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用于混合流传热分析的脉动双射流机制的发展

Development of pulsating twin jets mechanism for mixing flow heat transfer analysis.

作者信息

Gitan Ali Ahmed, Zulkifli Rozli, Abdullah Shahrir, Sopian Kamaruzzaman

机构信息

Department of Mechanical and Materials Engineering, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia (UKM), 43600 Bangi, Selangor, Malaysia ; Department of Mechanical Engineering, College of Engineering, University of Tikrit, Tikrit, Iraq.

Department of Mechanical and Materials Engineering, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia (UKM), 43600 Bangi, Selangor, Malaysia.

出版信息

ScientificWorldJournal. 2014 Feb 2;2014:767614. doi: 10.1155/2014/767614. eCollection 2014.

DOI:10.1155/2014/767614
PMID:24672370
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC3929578/
Abstract

Pulsating twin jets mechanism (PTJM) was developed in the present work to study the effect of pulsating twin jets mixing region on the enhancement of heat transfer. Controllable characteristics twin pulsed jets were the main objective of our design. The variable nozzle-nozzle distance was considered to study the effect of two jets interaction at the mixing region. Also, the phase change between the frequencies of twin jets was taken into account to develop PTJM. All of these factors in addition to the ability of producing high velocity pulsed jet led to more appropriate design for a comprehensive study of multijet impingement heat transfer problems. The performance of PTJM was verified by measuring the pulse profile at frequency of 20 Hz, where equal velocity peak of around 64 m/s for both jets was obtained. Moreover, the jet velocity profile at different pulsation frequencies was tested to verify system performance, so the results revealed reasonable velocity profile configuration. Furthermore, the effect of pulsation frequency on surface temperature of flat hot plate in the midpoint between twin jets was studied experimentally. Noticeable enhancement in heat transfer was obtained with the increasing of pulsation frequency.

摘要

在本研究中开发了脉动双射流机制（PTJM），以研究脉动双射流混合区域对强化传热的影响。可控特性的双脉冲射流是我们设计的主要目标。考虑可变的喷嘴间距来研究混合区域中两股射流相互作用的影响。此外，还考虑了双射流频率之间的相位变化来开发PTJM。除了能够产生高速脉冲射流外，所有这些因素都为全面研究多射流冲击传热问题带来了更合适的设计。通过测量20Hz频率下的脉冲轮廓验证了PTJM的性能，在此频率下，两股射流均获得了约64m/s的等速峰值。此外，测试了不同脉动频率下的射流速度轮廓以验证系统性能，结果显示出合理的速度轮廓配置。此外，还通过实验研究了脉动频率对双射流中点处平板热表面温度的影响。随着脉动频率的增加，传热得到了显著增强。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fe09/3929578/a141a88a7569/TSWJ2014-767614.014.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fe09/3929578/4cc688a9ecd9/TSWJ2014-767614.011.jpg
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