Proposing a New Egg-Shaped Profile to Further Enhance the Hydrothermal Performance of Extended Dimple Tubes in Turbulent Flows

IF 2.9 4区 综合性期刊 Q1 Multidisciplinary
Masoud Darbandi, Kazem Mashayekh, Mohammad-Saleh Abdollahpour
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引用次数: 0

Abstract

Tube dimpling is known as an innovative approach, which has greatly helped to enhance the thermal performance of ordinary tubes. Although dimples mostly increase the thermal performance of ordinary tubes, they likely increase the fluid flow pressure drop and cause a reduction in its hydraulic performance. The primary goal of the present work is to introduce a new egg-shaped profile, which can considerably improve the hydrothermal efficiencies compared with the hydrothermal performances of the past extended dimple tubes, e.g., the spherical, conical, and elliptical ones. The present research is carried out using the numerical simulation approach; however, the experimental data is used to validate the numerical results. After demonstrating the accuracy of the employed numerical method, the performance evaluation criterion (PEC) parameter is used to evaluate the hydrothermal performance of the present dimpled-tubes equipped with the new egg-shaped dimple profiles. The present calculated PEC values are then compared with those of similar dimpled-tubes; however, equipped with the previously developed dimple profiles. The data conclusion is that the dimpled-tube with the present egg-shaped profile will provide at least 12.5% greater thermal performance than that of the previously developed dimpled-tube with the best practicing dimple profile. One of the key findings of this study is that the PEC value of the egg-shaped dimpled tube is double that of the corresponding smooth tube. This improvement is largely attributed to a higher turbulence mixing phenomenon caused by the egg-shaped dimples.

Abstract Image

提出一种新的蛋形轮廓,以进一步提高扩展酒窝管在湍流中的水热性能
众所周知,管材凹陷是一种创新方法,它大大有助于提高普通管材的热性能。虽然凹痕大多能提高普通管道的热性能,但很可能会增加流体流动压降,导致其水力性能下降。本研究的主要目标是引入一种新的蛋形轮廓,与过去的球形、锥形和椭圆形等加长型窝纹管的水热性能相比,它能大大提高水热效率。本研究采用了数值模拟方法,但也使用了实验数据来验证数值结果。在证明了所采用的数值方法的准确性后,使用性能评估标准(PEC)参数来评估配备了新的蛋形凹陷轮廓的凹陷管的水热性能。然后,将计算出的 PEC 值与配备了先前开发的凹陷轮廓的类似凹陷管的 PEC 值进行比较。数据得出的结论是,采用目前这种蛋形凹槽的凹陷管的热性能比以前开发的具有最佳凹槽轮廓的凹陷管至少高出 12.5%。这项研究的主要发现之一是,蛋形凹陷管的 PEC 值是相应光滑管的两倍。这一改进主要归功于蛋形凹痕造成的更高的湍流混合现象。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Arabian Journal for Science and Engineering
Arabian Journal for Science and Engineering 综合性期刊-综合性期刊
CiteScore
5.20
自引率
3.40%
发文量
0
审稿时长
4.3 months
期刊介绍: King Fahd University of Petroleum & Minerals (KFUPM) partnered with Springer to publish the Arabian Journal for Science and Engineering (AJSE). AJSE, which has been published by KFUPM since 1975, is a recognized national, regional and international journal that provides a great opportunity for the dissemination of research advances from the Kingdom of Saudi Arabia, MENA and the world.
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