Open Access System for Information Sharing

Login Library

 

Article
Cited 34 time in webofscience Cited 41 time in scopus
Metadata Downloads

Two-phase measurements of wind and saltating sand in an atmospheric boundary layer SCIE SCOPUS

Title
Two-phase measurements of wind and saltating sand in an atmospheric boundary layer
Authors
Zhang, WWang, YLee, SJ
Date Issued
2007-07-15
Publisher
ELSEVIER SCIENCE BV
Abstract
Wind-blown sand movement is a particle-laden two-phase flow related to wind erosion in which the velocity distributions of both wind and sand are of particular interest. In the present study, two types of natural sand, one collected from the Pohang beach (diameter d=200-300 mu m) in South Korea and the other from the Taklimakan desert (d= 100-125 mu m) in China, were tested in a simulated atmospheric boundary layer. A high-speed digital camera system was used to capture images of the saltating sand particles at 2000 fps with an exposure time of 1/3000 s. Instantaneous velocity fields of the saltating sand particles were obtained using a particle tracking velocimetry (PTV) method. From these data, the particle resultant velocity, volume concentration, and streamwise mass flux were estimated as a function of height. The results reveal that the resultant particle velocity has an approximate log-linear profile with vertical height. Both the particle concentration and streamwise mass flux decay dramatically in the near surface region (z < 20 turn for the beach sand, and z < 15 mm for the desert sand), then decline mildly beyond this region. To investigate the modification of the surrounding wind by the saltating sand particles, a hot-wire anemometry with a robust hot-film probe was employed to measure the wind velocity profiles with and without saltation. The present experimental data on both the saltating sand and wind provide useful information that enhances our understanding of saltation transport and further development of control techniques of wind erosion. (C) 2006 Elsevier B.V All rights reserved.
Keywords
wind erosion; ABL; two-phase flow; PTV; velocity field; VELOCITY PROFILE; TUNNEL; TRANSPORT; PARTICLES; GRAINS; FLOW
URI
https://oasis.postech.ac.kr/handle/2014.oak/23029
DOI
10.1016/j.geomorph.2006.10.017
ISSN
0169-555X
Article Type
Article
Citation
GEOMORPHOLOGY, vol. 88, no. 1-2, page. 109 - 119, 2007-07-15
Files in This Item:
There are no files associated with this item.

qr_code

  • mendeley

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

Related Researcher

Researcher

이상준LEE, SANG JOON
Dept of Mechanical Enginrg
Read more

Views & Downloads

Browse