and make an educated choice that best suits the application in Q - labyrinth flow rate in litres per hour Let us look at how these dripper. elements impact the Turbulence Coefficient and thereby the quality of a anti‐root intrusion and anti‐siphon devices are unique to a specific dripper and they are not question. anti‐root intrusion and anti‐siphon devices are unique to a specific dripper and they are not question. dripper. Letofus at how these elements impact the Turbulence The depth and width thelook labyrinth: the greater, the better. measurable. Let us look at how these elements impact the Turbulence The depth and width of the labyrinth: the greater, the better. measurable. The concept simply involves two aspects: the dripper’s net Coefficient and thereby the quality of a dripper. At 10 m pressure, the flow rate is 1.0 litre perof hour a labyrinth with 44 teeth and width x The concept simply involves two aspects: the dripper’s net Coefficient and thereby the quality a44through dripper. At 10 m pressure, the flow rate is 1.0 litre per hour through a labyrinth with teeth and width x filtration area and its Turbulence Coefficient. depth dimensions of 0.60mm x 0.59mm. The resulting Turbulence Coefficient is 7.2. filtration area and its Turbulence Coefficient. depth dimensions of 0.60mm x 0.59mm. The resulting Turbulence Coefficient is 7.2. Figure 1. The filter at the inlet to a modern boat‐shaped non‐PC dripper 254 ∗ 10 ∗ (𝟎𝟎𝟎𝟎. 𝟔𝟔𝟔𝟔𝟎𝟎𝟎𝟎 ∗ 𝟎𝟎𝟎𝟎. 𝟓𝟓𝟓𝟓𝟓𝟓𝟓𝟓)² Figure 1. The filter at the inlet to a modern boat‐shaped non‐PC dripper Let us look at how these elements impact the Turbulence Coefficient and thereby the quality of a
𝐾𝐾𝐾𝐾 =
254 ∗ 10 ∗ (𝟎𝟎𝟎𝟎. 𝟔𝟔𝟔𝟔𝟎𝟎𝟎𝟎 ∗ 𝐾𝐾𝐾𝐾 𝟎𝟎𝟎𝟎. = 𝟓𝟓𝟓𝟓𝟓𝟓𝟓𝟓)² 44 ∗ 1.0²
44 ∗ 1.0²
𝐾𝐾𝐾𝐾 = 7.2 𝐾𝐾𝐾𝐾 = 7.2 However, increasing the labyrinth depth and width by 0.01mm to 0.61mm x 0.60mm but keeping all However, increasing the labyrinth depth and width by 0.01mm to 0.61mm x 0.60mm but keeping all other measurements the same, the Turbulence Coefficient would increase to 7.7 other measurements the same, the Turbulence Coefficient would increase to 7.7 254 ∗ 10 ∗ (𝟎𝟎𝟎𝟎. 𝟔𝟔𝟔𝟔𝟔𝟔𝟔𝟔 ∗ 𝟎𝟎𝟎𝟎. 𝟔𝟔𝟔𝟔𝟎𝟎𝟎𝟎)² 254 ∗ 10 ∗ (𝟎𝟎𝟎𝟎. 𝟔𝟔𝟔𝟔𝟔𝟔𝟔𝟔 ∗ 𝐾𝐾𝐾𝐾 𝟎𝟎𝟎𝟎. = 𝟔𝟔𝟔𝟔𝟎𝟎𝟎𝟎)² 𝐾𝐾𝐾𝐾 = 44 ∗ 1.0² 44 ∗ 1.0² 𝐾𝐾𝐾𝐾 = 7.7 𝐾𝐾𝐾𝐾 = 7.7
NETAFIM TALKS:
Figure 2.dripper The labyrinth of aa hole non-PC dripper Figure filter atboat-shaped the inlet to anon-PC moderndripper boat-shaped non-PC dripper Figure 2. The labyrinth ofFigure 2. The labyrinth non-PC withwhere the exit ‘bath’ to the left, where a hole Figure 1. The filter at the inlet to a modern boat‐shaped non‐PC dripper Figure 1. The filter at the inlet1.toThe a modern a non-PC with of thea exit ‘bath’dripper to the left, Figure 1. The filter at the inlet to a modern boat‐shaped non‐PC dripper Figure 2. The labyrinth of a non‐PC dripper with the exit ‘bath’ to the left, where a hole w Figure 2. The labyrinth of a non‐PC dripper with the exit ‘bath’ to the left, where a hole would be be madewall through the dripperline for the droplet to exit the irrigation system would be made through would the dripperline for the droplet to exitwall the irrigation system Figure 1. The filter at the inlet to a with the exit ‘bath’ to the left, where the made through the dripperline wall for the droplet to exit the irrigation system made through the dripperline wall for the droplet to exit the irrigation system
modern boat-shaped non-PC dripper
Dripper Comparison
droplet exits the irrigation system.
devices are unique specific drippers A farmer and his crop care not about Coefficient, the lower the dripper’s and are not measurable. the specifics and technical details of sensitivity to clogging and the better a dripper. It is what comes out of the its ability to maintain a constant flow A method has now been devised Figure 2. The labyrinth of a non‐PC dripper with the exit ‘bath’ to the left, where a hole would be Figure 2. The labyrinth of a non‐PC dripper with the exit ‘bath’ to the left, where a hole would be dripper that they care about. They rate. This is achieved by the vortexes made through the dripperline wall for the droplet to exit the irrigation system made through the dripperline wall for the droplet to exit the irrigation system to quantify the common features, need a dripped supply of water into that develop in the labyrinth and formulate a score to evaluate quality, the wetted bulb-shaped root zone on create a self cleaning stream and make an educated choice that demand during the life of the crop. which purges contaminants best suits the application in question. This dripped supply may not vary or out of the dripper. The concept involves two aspects: decrease over time. It must be accurate the dripper’s net filtration area The higher the Turbulence Coefficient, and constant over the crop’s life. and its Turbulence Coefficient. the better the quality. To work out the We know in reality, that there is a vast Turbulence Coefficient, simply follow The Turbulence Coefficient difference in drippers and specifically the formula below: dripper quality. A good quality dripper A dripper’s structural features can 254 x P x (W x D) may be defined as one that emits K= be defined as an inlet filter, an inlet N x Q2 a predetermined flow rate that is orifice, a flow path whose shape is accurate and constant. a labyrinth with teeth, an exit ‘bath’ K – Turbulence Coefficient and finally an orifice that is made P–P ressure differential through Features that contribute to keeping through the wall of the drip line from a dripper clean and working are the labyrinth in metres which the droplet leaves the irrigation essentially those that contribute to the W–W idth of labyrinth water system and goes into the root zone. dripper’s quality. The main structural passage in mm features, such as the filtration area, With the exception of the inlet filter, D–D epth of labyrinth water the labyrinth depth, width, and length, the Turbulence Coefficient embraces passage in mm are common to all drippers and are all of the structural features of the N – Number of teeth in the labyrinth all measurable. Other features, such dripper and contributes to its quality. In essence, the higher the Turbulence as anti-root intrusion and anti-siphon Q–L abyrinth flow rate in litres per hour
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THINK TANK | April 2021
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