Particle Image Velocimetry Flow Characterisation of High-Convection Slot Nozzle Systems for Impingement Heat Transfer

Eileen Trampe (), Ida Daube (), Dominik Büschgens, Herbert Pfeifer and Christian Wuppermann
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Eileen Trampe: Department for Industrial Furnaces and Heat Engineering, RWTH Aachen University, 52074 Aachen, Germany
Ida Daube: Department for Industrial Furnaces and Heat Engineering, RWTH Aachen University, 52074 Aachen, Germany
Dominik Büschgens: Department for Industrial Furnaces and Heat Engineering, RWTH Aachen University, 52074 Aachen, Germany
Herbert Pfeifer: Department for Industrial Furnaces and Heat Engineering, RWTH Aachen University, 52074 Aachen, Germany
Christian Wuppermann: Department for Industrial Furnaces and Heat Engineering, RWTH Aachen University, 52074 Aachen, Germany

Energies, 2025, vol. 18, issue 6, 1-15

Abstract: Impingement jets are used in many applications for high convective heat transfer. In order to optimise specialised nozzle systems, a comprehensive understanding of the gas flow is essential. The aim of this work is to investigate high-convective flows at Re = 10,000 to Re = 50,000 for a single slot nozzle (slot width W = 5 mm) and a slot nozzle array (distance between nozzle slots s = 70 mm) consisting of five nozzles. Particle image velocimetry measurements are taken for a distance between strip and nozzle exit of H = 50 mm and are compared to verify if the results from a single slot nozzle are transferable to a nozzle array. The presence of an array of nozzles not only creates a distinct zone where the individual jets interact but also changes the flow characteristics of the respective free jets. The potential core length in the nozzle field is significantly reduced compared to the single nozzle. It is therefore not possible to make a direct transfer of the results. Direct transferability of the results is therefore not possible. This means that further studies on whole arrays are needed to optimise nozzle arrays.

Keywords: impingement jets; convective heat transfer; thermal process technology; potential core length; turbulent flow; PIV visualisation; turbulent kinetic energy (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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