X hits on this document

PDF document

ARPN Journal of Engineering and Applied Sciences - page 2 / 9

37 views

0 shares

0 downloads

0 comments

2 / 9

VOL. 3, NO. 2, APRIL 2008

ISSN 1819-6608

ARPN Journal of Engineering and Applied Sciences

©2006-2008 Asian Research Publishing Network (ARPN). All rights reserved.

www.arpnj

ournals.com

derived by Al-Khatib (1989) and herein only the final

results are presented:

Q=

2 2 . 3 2 3 H g b C d 1

3

2 1

(1)

Where Q = volume rate of flow; Cd = characteristic discharge coefficient, b = bottom width of the control section; g = acceleration due to gravity; H1 = the total energy head at the head measurement-section.

In recent years long-throated flumes have become the measurement device of choice for most applications (Reclamation, 1997), superseding Parshall flumes and other traditional devices. These older devices were

laboratory-calibrated, because the flow through their control sections is curvilinear. In contrast, streamlines are essentially parallel in the control sections of long-throated

flumes, making them amenable to straightforward hydraulic theory.

analysis using

Significant advantages of long-throated flumes include (Wahl et al., 2000): Choice of throat shapes allows a wide range of discharges to be measured with good precision; Minimal head loss needed to maintain critical flow conditions in the throat of the flume; and E c o n o m i c a l c o n s t r u c t i o n a n d a d a p t a b i l i t y t o v a r y i n site conditions. g

Figure-1. Longitudinal Profile of a long-throated flume.

2.0 MATERIALS AND METHODS

Shahid Chamran University, Ahwaz, Iran. Figure-2 shows

2.1. Experimental setup

the plan view of the hydraulic laboratory and the flume which used in this research. Long-throated flumes were

In order to achieve the objective of this study a physical model is considered. Thus all series of experiments were conducted in a glass-walled horizontal flume 12.0 m long, 0.25 m wide and 0.50 m deep in the Hydraulic Laboratory at the Water and Science Collage of

manufactured from glass and placed at the distance of 2m from the upstream of the main flume system (the test section in Figure-2). In order to dissipating of the inflow energy, first flow passed through flow dissipater area, then traveled about 2 m to the test section.

63

Document info
Document views37
Page views37
Page last viewedFri Oct 28 15:52:13 UTC 2016
Pages9
Paragraphs439
Words3485

Comments