Study the influence of concavity shapes on augmentation of heat‐transfer performance, pressure field, and fluid pattern in three‐dimensional pipe

Al‐Obaidi, Ahmed Ramadhan

doi:10.1002/htj.22079

Cited by 18 publications

(16 citation statements)

References 15 publications

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“…It is also possible to increase the heat exchange by changing the tube wall structure, increasing the energy dissipation in the tube, and reducing the reflected shock wave. For example, in the research of Al-Obaidi et al [17][18][19], different dimple geometrical configurations with a combination of corrugated tubes and twisted tape were numerically investigated. The study found that vortices and rotational flow originated behind and near the dimple, twisted tape, and corrugation surfaces.…”

Section: Introductionmentioning

confidence: 99%

Research on the Application Performance of the Helmholtz High-Efficiency Wave-Elimination Chamber in Gas Wave Tubes

et al. 2022

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A gas wave refrigerator is a device that uses gas pressure to expand and refrigerate; the moving shock wave in the gas wave tube is the key to cooling. If the shock wave is reflected to the open mouth of the gas wave tube, it will heat the expanded refrigeration gas at the open end, severely reducing the refrigeration efficiency. In order to reduce this effect, a Helmholtz middle wave chamber-type gas wave tube is presented here. This study describes the performance of this structure in the gas wave refrigeration process. The refrigeration performance of the structure’s gas wave tube use was evaluated experimentally and numerically using computational fluid dynamics (CFD). The function of the middle wave elimination chamber was studied and explained: the chamber turns the reflected shock wave back to the end section of the tube and converts part of the incoming shock wave to an expansion wave, which may counteract the reflected shock wave by escaping from wave elimination chamber. The experimental results showed that the structure increased refrigeration efficiency by about 2.9% (50 Hz), 2% (40 Hz), and 2.2% (25 Hz) at the corresponding ejection frequencies, and reduced the reflected shock wave intensity by 11%, which proves the high-efficiency energy dissipation performance and the significant increase in refrigeration efficiency of the Helmholtz-type gas wave tube.

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Section: Introductionmentioning

confidence: 99%

Research on the Application Performance of the Helmholtz High-Efficiency Wave-Elimination Chamber in Gas Wave Tubes

et al. 2022

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“…In general, the heat transfer is improved and enhanced by increasing the surface area transfer and turbulence. For example, the groove was used by Zheng et 1,2 to increase the surface area, the rib was used by Eiamsa-Ard et al 3,4 to increase the surface area and turbulence, the twisted tapes and screw were used by Tang et al 5,6 to promote the overall fluid mixing (turbulence). Most of the research has focused on studying the heat transfer and flow properties of the corrugated tubes due to the comparatively lower pressure reduction and improved heat transfer.…”

Section: Introductionmentioning

confidence: 99%

Flow felid and heat transfer enhancement investigations by using a combination of corrugated tubes with a twisted tape within 3D circular tube based on different dimple configurations

2021

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Different dimple geometrical configurations with a combination of corrugated tubes and twisted tape are numerically investigated. Water is used as a working fluid for constant heat flux heat transfer conditions at the pipe wall. The dimensionless diameter of the dimples (d/D) used in this study is 0.09, 0.18, 0.27, and 0.36. However, the corrugation configuration diameter is 1 mm. The numerical simulations are carried out at the Reynolds number in the range of 1500-14,000. The outcomes reveal that the friction factor (f) and Nu number are augmented as the dimple diameter increases. The Nu number ratio of 1.25 is found for a dimple pipe tube with a diameter of 4 mm. The numerical outcome presented more mixing, secondary, and vortex produced in the main flow direction and near the pipe wall to the rotating flow induced by twisted tape. Moreover, mixed, secondary vortices and rotational flow originate behind and near the dimple, twisted tape, and corrugation surfaces. These rotational and vortices can promote mixing in flow between the thermal boundary layer and velocity boundary flow layer. So, increase the heat transfer enhancement. The improved pipes with different dimple diameters produce a maximum performance evaluation factor of is more than 1.25. K E Y W O R D S corrugated pipe, dimple configurations, evaluation of thermal performance, heat transfer, twisted tape How to cite this article: Al-Obaidi AR, Alhamid J, Hamad F. Flow felid and heat transfer enhancement investigations by using a combination of corrugated tubes with a twisted tape within 3D circular tube based on different dimple configurations.

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“…The inserts of twisted tape in the pipes are widely used for this purpose. The use of computational fluid dynamics (CFD) codes can provide more information regarding the internal flow behavior, which is difficult to obtain by using traditional experimental tests 11,12 . Different studies were carried out to examine the best thermal heat transfer 13,14 .…”

Section: Introductionmentioning

confidence: 99%

Investigation of the flow, pressure drop characteristics, and augmentation of heat performance in a 3D flow pipe based on different inserts of twisted tape configurations

Al‐Obaidi

2021

Heat Trans

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The flow behavior, pressure drop, and heat performance rate in the three‐dimensional pipe with and without inserted tape are analyzed in his study. The enhancement of thermohydraulic performance is carried out by increasing the twisted tape configurations with different Re. The numerical simulation model is validated with experimental data, where the outcomes indicate a good agreement between both data. The results revealed that the pressure drop across the pipe using twisted tape insert was higher than in a smooth pipe. The increased drop in pressure along the pipe enhanced the performance of heat transfer. In addition, there was a rise in fluid velocity, but it was nonuniform. This happened due to the swirl created through the inserted tape in the pipe. The comparative study also specified that the profiles of dynamic pressure, static pressure, velocity magnitude, and vorticity are nonuniform, compared with the smooth tube type. Moreover, the results found that the best improvement of heat transfer is at a low value of mass flow with a twisted tape of 1 × 3 mm, which is equal to approximately 27.7%, 26.5%, 26.4%, and 22.9% respectively. Furthermore, this study provides numerical investigations for engineering design on flow field analysis and enhanced heat transfer performance with different insert tape configurations.

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Study the influence of concavity shapes on augmentation of heat‐transfer performance, pressure field, and fluid pattern in three‐dimensional pipe

Cited by 18 publications

References 15 publications

Research on the Application Performance of the Helmholtz High-Efficiency Wave-Elimination Chamber in Gas Wave Tubes

Research on the Application Performance of the Helmholtz High-Efficiency Wave-Elimination Chamber in Gas Wave Tubes

Flow felid and heat transfer enhancement investigations by using a combination of corrugated tubes with a twisted tape within 3D circular tube based on different dimple configurations

Investigation of the flow, pressure drop characteristics, and augmentation of heat performance in a 3D flow pipe based on different inserts of twisted tape configurations

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