2010•설비공학논문집Requires access
1열 원형 서브머지드 충돌수분류군에 의한 열전달의 실험적 연구
엄기찬
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Abstract
An experimental investigation is presented to study the effect nozzle spacing, jet to plate spacing and Reynolds number on the local heat transfer to normally upward impinging submerged circular water jets on a flat heated surface. Nozzle arrays are a single jet(nozzle dia. = 8 ㎜), a row of 3 jets(nozzle dia. = 4.6 ㎜, nozzle spacing = 37.5 ㎜) and a row of 5 jets(nozzle dia. = 3.6 ㎜, nozzle spacing = 25 ㎜), and jet to plate spacing ranging from 16∼80 ㎜(H/D = 2∼10) is tested. Reynolds number based on single jet exit condition is varied 30000∼70000(V?= 3∼7 ㎧). Except for the condition of H/D = 10, the average Nusselt number of multi-jet is higher than that of single jet. For H/D = 2, average Nusselt number is increased by 50.3∼82.5% for a row of 3 jets and by 52.9∼65.2% on a row of 5 jets when compared to the average Nusselt number on the single jet.