An Air assisted sprayer with electrostatic nozzle for coconut palms / (Record no. 19470)
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| 000 -LEADER | |
|---|---|
| fixed length control field | 03750nam a22001577a 4500 |
| 003 - CONTROL NUMBER IDENTIFIER | |
| control field | OSt |
| 082 ## - DEWEY DECIMAL CLASSIFICATION NUMBER | |
| Classification number | 631.3 |
| Item number | ATH/AN |
| 088 ## - REPORT NUMBER | |
| Report number | T 646 |
| 100 ## - MAIN ENTRY--AUTHOR NAME | |
| Personal name | Athira Prasad |
| 245 ## - TITLE STATEMENT | |
| Title | An Air assisted sprayer with electrostatic nozzle for coconut palms / |
| 260 ## - PUBLICATION, DISTRIBUTION, ETC. (IMPRINT) | |
| Place of publication | Tavanur : |
| Name of publisher | Department of Farm Machinery & Power Engineering, |
| Year of publication | 2025. |
| 300 ## - PHYSICAL DESCRIPTION | |
| Number of Pages | 147 p. |
| 520 ## - SUMMARY, ETC. | |
| Summary, etc | An air-assisted electrostatic sprayer prototype suitable for coconut palms<br/>was designed and developed. Studies on the important plant parameters, including<br/>height of palm, canopy diameter, and angle of leaf orientation, were carried out as<br/>the primary step in developing the prototype. The major components of the<br/>developed unit are a High Voltage DC (HVDC) System, nozzle unit, liquid delivery<br/>unit, and an air-assistance unit. The high-voltage DC system capable of generating<br/>voltages in the range of 1 to 10 kV was developed using a Line Output Transformer<br/>(LOPT 1010A) coupled with a Metal-OxideSemiconductor FieldEffect Transistor<br/>(MOSFETIRFZ44E). Among major electrostatic spray droplet charging methods,<br/>induction with a ring electrode (4.3 mm diameter copper wire) was chosen due to<br/>its several advantages over the other methods. The diameter of ring electrode (40,<br/>60, and 90 mm) and the horizontal position (5, 10, and 15 mm) of the electrode in<br/>front of the nozzle were optimized under laboratory conditions in terms of chargeto-mass ratio (CMR) of the developed electrostatic system using a specially<br/>designed Faraday Cage apparatus. A high-pressure hydraulic nozzle was selected<br/>for the liquid atomization and a double-stage diaphragm pump with a cut-off<br/>pressure of 10.5 kg‧cm2 was selected for the liquid supply unit. An Electric Ducted<br/>Fan (EDF) was chosen for the airassistance unit.<br/>The spray-gun comprising both the nozzle and the EDF was mounted on an<br/>8 m long telescopic carbon fiber pole, and all other major components and control<br/>units were arranged as a backpack unit for easy handling. Water Sensitive Papers<br/>(WSPs) were used to study the effect of electrostatic charging on spray<br/>characteristics. The performance evaluation of the developed prototype in terms of<br/>deposition, droplet density, spray drift and biological efficacy was carried out under<br/>actual field conditions and compared with a conventional sprayer (Rocker sprayer).<br/>The field trials were conducted under optimized operating conditions viz. electrode<br/>diameter (90 mm), electrode position (10 mm), operating pressure (5 kg‧cm2<br/>),<br/>VMD (156 μm), and EDF air flow velocity of 17 m‧s-1<br/>. The results concluded that<br/>the spray deposition of the developed sprayer has 20.69, 27.23, and 63.95 per cent<br/>higher in the adaxial surface at the lower, middle, and upper middle canopy<br/>respectively compared to the air-assisted spraying. And 39.05, 22.7, and 84.33 per<br/>cent higher with respect to the conventional rocker sprayer. Moreover, electrostatic<br/>spraying has 1.81 times more droplet density compared to rocker sprayer, and 1.2<br/>times more than the air-assisted sprayer. The deposition efficiency was calculated<br/>as 69.77, 43.09, and 33.86 per cent for the spraying with electrostatic sprayer, air<br/>assisted sprayer and rocker sprayer respectively. Spraying with the developed<br/>sprayer was able to reduce the Rugose Spiralling Whitefly (RSW) incidence,<br/>severity and RSW live colony per leaflets by 32.76, 64.17, and 74.91 per cent<br/>respectively. The total cost of the developed prototype was Rs. 22,120/- The<br/>operational cost of the developed electrostatic sprayer was calculated to be ₹151<br/>per hour, significantly lower than that of the conventional rocker sprayer, which<br/>stood at ₹231 per hour. |
| 700 ## - ADDED ENTRY--PERSONAL NAME | |
| Personal name | Dhalin, D (Guide) |
| 942 ## - ADDED ENTRY ELEMENTS (KOHA) | |
| Koha item type | Books |
| Collection code | Home library | Current library | Full call number | Accession Number | Koha item type | Public note |
|---|---|---|---|---|---|---|
| Reference | KAUAET | KAUAET | 631.3 ATH/AN | T 646 | Theses | PhD Thesis |