| Autor: |
Ansari, Sana, Dhruw, Laxmikant, Kothadia, Hardik B., R, Arun Kumar |
| Předmět: |
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| Zdroj: |
Heat & Mass Transfer; Jul2024, Vol. 60 Issue 7, p1267-1283, 17p |
| Abstrakt: |
The study focused on examining the area-averaged heat transfer characteristics of an air jet impinging on a concave surface. The experiments involved varying the Reynolds number (Re) within the range of 10,000 to 75,000, while adjusting the jet-to-plate distance from 3 to 20 times the jet diameter (d). The experimental setup included a jet with a diameter of 11.5 mm, and concave surfaces with curvature radii of 218 mm (Curvature ratio (Cr) = 0.026) and 281 mm (Cr = 0.021) were used. A detailed investigation was conducted using Infrared Thermography to measure the average Heat Transfer Coefficient (HTC) of jet impingement on these concave surfaces. The aim was to assess the impact of surface curvature on heat transfer at different locations from the impingement point. Additionally, the research compared the heat transfer effects in circular and square impingement regions that were identical in radial span and area ratios. It was observed that the area-averaged Nusselt number (Nu) generally increased with a higher Re and a lower jet-to-plate distance ratio (z/d). A maximum average Nu increase is observed for Cr = 0.026 when the mass flow rate is from 10,000 to 75,000. Increasing the curvature is an effective approach to provide localized cooling. A correlation comparison was also conducted, and a new empirical correlation has been proposed. This correlation works effectively across various ranges of Re, z/d, Cr, and radial position (r/d) with a deviation of less than ± 11%. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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