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| Main Authors: | , |
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| Format: | Preprint |
| Published: |
2024
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2410.07162 |
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Table of Contents:
- Conventional methods for measuring the local convective heat transfer coefficient (h_c) often rely on simplifying assumptions that can compromise accuracy. Pump-probe methods like time-domain thermoreflectance (TDTR) avoid these assumptions but are limited to h_c values larger than 30 kW/(m^2-K) due to modulation frequency constraints. This study introduces an optical-based Square-Pulsed Source (SPS) method, expanding the frequency range from 10 MHz to 1 Hz, enabling measurements of h_c values above 100 W/(m^2-K) with uncertainties under 10%. The efficacy of the SPS method is demonstrated through measurements of local h_c in an impingement heat transfer process with a single round gas jet. The local Nusselt number distribution is compared with existing literature correlations, offering insights into convective heat transfer phenomena. This study presents a novel tool for measuring local intrinsic convective heat transfer coefficients, enhancing the understanding of local convective heat transfer.