Performance enhancement of a louvered fin heat exchanger by using delta winglet vortex generators

Huisseune, Henk; T’Joen, Christophe; Jaeger, Peter De; Ameel, Bernd; Schampheleire, Sven De; Paepe, Michel De

doi:10.1016/j.ijheatmasstransfer.2012.09.004

Cited by 96 publications

(30 citation statements)

References 43 publications

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“…At higher Reynolds numbers the gain is small. As explained by Huisseune [10], at low Reynolds numbers the delta winglets highly contribute to the improved Colburn j-factors, while at higher Reynolds numbers the performance is mainly determined by the louver geometry. The discontinuity in the louvered fin Colburn correlation appears for Re Dc = 1000 (Reynolds number based on the collar diameter D c and the velocity in the minimum cross section flow area V c ).…”

Section: Performance Evaluation Of the Compound Heat Exchangermentioning

confidence: 84%

“…Averaging out over a longer time interval did not result in any notable differences in the simulation results. A validation experiment was performed which showed that there is an acceptable match between the simulation results and the experimental data [10]. Figure 4 shows the temperature contours in planes parallel to the fin surface for the baseline geometry without delta winglets and the compound heat exchanger with delta winglets for an inlet velocity of The air temperature in these zones is very high (close to 50°C, i.e.…”

Section: Computational Domain and Proceduresmentioning

confidence: 88%

“…This allowed the residuals to decrease below 10 -8 in less than 50 iterations per time step. The mass-weighted average pressure drop and outlet temperature were monitored during the iterations to determine if the simulations had converged [9]. Local temperatures in the tube and louver wakes were also monitored.…”

Section: Computational Domain and Proceduresmentioning

confidence: 99%

“…The LMTD method was used to simulate the heat transfer and pressure drop [9]. The performance of the heat exchangers is evaluated based on the Colburn j-factor and the friction factor f. They are plotted as function of the Reynolds number Re Dh (Eq.…”

Section: Performance Evaluation Of the Compound Heat Exchangermentioning

confidence: 99%

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Numerical study of a round tube heat exchanger with louvered fins and delta winglets

Huisseune¹,

T’Joen²,

Jaeger³

et al. 2012

J. Phys.: Conf. Ser.

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Abstract. Louvered fin and round tube heat exchangers are widely used in air conditioning devices and heat pumps. In this study the effect of punching delta winglet vortex generators in the louvered fin surface is studied numerically. The delta winglets are located in a commonflow-down orientation behind each tube of the staggered tube layout. It is shown that the generated vortices significantly reduce the size of the tube wakes. Three important heat transfer enhancement mechanisms can be distinguished: a better flow mixing, boundary layer thinning and a delay in flow separation from the tube surface. The compound heat exchanger has a better thermal hydraulic performance then when only louvers or only delta winglets are used. Comparison to other enhanced fin designs clearly shows its potential, especially for low Reynolds number applications.

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Section: Performance Evaluation Of the Compound Heat Exchangermentioning

confidence: 84%

Section: Computational Domain and Proceduresmentioning

confidence: 88%

Section: Computational Domain and Proceduresmentioning

confidence: 99%

Section: Performance Evaluation Of the Compound Heat Exchangermentioning

confidence: 99%

See 2 more Smart Citations

Numerical study of a round tube heat exchanger with louvered fins and delta winglets

Huisseune¹,

T’Joen²,

Jaeger³

et al. 2012

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

show abstract

“…A first comparison is carried out with the correlations available in the literature with a purely predictive model by obtaining a predictive value with a systematic under prediction lower than 10%. In a [2] Louvered fin and round tube heat exchangers are widely used in air conditioning devices and heat pumps. In this study the effect of punching delta winglet vortex generators into the louvered fin surface in the near wake region of each tube was numerically investigated using computational fluid dynamics (CFD).…”

Section: G Compound Heat Exchangermentioning

confidence: 99%

Numerical and Experimental study of Louvered Fin Heat Exchangers and Increasing the Heat Transfer capacity by Geometrical and Flow parameters using CFD

Kumar¹

2017

IJRASET

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Louvered fin heat exchanger is a type of compact Heat exchanger that consists of a stack of alternate flat plates called parting sheets and corrugated fins, both being brazed together as a block. Streams exchange heat by flowing along the passages made by the fins between the parting sheets. Separating plates act as the primary heat transfer surfaces and the appendages known as fins act as the secondary heat transfer surfaces intimately bonded to the primary surface. Aluminium is the most commonly used material and stainless steel is employed in high pressure and high temperature applications. CFD Simulation results show an excellent flow phenomenon with the basis of stability and accuracy. Results show the best combination of the angle for optimum pressure drop and heat transfer rate. In current study the temperature drop is increase with increase in louver angle, turbulent is high near to the winglet. As the velocity of air is increase the temperature drop is decreased. We found that when louvered angle, velocity, pressure, Temperatures are the best combination of the angle for optimum pressure drop and heat transfer rate.

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Heat transfer intensification with field synergy principle in a fin‐and‐tube heat exchanger through convex strip installation

Syaiful

Wicaksono

et al. 2022

Engineering Reports

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Improvement of heat transfer using surface protrusion (convex strip) has been effective recently. Surface protrusion is able to improve flow mixing which increases the rate of heat transfer. Therefore, this study aims to improve the heat transfer in a fin-and-tube heat exchanger by fitting convex strips around the tubes. Three-dimensional modeling was carried out by placing four and eight convex strips around the staggered tubes at a constant temperature of 106 • C. The turbulent k-ε model was applied at a Reynolds number range of 3438-15,926.The results of the study indicate that tubes with eight convex strips demonstrated a heat transfer improvement of 40.46%, compared to that with four convex strips. In this case, the TEF is 6.27% higher than the four convex strips. In addition, the synergy angle in the eight convex strips configuration was 0.13% lower than that of the four convex strips configuration. Meanwhile, the flow resistance in the tubes with eight convex strips configurations was 30.96% higher than that of the four convex strips.

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Performance enhancement of a louvered fin heat exchanger by using delta winglet vortex generators

Cited by 96 publications

References 43 publications

Numerical study of a round tube heat exchanger with louvered fins and delta winglets

Numerical study of a round tube heat exchanger with louvered fins and delta winglets

Numerical and Experimental study of Louvered Fin Heat Exchangers and Increasing the Heat Transfer capacity by Geometrical and Flow parameters using CFD

Heat transfer intensification with field synergy principle in a fin‐and‐tube heat exchanger through convex strip installation

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