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First Thermal and Fluids Engineering Summer Conference

ISSN: 2379-1748
ISBN: 978-1-56700-430-4

THE EFFECTS OF NOZZLE-TO-PLATE SPACING ON HEAT TRANSFER AND FLUID FLOW OF JET IMPINGEMENT

DOI: 10.1615/TFESC1.hte.013539
pages 1465-1471

Kyosung Choo
Youngstown State University, Youngstown, OH

Karen Schilling
Youngstown State University, Youngstown, OH 44555, USA

Brian K. Friedrich
Youngstown State University, Youngstown, OH 44555, USA


KEY WORDS: Heat Transfer, Impinging Jet, Impingement

Abstract

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.

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