Effect of winglet location on heat transfer of a fin-and-tube heat exchanger

Sarangi, Shailesh Kumar; Mishra, Dipti Prasad

doi:10.1016/j.applthermaleng.2017.01.106

Cited by 49 publications

(15 citation statements)

References 15 publications

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“…Their research showed that the heat transfer is enhanced due to the longitudinal vortex. Sarangi and Mishra [21] studied the location of VGs in common flow up configuration and reported that the VGs near the central tube were effective at heat-transfer enhancement. Lu and Zhai [22] numerically studied the performance of tear-drop VGs in common flow up.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of Flow Symmetry and Heat Transfer of Winglet Pair in Common Flow Down Configuration

et al. 2020

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The effect of transverse pitch between a pair of delta-winglet vortex generators arranged in a common flow down configuration on the symmetrical flow structure and heat-transfer performance was numerically investigated. The results showed that symmetrical longitudinal vortices form a common flow down region between the vortices. The fluid is induced to flow from the top towards the bottom of the channel in the common flow region, which is advantageous to the heat transfer of the bottom fin. The vortex interaction increases and the vortex intensity decreases along with the decrease in transverse pitch of vortex generators. Vortex interaction has a slight influence on pressure penalty. The Nusselt number decreases with increasing vortex interaction. The vortices gradually attenuate and depart from each other during the process of flowing downward. A reasonable transverse pitch of delta-winglet vortex generators in a common-flow-down configuration is recommended for high thermal performance.

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Section: Introductionmentioning

confidence: 99%

Characteristics of Flow Symmetry and Heat Transfer of Winglet Pair in Common Flow Down Configuration

et al. 2020

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“…They found that tear-drop VGs can enhance the heat transfer with a negligible increase in the pressure drop. Sarangi and Mishra [23] studied the location of the VGs in the common flow up configuration and found that the placement of the VGs near the central tube was effective for heat transfer enhancement.…”

Section: Introductionmentioning

confidence: 99%

Flow Symmetry and Heat Transfer Characteristics of Winglet Vortex Generators Arranged in Common Flow up Configuration

2020

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The generation of longitudinal vortices is an effective method for promoting thermal performance with a relative low-pressure penalty in heat exchangers. The winglet pair can generate symmetrical longitudinal vortices on the cross-section of the channel. The heat transfer and pressure-loss characteristics of a pair of winglet vortex generators with different transverse pitches are numerically studied in this paper. The winglet pair arranged in a common flow up configuration generates a pair of symmetrical longitudinal main vortices with counter-rotating directions. The symmetrical flow structure induces fluid to flow from the bottom towards the top of the channel in the common flow region between the longitudinal vortices. The flow symmetry of the longitudinal vortices and the heat transfer performance are strongly affected by the transverse pitch of the winglet pair owing to the interaction between the longitudinal vortices. The optimal transverse pitch of the studied winglet pair with the best thermal performance is reported. The increments in the vortex intensity and the Nusselt number for the optimal pitch are increased by up to 21.4% and 29.2%, respectively.

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“…Mounting one to three pairs of DWP VGs causes the convection coefficient to increase by between 7.7% and 27.5% against the baseline at an inlet velocity of 0.4 m/s, while at an inlet velocity of 2 m/s, the convection coefficient increases by 26.5% to 66.5% against the baseline. The increase in convection coefficient is due to the emergence of LVs generated by the DWP VGs, which results in good mixing of the hot and cold fluids (Sarangi & Mishra, 2017).…”

Section: Thermal Performancementioning

confidence: 99%

Thermo-hydrodynamics Performance Analysis of Fluid Flow through Concave Delta Winglet Vortex Generators by Numerical Simulation

Syaiful¹,

Ayutasari²,

Soetanto³

et al. 2017

IJTech

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The numerical simulation of heat transfer and pressure drop characteristics was carried out on the airflow through a rectangular channel-mounted vortex generator (VG). The VG was installed on a plate that was attached to the heater. The inlet velocity of the airflow varied from 0.4 to 2.0 m/s. The VGs used in this study were concave delta winglet pairs (CDWPs) with the attack angle of 30° and with variation in the number of rows: one pair, two pairs, and three pairs. The CDWPs are predicted to produce the longitudinal vortex (LV), which increases the intensity of turbulence resulting in better mixing of flow. This, in turn, can improve the heat transfer between the plate surface and the airflow in the rectangular channel. The results showed that the installation of CDWPs does improve the overall heat transfer performance. However, it has the consequences of a greater pressure drop. Based on the variation in the number of rows, the greater the number of pairs of VGs was the greater the convection heat transfer coefficient (h) in both laminar and turbulent flows. The h value was based on the number of row of CDWPs: one pair, two pairs, and three pairs exhibited increases of 65.9108.4%; 34.471%; and 42.2110.7% compared to the baseline, respectively. A great number of rows of VGs also led to an increasing pressure drop value in laminar and turbulent flows. The percentage increases in pressure drop for CDWPs with one pair, two pairs, and three pairs, as compared to the baseline, were 70.192.1%; 123.6161.3%, and 180266.9%, respectively.

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Effect of winglet location on heat transfer of a fin-and-tube heat exchanger

Cited by 49 publications

References 15 publications

Characteristics of Flow Symmetry and Heat Transfer of Winglet Pair in Common Flow Down Configuration

Characteristics of Flow Symmetry and Heat Transfer of Winglet Pair in Common Flow Down Configuration

Flow Symmetry and Heat Transfer Characteristics of Winglet Vortex Generators Arranged in Common Flow up Configuration

Thermo-hydrodynamics Performance Analysis of Fluid Flow through Concave Delta Winglet Vortex Generators by Numerical Simulation

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