02477cas a2200241 a 450000500170000000800410001703500150005810000230007324500590009626000520015530000100020749000270021750001560024450200580040052014270045865000160188570000390190170000460194070000460198671000790203281000590211185600650217020260817172101.0110910s1985    th uu|m rtt   0|  a1eng d  a.b101267401 aMurugaboopathi, C.10aCalibration of sprinkler to simulate tropical rainfall  aBangkok :bAsian Institute of Technology,c1985  a78 p.1 aThesis ;vno. AE-85-06  aA thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Environment, Resources and Development  aThesis (M.Eng.) - Asian Institute of Technology, 1985  aThe study aims at calibrating sprinkler nozzles to simulate tropical rainfall with respect to rainfall characteristics such as intensity. distribution uniformity, dropsize distribution, kinetic energy and momentum. The "Rainjet 836c" square pattern sprinkler nozzle was selected for this purpose. One, two, three and four nozzle arrangements were used and the rainfall of different intensities was obtained by varying the gate valve pressure. The simulated rainfall was within the intensity range of 18.84mm/hr to 95.05mm/hr and the distribution uniformity was between 75.68 percent to 93.26 percent. The relationship between the drop mass and pellet mass was investigated using a drop forming apparatus and a "Mass Ration Curve" was developed, showing the relationship between pelletmass and massratio, the ration of the drop mass to pelletmass. The mass ratio curve was used to analyse the dropsize distribution of the simulated rainfall. Eight sets of measurements were made for the dropsize distribution and the results imply that the distribution of the drops follows the Gumbel distribution. The median volume drop diameter ranges between 1.69mm -2.15 mm. The kinetic energy and momentum of the simulated rainfall were also evaluated and momentum of the simulated rainfall were also evaluated and the values obtained are much higher than for actual rainfall because of the pressure and velocity energy in the nozzle. 0aRain-making1 aJensen, Jens Raunso, eChairperson1 aEppendorfer, W.H., eExamintion Committee1 aRahman, Md. Ataur, eExamintion Committee2 aCanadian International Development Agency, (CIDA-BBD), eScholarship Donor2 aAsian Institute of Technology.tThesis ;vno. AE-85-06  3Full-Textuhttp://203.159.5.9/ait-thesis/detail.php?q=B19917