IMPACT OF MEASUREMENTS TECHNIQUES ON HEAT TRANSFER CHARACTERISTICS IN AIR JET ARRAYS

Authors

  • Assim Hameed Yousif Al Daraje Department of Mechanical Engineering, Philadelphia University, Amman, Jordon Author
  • Afrah Awad 2College of Oil and Gas Techniques Engineering - Kirkuk, Northern Technical University, Iraq Author https://orcid.org/0000-0003-3967-0821
  • Mohamed Gogazeh Department of Mechanical Engineering, Philadelphia University, Amman, Jordon Author
  • Hanan Afeef Mohammad Khamees Department of Mechanical Engineering, Philadelphia University, Amman, Jordon Author

DOI:

https://doi.org/10.31272/jeasd.28.1.2

Keywords:

Air Jet flow, Impingement cooling, Liquid crystal (TLC) technique, Local Nusselt number, Overall Nusselt number, IR cameras

Abstract

Air impact processes have diverse applications in engineering, including backflow welding, textile drying, and gas turbine blade and combustion liner cooling. This research examines the influence of experimental methodologies and measurement tools on convective heat transfer in adjustable air jet assemblies. The experiment involves the use of heated targets made of thin stainless steel foil with constant heat flux boundary conditions. Thermography measures target surface temperatures by analyzing how internal passage cross-flow affects convective heat transfer via outflow adjustments. The experiments involve two arrays of jet nozzles: inline and staggering, each comprising 44 impingement jet nozzles arranged in 4 rows with 11 jet holes in each row. The study presents unsteady time average local and spatial Nusselt numbers as functions of jet Reynolds number (4630-14000) and explores their dependence on the jet nozzle diameter. Cross-flow levels significantly affect spatial and local Nusselt numbers in both local and span-wise averaged values, regardless of the Reynolds number. Strong cross-flow (single configuration) distributes flow causing turbulence and uneven heat distribution, reducing Nusselt numbers. In contrast, moderate cross-flow (double configuration) improves heat transfer and increases Nusselt numbers. The study emphasizes the crucial role of experimental techniques in heat transfer evaluation and demonstrates agreement with prior studies within a standard error below 5%.

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Key Dates

Published

2024-01-01

Issue

Vol. 28 No. 1 (2024): Journal of Engineering and Sustainable Development

Section

Articles

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Copyright (c) 2023 Assim Hameed Yousif Al Daraje, Afrah Awad, Mohamed Gogazeh, Hanan Afeef Mohammad Khamees (Author)

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How to Cite

IMPACT OF MEASUREMENTS TECHNIQUES ON HEAT TRANSFER CHARACTERISTICS IN AIR JET ARRAYS. (2024). Journal of Engineering and Sustainable Development, 28(1), 17-34. https://doi.org/10.31272/jeasd.28.1.2

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