Transient Heat Transfer Characteristics of Round Jet Impacting on Inclined Concave Cylindrical Surface Based on Thermochromic Liquid Crystal
Transient Heat Transfer Characteristics of Round Jet Impacting on Inclined Concave Cylindrical Surface Based on Thermochromic Liquid Crystal
- Author(s): Liu Ming-yang and Chang Shi-nan
- DOI: 10.1049/cp.2018.0295
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- Author(s): Liu Ming-yang and Chang Shi-nan Source: CSAA/IET International Conference on Aircraft Utility Systems (AUS 2018), 2018 page (7 pp.)
- Conference: CSAA/IET International Conference on Aircraft Utility Systems (AUS 2018)
- DOI: 10.1049/cp.2018.0295
- ISBN: 978-1-78561-791-1
- Location: Guiyang, China
- Conference date: 19-22 June 2018
- Format: PDF
The transient heat transfer characteristics of a single circular hole jet impacting concave cylinder were obtained by thermochromic liquid crystal. In the study, the airflow Reynolds number Re, the impact distance to nozzle diameter ratio L/d and the jet impact angle α were changed. The color change process of the concave surface of the experimental part was photographed by the industrial camera. The local Nusselt number NuD distribution was calculated. The results show that the distribution of NuD for the initial phase of the jet impingement is bell type in a radial direction along the impact center. And with the impact process, the Nusselt number at the stagnation point Nus decreases gradually, where the maximum difference is 26.9%. When Re increases and L/d close to 4, the second peak is gradually obvious. As α increases, the second peak moves to the region of r / d O gradually. In addition, the linear relationship between the Re, L/d, α and Nus is obtained by linear analysis.
Inspec keywords: nozzles; jets; liquid crystals; heat transfer; confined flow; external flows; flow visualisation; air
Subjects: Nozzles; Jets in fluid dynamics; Convection and heat transfer; Flows in ducts, channels, and conduits; General fluid dynamics theory, simulation and other computational methods; Flow visualization and imaging
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