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Interfacial friction factors for air-water co-current stratified flow in inclined channels

Abstract

The interfacial shear stress is experimentally investigated for co-current air-water stratified flow in inclined rectangular channels having a length of 1854mm, width of 120 mm and height of 40mm at almost atmospheric pressure. Experiments are carried out in several inclinations from 0 deg up to 10 deg. The local film thickness and the wave height are measured at three locations, i.e., L/H = 8,23, and 40. According to the inclination angle, the experimental data are categorized into two groups; nearly horizontal data group (0 deg {<=} {theta} {<=} 0.7 deg), and inclined channel data group (0.7 deg {<=} {theta} {<=} 10 deg ). Experimental observations for nearly horizontal data group show that the flow is not fully developed due to the water level gradient and the hydraulic jump within the channel. For the inclined channel data group, a dimensionless wave height, {Delta}h/h, is empirically correlated in terms of Re{sub G} and h/H. A modified root-mean-square wave height is proposed to consider the effects of the interfacial and wave propagation velocities. It is found that an equivalent roughness has a linear relationship with the modified root-mean-square wave height and its relationship is independent of the inclination. 10 refs., 6 figs., 1  More>>
Authors:
Choi, Ki Yong; No, Hee Cheon [1] 
  1. Korea Advanced Institute of Science and Technology, Taejon (Korea, Republic of)
Publication Date:
Dec 31, 1997
Product Type:
Miscellaneous
Report Number:
ETDE/KR-99732628; CONF-9710296-
Reference Number:
SCA: 420400; PA: KR-99:000305; EDB-99:037420; SN: 99002059932
Resource Relation:
Conference: Korean Nuclear Society autumn meeting, Taegu (Korea, Republic of), 24-25 Oct 1997; Other Information: PBD: 1997; Related Information: Is Part Of Proceedings of the korean nuclear society autumn meeting vol I, October 24-25, 1997 Taegu, Korea; PB: 797 p.
Subject:
42 ENGINEERING NOT INCLUDED IN OTHER CATEGORIES; FRICTION FACTOR; AIR; WATER; STRATIFICATION; FLUID FLOW; INCLINATION; SHEAR; RECTANGULAR CONFIGURATION; EXPERIMENTAL CHANNELS; EXPERIMENTAL DATA; INTERFACES
OSTI ID:
324140
Research Organizations:
Korean Nuclear Society, Taejon (Korea, Republic of)
Country of Origin:
Korea, Republic of
Language:
English
Other Identifying Numbers:
Other: ON: DE99732628; TRN: KR9900305
Availability:
OSTI as DE99732628
Submitting Site:
KR
Size:
pp. 481-486
Announcement Date:

Citation Formats

Choi, Ki Yong, and No, Hee Cheon. Interfacial friction factors for air-water co-current stratified flow in inclined channels. Korea, Republic of: N. p., 1997. Web.
Choi, Ki Yong, & No, Hee Cheon. Interfacial friction factors for air-water co-current stratified flow in inclined channels. Korea, Republic of.
Choi, Ki Yong, and No, Hee Cheon. 1997. "Interfacial friction factors for air-water co-current stratified flow in inclined channels." Korea, Republic of.
@misc{etde_324140,
title = {Interfacial friction factors for air-water co-current stratified flow in inclined channels}
author = {Choi, Ki Yong, and No, Hee Cheon}
abstractNote = {The interfacial shear stress is experimentally investigated for co-current air-water stratified flow in inclined rectangular channels having a length of 1854mm, width of 120 mm and height of 40mm at almost atmospheric pressure. Experiments are carried out in several inclinations from 0 deg up to 10 deg. The local film thickness and the wave height are measured at three locations, i.e., L/H = 8,23, and 40. According to the inclination angle, the experimental data are categorized into two groups; nearly horizontal data group (0 deg {<=} {theta} {<=} 0.7 deg), and inclined channel data group (0.7 deg {<=} {theta} {<=} 10 deg ). Experimental observations for nearly horizontal data group show that the flow is not fully developed due to the water level gradient and the hydraulic jump within the channel. For the inclined channel data group, a dimensionless wave height, {Delta}h/h, is empirically correlated in terms of Re{sub G} and h/H. A modified root-mean-square wave height is proposed to consider the effects of the interfacial and wave propagation velocities. It is found that an equivalent roughness has a linear relationship with the modified root-mean-square wave height and its relationship is independent of the inclination. 10 refs., 6 figs., 1 tab. (Author)}
place = {Korea, Republic of}
year = {1997}
month = {Dec}
}