PULSATILE FLOWS: EFFECTS OF FREQUENCY AND AMPLITUDE CHANGES ON HEAT TRANSFER

机译：脉动流量：频率和幅度变化对传热的影响

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One would expect flow pulsation to have a significantly positive effect on the efficiency of heat transfer. However, several decades of research into this type of flow has revealed conflicting conclusions on the advantages or disadvantages of pulsation on heat transfer. For an objective study of the published evidence, this research project was initiated. The study involved laboratory experiments with water flowing in a heated horizontal pipe. For this purpose, a special experimental apparatus was designed and built, and a large number of experiments were performed under different values of pulsation frequency and amplitude, superimposed over a varying main flow rate through the pipe. For the range of variables considered in this study (ie, 5,000 < Re < 23,000, 0.1 Hz ≤ f ≤ 1.0 Hz and various pulsation amplitudes), it was found that (a) increasing pulsation frequency improved the heat transfer by as much as 15%, (b) increasing pulsation amplitude reduced the heat transfer by as much as 25%, and (c) up to 50% heat transfer enhancement was obtained for pulsatile flows with flow reversal.

机译：人们希望流量脉动对热传递效率具有显着积极影响。然而，几十年的这种流程研究揭示了关于传热脉动的优缺点的矛盾结论。对于出版证据的客观研究，该研究项目已启动。该研究涉及在加热水平管中流动的水实验实验。为此目的，设计和构建了特殊的实验装置，并且在不同的脉动频率和幅度的不同值下进行了大量实验，通过管道叠加在不同的主流速上。对于本研究中考虑的变量范围（即，5,000

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《International Symposium on Heat Transfer Enhancement and Energy Conservation》|2004年||共9页
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Mir-Akbar Hessami;
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中图分类传热学;
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机译：水平管道中的传热增强：流速，脉动频率和振幅的影响
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6. Effects of two-phase inlet quality mass velocity flow orientation and heating perimeter on flow boiling in a rectangular channel: Part 1 – Two-phase flow and heat transfer results [O] . Chirag R. Kharangate, Lucas E. O’Neill, Issam Mudawar -1

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7. Discussion: “Force Convection Heat Transfer at an Inclined and Yawed Square Plate—Application to Solar Collectors” (Sparrow, E. M., and Tien, K. K., 1977, ASME J. Heat Transfer, 99, pp. 507–512) and “Local Heat Transfer and Fluid Flow Characteristics for Airflow Oblique or Normal to Square Plate” (Tien, K. K., and Sparrow, E. M., 1979, Internation Journal of Heat and Mass Transfer, 22, pp. 349–359) and “Effect of Finite Width on Heat Transfer and Fluid Flow about an Inclined Rectangular Plate” (Sparrow, E. M., Ramsey, J. W., and Mass, E. A., 1979, ASME J. Heat Transfer, 101, pp. 199–204) [O] . B. Nimmo, S. Zubair 1981

机译：讨论：“在倾斜和偏航的方形板应用于太阳能收集器的强制对流传热”（Sparrow，EM和Tien，KK，1977，Asme J.传热，99，PP。507-512）和“局部热量用于气流倾斜或正常板的转移和流体流动特性“（Tien，KK和Sparrow，EM，1979，热量和传质杂志，22，pp.349-359）和”有限宽度对热量的影响关于倾斜矩形板的转移和流体流动“（Sparrow，EM，Ramsey，JW和Mass，EA，1979，ASME J.传热，101，PP。199-204）
8. HEAT TRANSFER AND FLUID FLOW WITH APPLICATIONS TO PRESSURIZED WATER REACTORS VOLUME IInChapter 3:Fluid DynamicsnChapter 4:Heat Transfer in FluidsnChapter 5:Two-Phase Heat Transfer and Fluid FlownChapter 6:Heat Transfer by Radiation [R] . P. L. Pfennigwerth, Bill Minkler 1971

机译：应用于加压水反应堆的热传递和流体流量第二章第3章：流体动力学第4章：流体中的传热第5章：两相传热和流体流动第6章：辐射传热

PULSATILE FLOWS: EFFECTS OF FREQUENCY AND AMPLITUDE CHANGES ON HEAT TRANSFER

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