Fulljet başlık kullanılarak bazı formüllerle hesaplanan kinetik enerjilerin karşılaştırılması üzerine bir çalışma

Amaç: Farklı basınçlarda Fulljet tipi başlık (½ HH-50 WSQ) kullanılarak Rose (referans) formülü ile farklı formüllerle hesaplanan kinetik enerjilerin karşılaştırılması amaçlanmıştır. Materyal ve Yöntem: %9 eğimli 1x1 m boyutunda platform üzerine 17 adet kap (250 cm3) yerleştirilmiştir. Daha sonra bu kaplara 5 dakika sürede yapay yağışlar (30, 40, 50, 60 ve 70 kPa basınçlarda), ½ HH-50 WSQ başlık ile 3 tekrarlı olarak uygulanmıştır. Damla çapı, yağış şiddetleri, terminal hızlar belirlenmiş ve kinetik enerjiler farklı eşitliklerle hesaplanmıştır. Araştırma Bulguları: Bu çalışmada yağış şiddetleri, 85-109 mm h-1, Christiansen katsayıları (CU) (%) %83-87, damla çapları (D50) 1.77-2.05 mm ve terminal hızlar 6.08-6.67 m s-1 belirlenmiştir. Ortalama kinetik enerjiler de sırasıyla 9.94-46.59 J m-2 mm-1 arasında hesaplanmıştır. Sonuç: Bu çalışmada, Rose (1960) formülü ile bazı kinetik enerji formülleri arasında çok yakın (%±5) ilişkiler bulunmuştur.

Anahtar Kelimeler:

Christiansen katsayısı, kinetik enerji., ortalama damla çapı, Yağış şiddeti, terminal hız

A study on the comparison of kinetic energies calculated with some formulas using Fulljet nozzle

Objective: The objective of this study was to compare kinetic energies calculated by different formulas with Rose’s (reference) formula, using Fulljet type nozzle (½ HH-50 WSQ) at different pressures. Material and Methods: A platform in the dimension of 1x1 m was used to place 17 cups (250 cm3) and inclined at a slope of 9%. Then, artificial rainfalls (at pressures of 30, 40, 50, 60 and 70 kPa) was applied with a ½ HH-50 WSQ nozzle for 5 minutes and each experiment was triplicated. Drop diameter, rainfall intensities, terminal velocities were determined and kinetic energies were calculated with different equations. Results: In this study, it was found that rain intensities varied between 85- and 109 mm h-1, Christiansen coefficients (CU) (%) were 83-87 %, drop diameter (D50) were 1.77-2.05 mm, and terminal velocities were 6.08-6.67 m s-1. Average kinetic energies were also calculated between 9.94-46.59 J m-2 mm-1, respectively. Conclusions: The results obtained from this study (±5 %) were found to be in good agreement with the Rose (1960) formula and some kinetic energy formulas.

Keywords:

Christiansen coefficients, kinetic energy., mean drop diameter, Rain intensity, terminal velocity,

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