一种管式换热器和一种新型的方向相反的开孔矩形导流板的有效性

IF 1.4 Q2 ENGINEERING, MULTIDISCIPLINARY
Md Atiqur Rahman
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引用次数: 1

摘要

本实验研究的目的是研究一种新型的轴向热交换器,该换热器具有在加热管上旋转的空气运动。该装置设计有穿孔的圆形挡板,辅以以不同倾角工作的矩形导风板。管被安排在一个一致的布局平行于纵向气流。偏转板加剧的空气侧湍流引发了疯狂的运动,使表面传热率不断上升。设计/方法/方法这些管子在表面上保持恒定的热流状态。在每个挡板上,八个倾斜角度相同的偏转板被设计在相反的位置,形成一个圆形管道内的空气旋转,该管道容纳管道(携带热水),这增加了空气侧的湍流,从而提高了表面的传热率。挡板以不同的螺距比相等地彼此间隔。雷诺数保持在16000 - 30000之间。考察了考虑螺距比和倾角的换热器性能。研究表明,在相似条件下,与节段式折流板相比,采用偏导式折流板的换热器在30°的倾角和1.2的节距比下,热增强系数平均上升了0.19倍,与采用节距比的换热器相比,采用偏导式折流板的换热器对节距比和倾角的依赖性较强。研究结果表明,螺距比、雷诺数和倾角对换热系数和摩擦系数的影响是显著的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Effectiveness of a tubular heat exchanger and a novel perforated rectangular flow-deflector type baffle plate with opposing orientation
Purpose The purpose of this experimental research was to examine a novel axial heat exchanger featuring swirling air movement over heated tubes. This apparatus is designed with perforated circular baffle plates complemented by rectangular air deflectors operating at different inclination angles. The tubes were arranged in a consistent layout parallel to the longitudinal airflow. The deflector’s heightened air-side turbulence initiates the frenzied motion, escalating the surface heat transfer rate. Design/methodology/approach The tubes maintained a constant heat flux condition over the surface. In each baffle plate, eight deflectors with identical inclination angles were devised in a reverse position, forming a rotation of air inside a circular duct that held tubes (carrying hot water) which elevated air-side turbulence, thereby enhancing the rate of heat transference on the surface. The baffle plates were equally situated from each other at changing pitch ratios. The Reynolds quantity was preserved in the scope of 16,000–30,000. The performance of the heat exchanger considering pitch ratios and inclination angles was examined. Findings The research indicates that when examined under similar conditions, an exchanger with a deflector baffle plate shows a strong dependence on the pitch ratio and inclination angle with a mean rise of 0.19 times in thermal enhancement factor at an inclination angle of 30° and a pitch ratio of 1.2 contrasted with an exchanger with segmental baffle plates. Originality/value The result shows the dependence of pitch ratio, Reynolds number and inclination on the heat transfer and friction factor rate.
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来源期刊
World Journal of Engineering
World Journal of Engineering ENGINEERING, MULTIDISCIPLINARY-
CiteScore
4.20
自引率
10.50%
发文量
78
期刊介绍: The main focus of the World Journal of Engineering (WJE) is on, but not limited to; Civil Engineering, Material and Mechanical Engineering, Electrical and Electronic Engineering, Geotechnical and Mining Engineering, Nanoengineering and Nanoscience The journal bridges the gap between materials science and materials engineering, and between nano-engineering and nano-science. A distinguished editorial board assists the Editor-in-Chief, Professor Sun. All papers undergo a double-blind peer review process. For a full list of the journal''s esteemed review board, please see below.
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