Evaporation heat transfer and pressure drop in flattened microfin tubes having different aspect ratios

Lee, E.J.; Kim, N.H.

doi:10.1016/j.ijheatmasstransfer.2015.08.096

Cited by 13 publications

(2 citation statements)

References 31 publications

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“…Nasr et al (11) evaluated the heat transfer performance of flattened tube and stated that 5.5 mm internal height has the best performance in range of 2.8 mm to 6.6 mm when considering heat transfer and pressure drop. Kim, Lee and their colleagues (12,13) conducted experiment on evaporation of R-410A in flattened smooth tube and flatten micro-fin tube also concluded that heat transfer and pressure drop increase as the aspect ratio increase similar to single phase flow. Azarhazin et al (14) experimentally investigated boiling heat transfer and pressure drop of R1234yf flow in smooth flattened tubes.…”

Section: Introductionmentioning

confidence: 96%

Numerical Investigation of Boiling Flow in Oval Tube with Different Ellipticity

Liaw

Kurnia

2022

ECS Trans.

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Improving heat transfer has been the continuous quest in thermal engineering field. With higher transfer rate required, many researchers have shifted their attention towards boiling heat transfer that offer superior transfer rate. Despite its potential, study on this heat transfer process have not been as extensive as its single-phase counterpart. Particularly, to the best of our knowledge, no study on the boiling heat transfer in oval tube with different ellipticity. Thus, numerical investigation using RPI wall boiling model and RNG k-ε turbulence model is conducted for different ellipticity of the oval tube. It is found that the heat transfer performance drops as the ellipticity increases with constant perimeter. Decrease of heat flux and increase of mass flow rate have positive impacts toward the heat transfer performance. The vapor generation resulting by the heat flux and mass flow rate is having high influence in the heat transfer coefficient and pressure drop.

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Section: Introductionmentioning

confidence: 96%

Numerical Investigation of Boiling Flow in Oval Tube with Different Ellipticity

Liaw

Kurnia

2022

ECS Trans.

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“…The enhancement of heat transfer in different heat exchangers can decrease the system's cost and size 1‐4 . Different additional methods are employed to improve the heat transfer, such as fins, 4 variety of finned tubes, 5,6 various microfinned tubes, 7 louvered types, 8 wire brush type, 9 coiled wires, 10 and a variety of twisted tape configurations. The inserts of twisted tape in the pipes are widely used for this purpose.…”

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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Investigation of the flow boiling performance in mini channel with micro pin fin

Yubing

Zhang

et al. 2023

Heat Mass Transfer

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Evaporation heat transfer and pressure drop in flattened microfin tubes having different aspect ratios

Cited by 13 publications

References 31 publications

Numerical Investigation of Boiling Flow in Oval Tube with Different Ellipticity

Numerical Investigation of Boiling Flow in Oval Tube with Different Ellipticity

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

Investigation of the flow boiling performance in mini channel with micro pin fin

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