循环流体加热--瞬态熵生成

IF 1.8 Q3 MECHANICS
Fluids Pub Date : 2024-05-18 DOI:10.3390/fluids9050119
Fikret Alic
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引用次数: 0

摘要

流体流动加热的一个技术问题是,流体通过加热表面时的温度增幅相对较小。流体在加热源内停留的时间不足以显著提高其温度,尽管加热源本身的温度也会大幅提高。为了应对这一挑战,我们提出了对空气进行多次循环加热的概念,这也是这项工作的基础。两个带有纵向翅片的 PTC 加热器位于由隔热材料组成的外壳内的封闭通道中。空气从一个翅片表面循环流向另一个翅片表面。分析中使用了分析模型和实验测试,并设定了限制条件和边界条件。分析的一个重要成果是在最大限度减少瞬态热熵的基础上,建立了优化几何参数和工艺参数的方法。在进行分析建模时,假设 PTC 加热器的温度恒定在 150 °C 和 200 °C。通过取消限制和调整边界条件,可以更广泛地应用已建立的方法来分析和优化各种热瞬态工业过程。瞬态热熵的实验测定是在封闭通道内的空气流量更高的 0.005 m3s-1 条件下进行的。最小瞬态热熵还表明了打开通道的最佳时间,使受热空气能够流出。这项工作的创新之处在于对流体进行受控循环加热,并将最小瞬态热熵作为优化标准。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Circular Fluid Heating—Transient Entropy Generation
A technical issue with fluid flow heating is the relatively small temperature increase as the fluid passes through the heating surface. The fluid does not spend enough time inside the heating source to significantly raise its temperature, despite the heating source itself experiencing a substantial increase. To address this challenge, the concept of the multiple circular heating of air was developed, forming the basis of this work. Two PTC heaters with longitudinal fins are located within a closed channel inside housing composed of a thermal insulation material. Air flows circularly from one finned surface to another. Analytical modeling and experimental testing were used in the analysis, with established restrictions and boundary conditions. An important outcome of the analysis was the methodology established for the optimization of the geometric and process parameters based on minimizing the transient thermal entropy. In conducting the analytical modeling, the temperature of the PTC heater was assumed to be constant at 150 °C and 200 °C. By removing the restrictions and adjusting the boundary conditions, the established methodology for the analysis and optimization of various thermally transient industrial processes can be applied more widely. The experimental determination of the transient thermal entropy was performed at a much higher air flow rate of 0.005 m3s−1 inside the closed channel. The minimum transient entropy also indicates the optimal time for the opening of the channel, allowing the heated air to exit. The novelty of this work lies in the controlled circular heating of the fluid and the establishment of the minimum transient thermal entropy as an optimization criterion.
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来源期刊
Fluids
Fluids Engineering-Mechanical Engineering
CiteScore
3.40
自引率
10.50%
发文量
326
审稿时长
12 weeks
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