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Title: LDV measurements of the velocity field within a ribbed internal duct flow

Abstract

Laser Doppler velocimetry (LDV) has been used to measure the velocity field in an internal duct flow of air with regular rib roughness. The experiments were conducted to study the effect regular wall obstacles have on the flow velocity field. The instantaneous u and v velocities were measured in both a smooth and rough rectangular duct. For the smooth channel the wind tunnel Reynolds number capability was first investigated and was shown to be linear with blower shaft frequency, having a range of 13,000--42,000. Next, the turbulent velocity profiles were measured in the smooth channel for 6 different blower speeds (Reynolds numbers), and the results greatly resembled those found in previous literature. Twenty sets of rectangular, 6.35 mm x 6.35 mm ribs were then mounted to the top and bottom of the channel with a spacing of 75 mm (P/H = 11.8). A grid of nodes were selected and the turbulent velocities were measured for a given Reynolds number, and are presented and discussed. Valuable insight was gained which will aid in future studies intended to measure the Reynolds stress and other closure terms.

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
Univ. of California, Los Angeles, CA (US)
Sponsoring Org.:
USDOE
OSTI Identifier:
20002431
Report Number(s):
CONF-990805-
TRN: IM200002%%431
DOE Contract Number:  
FG03-89ER14033
Resource Type:
Conference
Resource Relation:
Conference: 33rd National Heat Transfer Conference NHTC'99, Albuquerque, NM (US), 08/15/1999--08/17/1999; Other Information: PBD: 1999; Related Information: In: Proceedings of the 33rd national heat transfer conference NHTC'99, by Jensen, M.K.; Di Marzo, M. [eds.], [1150] pages.
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; TURBULENCE; AUGMENTATION; HEAT TRANSFER; DUCTS; DESIGN; VELOCITY; AIR FLOW; LASER DOPPLER ANEMOMETERS

Citation Formats

Huckle, E, Pantelic, D, Hu, K, Jones, S, Travkin, V, and Catton, I. LDV measurements of the velocity field within a ribbed internal duct flow. United States: N. p., 1999. Web.
Huckle, E, Pantelic, D, Hu, K, Jones, S, Travkin, V, & Catton, I. LDV measurements of the velocity field within a ribbed internal duct flow. United States.
Huckle, E, Pantelic, D, Hu, K, Jones, S, Travkin, V, and Catton, I. Thu . "LDV measurements of the velocity field within a ribbed internal duct flow". United States.
@article{osti_20002431,
title = {LDV measurements of the velocity field within a ribbed internal duct flow},
author = {Huckle, E and Pantelic, D and Hu, K and Jones, S and Travkin, V and Catton, I},
abstractNote = {Laser Doppler velocimetry (LDV) has been used to measure the velocity field in an internal duct flow of air with regular rib roughness. The experiments were conducted to study the effect regular wall obstacles have on the flow velocity field. The instantaneous u and v velocities were measured in both a smooth and rough rectangular duct. For the smooth channel the wind tunnel Reynolds number capability was first investigated and was shown to be linear with blower shaft frequency, having a range of 13,000--42,000. Next, the turbulent velocity profiles were measured in the smooth channel for 6 different blower speeds (Reynolds numbers), and the results greatly resembled those found in previous literature. Twenty sets of rectangular, 6.35 mm x 6.35 mm ribs were then mounted to the top and bottom of the channel with a spacing of 75 mm (P/H = 11.8). A grid of nodes were selected and the turbulent velocities were measured for a given Reynolds number, and are presented and discussed. Valuable insight was gained which will aid in future studies intended to measure the Reynolds stress and other closure terms.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1999},
month = {7}
}

Conference:
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