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Impingement Heat Transfer Within a Row of Submerged Circular Water Jets  

Ohm, Ki-Chan (Department of Machine Design, Inha Technical College)
Publication Information
Korean Journal of Air-Conditioning and Refrigeration Engineering / v.22, no.8, 2010 , pp. 538-544 More about this Journal
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 mm), a row of 3 jets(nozzle dia. = 4.6 mm, nozzle spacing = 37.5 mm) and a row of 5 jets(nozzle dia. = 3.6 mm, nozzle spacing = 25 mm), and jet to plate spacing ranging from 16∼80 mm(H/D = 2∼10) is tested. Reynolds number based on single jet exit condition is varied 30000∼70000($V_o$ = 3∼7 m/s). 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.
Keywords
Multi jet; Heat transfer; Submerged water jet; Nusselt number;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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