ISSN Online: 2379-1748
ISBN Flash Drive: 978-1-56700-431-1
ISBN Online: 978-1-56700-430-4
First Thermal and Fluids Engineering Summer Conference
THE EFFECTS OF NOZZLE-TO-PLATE SPACING ON HEAT TRANSFER AND FLUID FLOW OF JET IMPINGEMENT
要約
Heat transfer and fluid flow characteristics of a submerged jet impinging on a flat plate surface are
experimentally investigated. The working fluids are air and water. The effects of a wide range of nozzle-to-plate
spacing (H/d = 0.1 - 40) on the normalized stagnation Nusselt number and dimensionless stagnation
pressure are considered. The results show that the normalized stagnation Nusselt number and dimensionless
stagnation pressure are divided into three regions; Region I) jet deflection region (H/d ≤ 0.6), Region II)
potential core region (0.6 < H/d ≤ 7), and Region III) free jet region (7 < H/d ≤ 40). In region I, the normalized stagnation Nusselt number and dimensionless stagnation pressure drastically increase with decreasing the nozzle-to-plate spacing. In region II, the effect of the nozzle-to-plate spacing is negligible on
the normalized stagnation Nusselt number and dimensionless stagnation pressure. In region III, the normalized stagnation Nusselt number and dimensionless stagnation pressure monotonically decrease with increasing the nozzle-to-plate spacing. Based on the experimental results, new correlations for the normalized stagnation Nusselt number and dimensionless stagnation pressure of the impinging jet are developed as a function of the nozzle-to-plate spacing alone.