Sub-Millimeter-Scale Measurement of Local Convective Heat Transfer Coefficient Exceeding 100 W/(m^2-K) Using an Optical Pump-Probe Method
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| Format: | Preprint |
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2024
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| _version_ | 1866916672352288768 |
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| author | Chen, Tao Jiang, Puqing |
| author_facet | Chen, Tao Jiang, Puqing |
| 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. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2410_07162 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Sub-Millimeter-Scale Measurement of Local Convective Heat Transfer Coefficient Exceeding 100 W/(m^2-K) Using an Optical Pump-Probe Method Chen, Tao Jiang, Puqing Applied Physics 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. |
| title | Sub-Millimeter-Scale Measurement of Local Convective Heat Transfer Coefficient Exceeding 100 W/(m^2-K) Using an Optical Pump-Probe Method |
| topic | Applied Physics |
| url | https://arxiv.org/abs/2410.07162 |