricio Hernández Cely

Industrial Multiphase Flow Laboratory (LEMI), Mechanical Engineering Department, São Carlos School of Engineering, University of São Paulo (USP), Trabalhador São Carlense 400, 13566-570 São Carlos, SP, Brazil
marlonhc@usp.br

Victor Baptistella

Industrial Multiphase Flow Laboratory (LEMI), Mechanical Engineering Department, São Carlos School of Engineering, University of São Paulo (USP), Trabalhador São Carlense 400, 13566-570 São Carlos, SP, Brazil
victor.baptistella@usp.br

Oscar M.H. Rodriguez

Industrial Multiphase Flow Laboratory (LEMI), Mechanical Engineering Department, São Carlos School of Engineering, University of São Paulo (USP), Trabalhador São Carlense 400, 13566-570 São Carlos, SP, Brazil
oscarmhr@sc.usp.br

1Corresponding author.

ASME doi:10.1115/1.4041760 History: Received May 17, 2018; Revised October 16, 2018

Abstract

An experimental study is presented on water single-phase flow in two 10.5-m-long annular ducts, with external pipe's internal diameter (De) of 155 mm and two concentric internal pipes of external diameters (Di) of 60 mm and 125 mm, i.e., radius ratio (a = Ri/Re) of 0.39 and 0.80, respectively. Particle image velocimetry (PIV) was applied to obtain instantaneous and averaged velocity measurements of the flow field. A CCD camera (2448 pixel x 2050 pixel, 5 Mpixel,12-bit) recorded pairs of images of the seeding particles and a double pulsed PIV laser (Nd:YAG, frequency doubled to 532 nm), with a measured pulse intensity of 70 to 75 mJ/pulse, provided the illumination. Laminar flows were analyzed for validation purposes, experimental data on turbulent flows were compared with the classical la of the wall of the turbulent boundary-layer model and the shear stresses derived from PIV data were compared with those calculated from the measured pressure drop. Effects of the Reynolds number and geometry on turbulent velocity profiles and Reynolds stresses are presented. The results suggest that the law of the wall for annular-duct flow is a function of radius ratio. The new experimental results are of great value for the development of CFD models and more refined pressure-drop prediction tools in annular-duct flow.

Copyright (c) 2018 by ASME
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