| Author | Ganapathy, S. |
| Call Number | AIT Thesis no. AE-89-11 |
| Subject(s) | Spraying equipment
|
| Note | A thesis submitted in partial fulfilment of the requirements for
the degree of Master of Engineering, School of Environment, Resources and Development |
| Publisher | Asian Institute of Technology |
| Abstract | A high voltage circuit of an output of 15-20 kV for an input
supplied from a wet battery of 6 V was designed using the locally
available materials. A prototype electro-static sprayer for oil
based liquids was developed using the charging circuit designed.
The charging circuit consists of an astable multivibrator, an
inverter with a single stepup center tap transformer and a
multiplier. The multiplier consists of 16 stages of cascaded
halfwave double , the cascades rated for 1000 V. The sprayer
prototype has a back pack unit containing the battery and
charging circuit. The spray handle houses the multiplier unit and
supports the spray tank at its other end . Direct charging method
is adopted in the design of the electro-static sprayer.
Preliminary testing of the sprayer with malathion in kerosene
produced droplets of size 10-250 µm . Contact charging studies
were conducted for Electrodyn, Experimental Electrodyn and a
spinning disc sprayer. Effect of voltage, flowrate and viscosity
on the droplet spectrum were analysed. In electrodyn sprayer,
the effect of metal nozzle was compared to that of plastic
nozzle . An attempt was made to measure the charge carried by the
spray by designing a Faraday cage and associated circuitries. |
| Year | 1989 |
| Type | Thesis |
| School | School of Environment, Resources, and Development |
| Department | Department of Food, Agriculture and Natural Resources (Former title: Department of Food Agriculture, and BioResources (DFAB)) |
| Academic Program/FoS | Agricultural and Food Engineering (AE) |
| Chairperson(s) | Singh, Gajendra
; |
| Examination Committee(s) | Gupta, Chandra P. ;Gee-Clough, D. ;Salokhe, Vilas M. ; |
| Scholarship Donor(s) | Royal Norwegian Government; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1989 |