识别 TiO2 涂层表面形成的莱顿弗罗斯特现象并建立传热过程模型

Materials Pub Date : 2024-07-25 DOI:10.3390/ma17153687
M. Maziukienė, N. Striūgas, L. Vorotinskienė, R. Skvorčinskienė, M. Urbonavičius
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引用次数: 0

摘要

在各种工业应用中,如核沸腾、减小阻力或在涂层技术中获得更好的表面特性,对试样冷却动力学和试样周围可能出现的薄膜沸腾进行实验是非常重要的。本研究的目的是研究在不同边界条件下样品的传热过程和冷却动力学之间的相互作用。本文介绍了涂有 Al-TiO2 薄膜的试样以及薄膜表面莱顿弗罗斯特现象(LP)形成的新实验数据。此外,本文还介绍了传热和传质参数的数值结果。对 Al-TiO2 薄膜试样和其他涂层(如抛光铝、Al-MgO、Al-MgH2 和 Al-TiH2)的新实验进行的对比分析提供了有关氧化物和氢化物材料的更多细节。在冷却动力学实验中,试样被加热至 450 °C,过冷却水温度分别为 14*-20 °C(室温)、40 °C 和 60 °C。应用牛顿冷却定律计算了试样的冷却动力学,并通过计算从试样表面传递的热通量 q 和 Bi 参数估算了传热量。实验的元数据结果被用来为不同材料试样的冷却动力学曲线建立数值模型。针对抛光铝、Al-TiO2、Al-MgO、Al-MgH2 和 Al-TiH2 材料提出了近似多项式方程。通过比较分析,可以看出氧化物和氢化物之间的差异,并为工业领域的实际应用选择材料。所提供的结果也可用于模拟传热过程的软件包中。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The Identification of Leidenfrost Phenomenon Formation on TiO2-Coated Surfaces and the Modelling of Heat Transfer Processes
Experiments on specimen cooling dynamics and possible film boiling around a body are very important in various industrial applications, such as nucleate boiling, to decrease drag reduction or achieve better surface properties in coating technologies. The objective of this study was to investigate the interaction between the heat transfer processes and cooling dynamics of a sample in different boundary conditions. This article presents new experimental data on specimens coated with Al–TiO2 film and Leidenfrost phenomenon (LP) formation on the film’s surface. Furthermore, this manuscript presents numerical heat and mass transfer parameter results. The comparative analysis of new experiments on Al–TiO2 film specimens and other coatings such as polished aluminium, Al–MgO, Al–MgH2 and Al–TiH2 provides further detail on oxide and hydride materials. In the experimental cooling dynamics experiments, specimens were heated up to 450 °C, while the sub-cooling water temperatures were 14*‒20 °C (room temperature), 40 °C and 60 °C. The specimens’ cooling dynamics were calculated by applying Newton’s cooling law, and heat transfer was estimated by calculating the heat flux q transferred from the specimens’ surface and the Bi parameter. The metadata results from the performed experiments were used to numerically model the cooling dynamics curves for different material specimens. Approximated polynomial equations are proposed for the polished aluminium, Al–TiO2, Al–MgO, Al–MgH2 and Al–TiH2 materials. The provided comparative analysis makes it possible to see the differences between oxides and hydrides and to choose materials for practical application in the industrial sector. The presented results could also be used in software packages to model heat transfer processes.
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