Experimental Investigations on Single-Phase Heat Transfer Enhancement in an Air-To-Water Heat Exchanger with Rectangular Perforated Flow Deflector Baffle Plate

IF 0.9 Q4 THERMODYNAMICS International Journal of Thermodynamics Pub Date : 2023-09-11 DOI:10.5541/ijot.1285385

Atıqur RAHMAN

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引用次数: 2

Abstract

Experimental analysis was conducted to investigate the turbulent heat transfer behaviors within a tubular heat exchanger, incorporating a novel baffle plate design. The new design includes a perforated circular baffle plate with a rectangular flow deflector that can be adjusted to different inclination angles. The baffle plate is strategically positioned at the entrance of the heat exchanger, resulting in a swirling flow downstream. To assess the impact of the baffle plate design, three baffle plates were placed longitudinally along the flow, with varying pitch ratios (l/D). The effects of pitch ratio (ranging from 0.6 to 1.2), deflector inclination angle (ranging between 30⁰ to 50⁰), and Reynolds numbers (ranging between 16000 to 29000) were examined. The outcomes highlighted the substantial impact of pitch ratio and inclination angle on the thermal enhancement factor. In particular, compared to single segmental baffle plates working under similar operating conditions. The result indicates that an inclination angle of 30° and a pitch ratio of 1 exhibited an average 41.49% augmentation in thermal-fluidic performance compared with an exchanger with a segmental baffle plate.

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矩形多孔折流板空气-水换热器单相强化换热实验研究

对采用新型折流板设计的管式换热器紊流换热特性进行了实验研究。新的设计包括一个穿孔的圆形挡板和一个矩形的气流偏转板，可以调整到不同的倾角。折流板策略性地定位在热交换器的入口，导致下游的旋流。为了评估挡板设计的影响，三个挡板沿流动纵向放置，具有不同的螺距比(l/D)。研究了俯距比(0.6至1.2)、偏转器倾角(30⁰至50⁰)和雷诺数(16000至29000之间)的影响。结果表明，俯仰比和倾角对热增强系数有重要影响。特别是与在相似工况下工作的单节段折流板相比。结果表明，当换热器倾角为30°、节距比为1时，换热器的热流性能比带节段折流板的换热器平均提高41.49%。

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来源期刊

International Journal of Thermodynamics THERMODYNAMICS-

CiteScore

1.50

自引率

12.50%

发文量

期刊介绍： The purpose and scope of the International Journal of Thermodynamics is · to provide a forum for the publication of original theoretical and applied work in the field of thermodynamics as it relates to systems, states, processes, and both non-equilibrium and equilibrium phenomena at all temporal and spatial scales. · to provide a multidisciplinary and international platform for the dissemination to academia and industry of both scientific and engineering contributions, which touch upon a broad class of disciplines that are foundationally linked to thermodynamics and the methods and analyses derived there from. · to assess how both the first and particularly the second laws of thermodynamics touch upon these disciplines. · to highlight innovative & pioneer research in the field of thermodynamics in the following subjects (but not limited to the following, novel research in new areas are strongly suggested): o Entropy in thermodynamics and information theory. o Thermodynamics in process intensification. o Biothermodynamics (topics such as self-organization far from equilibrium etc.) o Thermodynamics of nonadditive systems. o Nonequilibrium thermal complex systems. o Sustainable design and thermodynamics. o Engineering thermodynamics. o Energy.