An experimental study of flow and heat transfer in parallel-plate arrays: local, row-by-row and surface average behavior

DeJong, N. C.; Jacobi, Anthony M.

doi:10.1016/s0017-9310(96)00186-x

Cited by 67 publications

(21 citation statements)

References 15 publications

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“…Near to the trailing edge the boundary layer becomes thinner due to the local flow acceleration as a small portion of the flow is deflected between the louvers. This result in higher heat transfer coefficient values near the trailing edge, a phenomenon also noted by DeJong and Jacobi in slit fins [17]. On the bottom side of the louver the boundary layer starts to grow from the leading edge.…”

Section: Resultsmentioning

confidence: 55%

“…In both fin types self-sustained unsteadiness is present from a certain Reynolds number which improves mixing and thus the heat transfer rate. This was studied in detail by DeJong and Jacobi [17] for slit fins and DeJong and Jacobi [18] for louvered fins through flow visualisation and mass transfer measurements. Tafti and Zhang [19] performed a detailed numerical study of the transition from steady laminar to unsteady flow in standard louvered fins.…”

Section: Main Flow Manipulationmentioning

confidence: 99%

“…Depending on the actual application the PEC could have an entirely different form, incorporating e.g. manufacturing costs, volume, weight… Figure 12 shows the PEC values for configurations 1 -9 and compare them to experimental data for three louvered fin designs (DeJong and Jacobi [18]) and one slit fin design (DeJong and Jacobi [17]). This reference data was determined experimentally through naphthalene sublimation experiments on scaled models.…”

Section: Comparison With Other Fin Typesmentioning

confidence: 99%

See 2 more Smart Citations

Interaction between mean flow and thermo-hydraulic behaviour in inclined louvered fins

T’Joen¹,

Huisseune²,

Canière³

et al. 2011

International Journal of Heat and Mass Transfer

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In this study the inclined louvered fin, a hybrid fin design based on the slit fin and louvered fin design is considered. The goal of the research program is to investigate the interaction between the flow behaviour (flow deflection and transition to unsteady flow) and the thermo-hydraulics of the fin design. This approach was selected in order to reveal the flow physics behind the transitions found in the thermo-hydraulic data.

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Section: Resultsmentioning

confidence: 55%

Section: Main Flow Manipulationmentioning

confidence: 99%

Section: Comparison With Other Fin Typesmentioning

confidence: 99%

See 1 more Smart Citation

Interaction between mean flow and thermo-hydraulic behaviour in inclined louvered fins

T’Joen¹,

Huisseune²,

Canière³

et al. 2011

International Journal of Heat and Mass Transfer

View full text Add to dashboard Cite

show abstract

“…The single ch!lfacteristic Strouhal number of 0.13 was independent of the Reynolds number and the number of columns. Dejong and Jacobi [8] have also speculated from their flow visualization studies that instabilities first appeared at the trailing edge of the last row of plates, which then propagated upstream. The same authors observed a similar pattern in multilouvered arrays [9].…”

Section: Introductionmentioning

confidence: 99%

Geometry effects on flow transition in multilouvered fins – onset, propagation, and characteristic frequencies

Tafti

Zhang

2001

International Journal of Heat and Mass Transfer

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The effect of fin pitch, louver angle and thickness, and flow depth on the onset, propagation, and characteristic frequencies of instabilities in multilouvered fins is investigated. The initial instability appears in the wake of the exit lo.uver. Subsequently, instabilities are established in the interior of the louver bank which spread upstream as the Reynolds number increases. It is shown that the interior instabilities are completely independent of the exit wake instability. On the other hand, the exit wake instability is not only dependent on the exit louver geometry but also on the internal geometry of the louver bank. Increasing louver thickness and angle increases the propensity of the flow to become unstable. Increasing fin pitch, louver angle, and thickness enhances the propagation of instabilities into the array. It is shown that the characteristic frequencies in the interior of the louver bank, scale with the fin pitch rather than the louver thickness or louver pitch. The exit wake frequencies, on the other hand scale with the projected length of the exit louver in the flow direction. A simplified model for estimating the onset of instabilities in the interior of the louver bank is proposed.

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“…Previous studies on the principle heat exchanger characteristics mainly focused on the heat transfer and pressure drop on the air side for fin-tube heat exchangers [1][2][3][4]. In the study of Lee and Yun, the mechanics of the fin-tube heat exchangers were categorized and divided into geometric and physical factors.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Heat Transfer Characteristics of the Enhanced Fin-Tube Heat Exchanger Applied a Coiled Turbulator

Byun

Lee

Cha

et al. 2017

Preprint

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This study presents the comparison of heat transfer capacity and pressure drop characteristics between a basic fin-tube heat exchanger and a modified heat exchanger with the structural change of branch tubes and coiled turbulators. All experiments were carried out using an air-enthalpy type calorimeter based on the method described in ASHRAE standards, under the heat exchanger experimental conditions. 14 different kinds of heat exchangers were used for the experiment. Cooling and heating capacities of the turbulator heat exchanger were excellent, compared to the basic one. As the insertion ratio of the coiled turbulator and the number of row increased, the heat transfer performance increased. However, the capacity per unit area was more effective in 4 rows than 6 rows, and the cooling performance of the 6 row turbulator heat exchanger (100% turbulator insertion ratio) was down to about 6% than that of 4 row one. As the water flow rate and the turbulator insertion ratio increased, the pressure drop of the water side increased. This trend was more pronounced in 6 rows. In the cooling condition, the pressure drop on the air side was slightly increased due to the generation of condensed water, but was insignificant under the heating condition. The power consumption of the pump was more affected by the water flow rate than the coiled turbulator. The equivalent hydraulic diameter of a tube by the turbulator was reduced and then the heat transfer performance was improved. Thus, the tube diameter was smaller, the heat flux was better.

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An experimental study of flow and heat transfer in parallel-plate arrays: local, row-by-row and surface average behavior

Cited by 67 publications

References 15 publications

Interaction between mean flow and thermo-hydraulic behaviour in inclined louvered fins

Interaction between mean flow and thermo-hydraulic behaviour in inclined louvered fins

Geometry effects on flow transition in multilouvered fins – onset, propagation, and characteristic frequencies

Experimental Study on the Heat Transfer Characteristics of the Enhanced Fin-Tube Heat Exchanger Applied a Coiled Turbulator

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