New Zealand Journal of Agricultural Research abstracts
Numerical study on flow property in dentate path of drip emitters
Yan Dazhuang
Yang Peiling*
Ren Shumei
Li Yunkai
College of Water Conservancy and Civil Engineering
China Agricultural University
PO Box 57
Beijing City
100083, PR China
Xu Tingwu
International College at Beijing
China Agricultural University
Beijing City
100083, PR China
*Author for correspondence:
yandazhuang@126.com; yangpeiling@126.com.
Abstract The hydraulic property of drip
emitters is primarily
reflected in steady dissipation of pressure energy by flow resistance.
The dentate path helps in dissipating energy as water travels to the
emitter opening and maintains a turbulent flow condition that
facilitates movement of particulate material out of system to avoid
clogging. In this study, emitters were designed using variable
geometric parameters. The visualisation characteristics of
computational fluid dynamics (CFD) was utilised for analysing the law
of impact on flow movement by the path width (1.6, 1.3, 1.0,
0.6 mm), dentate height (1.0, 1.3, 1.6, 2.0 mm) and dentate
angle (32°, 41°, 53°, 63°) and revealed the correlation
relationship between the dentate structure of flow path of emitters and
energy dissipation. Meanwhile, an anti-clogging analysis was conducted.
The simulation results indicated that the selected turbulent model and
the numerical algorithm were suitable for the hydraulic calculation in
flow paths. The rear of dentations and dentate tips were the primary
regions for energy dissipation. The flow exponent with both dentate
height and path width being 1.3 mm was minimum and the boundary
flow velocity was maximum, i.e., there was good hydraulic performance
and sound anti-clogging capacity. Larger dentate angles had an active
role in enhancing hydraulic performance but with a poor anti-clogging
property. Adjusting dentate jet effect by modifying the boundary
structure of dentate flow paths could improve the inner flow pattern,
enhance pressure energy dissipation, and improve boundary flow
velocity, which was the key to enhancing hydraulic property and
anti-clogging property within flow path of emitters.
Keywords anti-clogging capacity; computational fluid dynamics
(CFD); dentate path; drip emitter; hydraulic performances
A07081; Online publication date 21 December 2007; Received and
accepted 10 August 2007
New Zealand Journal of Agricultural Research, 2007, Vol. 50:
705–712
0028–8233/07/5005–0705 © The Royal Society of New Zealand 2007
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