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Experimental Study on Cross-Flow Induced Vibrations in Heat Exchanger tube bundle

China Ocean Engineering 2017年第1期31卷 91-97页

作者： KHUSHNOOD Shahab NIZAM Luqman Ahmad Department of Mechanical Engineering University of Engineering and Technology Taxila Pakistan Department of Mechanical Engineering HITEC University Taxila Pakistan

Vibration in heat exchangers is one of the main problems that the industry has faced over last few decades. Vibration phenomenon in heat exchangers is of major concern for designers and process engineers since it can lead to the tube damage, tube leakage, baffle damage, tube collision damage, fatigue, creep etc. In the present study, vibration response is analyzed on single tube located in the centre of the tube bundle having parallel triangular arrangement （60-） with P/D ratio of 1.44. The experiment is performed for two different flow conditions. This kind of experiment has not been reported in the literature. Under the first condition, the tube vibration response is analyzed when there is no internal flow in the tube and under the second condition, the response is analyzed when the internal tube flow is maintained at a constant value of 0.1 rn/s. The free stream shell side velocity ranges from 0.8 rn/s to 1.3 m/s, the reduced gap velocity varies from 1,80 to 2.66 and the Reynolds number varies from 44500 to 66000. It is observed that the internal tube flow results in larger vibration amplitudes for the tube than that without internal tube flow. It is also established that over the current range of shell side flow velocity, the turbulence is the dominant excitation mechanism for producing vibration in the tube since the amplitude varies directly with the increase in the shell side velocity. Damping has no significant effect on the vibration behavior of the tube for the current velocity range.

关键词： cross-flow tube bundle parallel Iriangular internal tube flow damping

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Particle Image Velocimetry Measurement of Flow Across tube bundle in Waste Heat Boiler

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Journal of Thermal Science 2000年第3期9卷 249-256页

作者： Chen Bin Guo Liejin (Xi’an Jiaotong University, Xi’an 710049, China ) Xi’an Jiaotong University Xi’an China

In the present paper the experimental investigations of flow across staggered tube bundles in waste heat boiler are conducted by mans of PIV (Particle Image Velocimetry) system. Flow visualization and velocity distribution of the wake between different cylinders are measured in detail. It is concluded that there are still Von Karman vortices in the wake and the phenomena of vortex shedding, pairing, merging are observed in the flow. The Von Karman vortices can’t fully developed because of the existence of the downstream cylinder There is interaction between main streams and vortices, and the development of the vortex is enhanced by this interaction. Meanwhile some statistical results are performed. The distribution of correlated variables of the velocity fluctuations u’ u’, u’ v’, v’ v’ and the space correlation coefficients are obtained.

关键词： tube bundle flow across cylinder turbulent wake.

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Experimental Study of Condensation Heat Transfer on tube bundles in Large Power Plant Condensers

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Journal of Energy and Power Engineering 2014年第5期8卷 920-928页

作者： Koichi Inoue Issaku Fujita Kotaro Machii Satoshi Hiraoka Manabu Ishihara Faculty of Environmental Engineering The University of Kitakyushu Fukuoka 8080135 Japan Takasago Machinery Works Mitsubishi Heavy Industries Ltd. Hyogo 6768686 Japan

In order to clarify the effect of condensate inundation on steam condensation in a large tube bundle, condensation heat transfer and the condensate flow pattern in the tube bundle have been experimentally investigated. Test tube bundle consists of 36 cooling tubes, 12 condensate supply tubes and 24 un-cooled dummy tubes. Cooling test tubes are made of copper and have an outer diameter of 19.1 mm and condensing length of 150 mm, Steam flows horizontally through the test tube bundle at gap velocities 15-27 m/s at pressures of 8.8 kPa. In this study, experimental data about condensate flow pattern and condensation heat transfer in a tube bundle were collected for the optimization of tube arrangement in large power plant condensers.

关键词： Condensation inundation condenser tube bundle tube arrangement power station.

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Cross Flow Characteristics and Heat Transfer of Staggered tubes bundle: A Numerical Study

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Frontiers in Heat and Mass Transfer 2023年第1期21卷 367-383页

作者： Husam Rashid Hudear Saad Najeeb Shehab Department of Mechanical Engineering College of EngineeringMustansiriyah UniversityBaghdadIraq

This paper presents a numerical emulation study of heat transmission through tube banks in *** configuration is displayed by fluid dynamics using computer programs(CFD)software(ANSYS fluent).The computer model is used to predict the values of the Nusselt number when changing the values of heat flux and longitudinal *** longitudinal pitch(SL/D)of 1.3,1.8,and 2.4 *** transverse pitch(ST/D)of 1.5 mm,and also considered Reynolds numbers 10000,13000,17000,and *** staggered configuration of the tube bundle is demonstrated to investigate the impact of this arrangement on the heat transmission rate from the *** gotten results indicate that the rate of heat transmission increases with decreases in the longitudinal spacing(SL).As the longitudinal spacing(SL)increases to about 44%the Nusselt number is slightly decreased by about 9%.The coefficient of heat transmission,Nusselt number,and the heat transmission data obtained from(CFD)Compared to previous research results,there is a decent agreement originating after comparison.

关键词： tube bundle numerical study longitudinal pitch cross-flow staggered

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Heat transfer simulation of annular elliptical fin-and-tube heat exchanger by transition SST model

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Journal of Central South University 2020年第8期27卷 2324-2337页

作者： H NEMATI A R RAHIMZADEH WANG Chi-chuan Department of Mechanics Marvdasht BranchIslamic Azad UniversityMarvdashtIran Mechanical Engineering Islamic Azad UniversityBushehr branchBushehrIran Department of Mechanical Engineering National Chiao Tung UniversityHsinchu 300TaiwanChina

In this study,thermo-fluid characteristics of elliptical annular finned tube heat exchanger were numerically studied in *** SST model was utilized to simulate turbulent *** of air velocities,horizontal to vertical fin diameter ratios,and fin densities were examined in *** simulations indicate superior performance of elliptical fin *** was shown that pressure drop of annular elliptical fin can be only one half of that of a circular annular fin while containing comparable heat transfer *** vertical elliptical annular fin may even contain a higher heat transfer performance over circular *** are proposed to estimate the Nu number and pressure drop based on the annular circular *** maximum deviations between the proposed correlations and simulations regarding pressure drop and heat transfer coefficient are 5.6%and 3.2%,*** further elaboration of the superiority of the elliptical layout from the second law perspective,normalized entropy generation was also *** all cases,the entropy generation rate in circular fin was higher than that of an elliptical fin.

关键词： annular fin elliptical fin entropy generation transition SST model tube bundle

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