Research on the air-side thermal hydraulic performance of louvered fin and flat tube heat exchangers under low-pressure environment

Wan, Rui; Wang, Yichun; Кавтарадзе, Р. З.; Ji, Hongzeng; He, Xinglei

doi:10.1080/08916152.2019.1570985

Cited by 13 publications

(12 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A model of louvered fin in ref. [4a] is established and meshed, and the number of mesh varies from 100 000 to 1.3 million. The difference between results of 900 000 grid and 550 000 grid is less than 1%, considering the calculation accuracy and cost, 550 000 grids can meet the current research.…”

Section: Simulation Methodsmentioning

confidence: 99%

“…The calculation of the air side j and f factors of the louvered fins is based on the correlation obtained by Wan et al. [ 4a ]

\begin{align}j& = 0.856{{\mathop{\rm Re}\nolimits} ^{ - 0.472}}{\left( {\frac{{{L_{{\alpha}}}}}{{90}}} \right)^{0.0301}}{\left( {\frac{{{F_{\rm{p}}}}}{{{L_{\rm{p}}}}}} \right)^{0.375}}{\left( {\frac{{{F_{\rm{h}}}}}{{{L_{\rm{p}}}}}} \right)^{ - 0.775}}\nonumber\\ &\times{\left( {\frac{{{L_{\rm{h}}}}}{{{L_{\rm{p}}}}}} \right)^{0.599}}{\left( {\frac{{{L_{\rm{d}}}}}{{{L_{\rm{p}}}}}} \right)^{ - 0.0346}}{\left( {\frac{p}{{{p_0}}}} \right)^{0.0607}}\end{align}

\begin{align}f &= 0.711{{\mathop{\rm Re}\nolimits} ^{ - 0.442}}{\left( {\frac{{{L_{{\alpha}}}}}{{90}}} \right)^{0.864}}{\left( {\frac{{{F_{\rm{p}}}}}{{{L_{\rm{p}}}}}} \right)^{ - 0.262}}{\left( {\frac{{{F_{\rm{h}}}}}{{{L_{\rm{p}}}}}} \right)^{0.7}}{\left( {\frac{{{L_{\rm{h}}}}}{{{L_{\rm{p}}}}}} \right)^{ - 0.308}}\nonumber\\ &\times{\left( {\frac{{{L_{\rm{d}}}}}{{{L_{\rm{p}}}}}} \right)^{0.478}}{\left( {\frac{p}{{{p_0}}}} \right)^{ - 0.438}}\end{align}

…”

Section: Mathematical Modelsmentioning

confidence: 99%

“…The established thermal calculation model is used to calculate the heat exchangers in literature. [ 4a ] Results of the calculation model and experiments are compared in Figure . The variation of convective heat transfer coefficient is as shown in Figure 2a.…”

Section: Mathematical Modelsmentioning

confidence: 99%

See 2 more Smart Citations

Modeling and Performance Optimization of Louvered Fin Radiators in Negative Gauge Pressure Condition

Wan

Liu

et al. 2022

Advcd Theory and Sims

Self Cite

View full text Add to dashboard Cite

The purpose of this paper is to study the effect of the structural parameters of louvered fin radiators on its thermal‐hydraulic performance, optimize its structural parameters, and improve the performance of louvered fin radiators in negative gauge pressure condition. The thermal calculation model of louvered fin radiator in negative gauge pressure is established. Then, the effects of design variables on thermal‐hydraulic characteristics are investigated. The second generation of nondominated sorting genetic algorithm (NSGA‐II) is applied to optimize the louvered fin heat exchanger in negative gauge pressure environment. Technique for order preference by similarity to an ideal solution is applied to choose the final optimal solution. Numerical simulation of the solution is conducted and the result is compared with literature in order to verify the optimization method. The optimal structural parameters are obtained under constraints. Compared with the original test piece, the heat transfer rate of optimal solution is increased by 7.7%, and total annual cost is reduced by 24.8%. The present paper establishes optimization method of louvered fin radiators in negative gauge pressure condition, the optimization result is superior to the original radiator. The optimization method can be used in the design of radiators operating in negative gauge pressure conditions.

show abstract

Section: Simulation Methodsmentioning

confidence: 99%

“…The calculation of the air side j and f factors of the louvered fins is based on the correlation obtained by Wan et al. [ 4a ]

\begin{align}j& = 0.856{{\mathop{\rm Re}\nolimits} ^{ - 0.472}}{\left( {\frac{{{L_{{\alpha}}}}}{{90}}} \right)^{0.0301}}{\left( {\frac{{{F_{\rm{p}}}}}{{{L_{\rm{p}}}}}} \right)^{0.375}}{\left( {\frac{{{F_{\rm{h}}}}}{{{L_{\rm{p}}}}}} \right)^{ - 0.775}}\nonumber\\ &\times{\left( {\frac{{{L_{\rm{h}}}}}{{{L_{\rm{p}}}}}} \right)^{0.599}}{\left( {\frac{{{L_{\rm{d}}}}}{{{L_{\rm{p}}}}}} \right)^{ - 0.0346}}{\left( {\frac{p}{{{p_0}}}} \right)^{0.0607}}\end{align}

\begin{align}f &= 0.711{{\mathop{\rm Re}\nolimits} ^{ - 0.442}}{\left( {\frac{{{L_{{\alpha}}}}}{{90}}} \right)^{0.864}}{\left( {\frac{{{F_{\rm{p}}}}}{{{L_{\rm{p}}}}}} \right)^{ - 0.262}}{\left( {\frac{{{F_{\rm{h}}}}}{{{L_{\rm{p}}}}}} \right)^{0.7}}{\left( {\frac{{{L_{\rm{h}}}}}{{{L_{\rm{p}}}}}} \right)^{ - 0.308}}\nonumber\\ &\times{\left( {\frac{{{L_{\rm{d}}}}}{{{L_{\rm{p}}}}}} \right)^{0.478}}{\left( {\frac{p}{{{p_0}}}} \right)^{ - 0.438}}\end{align}

…”

Section: Mathematical Modelsmentioning

confidence: 99%

See 1 more Smart Citation

Modeling and Performance Optimization of Louvered Fin Radiators in Negative Gauge Pressure Condition

Wan

Liu

et al. 2022

Advcd Theory and Sims

Self Cite

View full text Add to dashboard Cite

show abstract

“…The pressure drops of the two heat transfer units were measured with a U-tube manometer. The equal power heating method described in [24] was adopted to heat the hot water bath to reduce the heat balance and experiment time. The water pipe, test channel and test unit were wrapped with 10 mm heat insulation materials for insulation.…”

Section: Wind Tunnel Testsmentioning

confidence: 99%

Experimental Study on Flow and Heat Transfer Characteristics in the Circular-Arc-Shaped Flow Channel

Song

Fan

2021

Applied Sciences

View full text Add to dashboard Cite

Different parameters of the circular-arc, trapezoidal and equal cross-section-shaped flow channels were analyzed, and the core volume goodness factor was used for the comparison of the three different types of flow channels. During the experiment, the Reynolds number (Re) on the air side ranged from 1200 to 5100. The results showed that the overall heat transfer performance of the three channels in this paper are circular-arc, trapezoidal and equal cross-section in order from good to bad. The overall heat transfer enhancement performance of the circular-arc flow channel is the best, which is 9–26.2% and 3.6–11.8% higher than that of the equal and trapezoidal cross-section flow channels, respectively. This showed that although the divergent flow channel structure reduces the fluid velocity in the flow process, it weakens the convective heat transfer performance in the flow channel. However, this gradually decreasing cross-sectional area improves the downstream heat transfer area and reduces the pressure drop in the flow process, thus promoting the overall heat transfer performance. With the increase in the circular radius (R), both the j and f factors increase, and the highest overall heat transfer performance is obtained at R = 300 mm. The convective heat transfer coefficient increases with the decrease in the inlet height.

show abstract

“…Generally, the large thermal resistance of FTHEs is yielded by the air-side due to the thermo-physical property of air [6,7]. The energy efficiency on the gas side of the independent FTHEs may be increased by changing the tube and fin shapes [8][9][10][11][12]. Furthermore, the fluid recirculation in the thermally dead zones and the pressure drop due to the drag force are widely affected by the tube shape [13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Thermal-Flow Characteristics in Heat Exchanger with Various Tube Shapes

et al. 2021

View full text Add to dashboard Cite

In this study, eight configurations of oval and flat tubes in annular finned-tube thermal devices are examined and compared with the conventional circular tube. The objective is to assess the effect of tube flatness and axis ratio of the oval tube on thermal-flow characteristics of a three-row staggered bank for Re (2600 ≤ Re ≤ 10,200). It has been observed that the thermal exchange rate and Colburn factor increase according to the axis ratio and the flatness, where O1 and F1 provide the highest values. O1 produces the lowest friction factor values of all the oval tubes at all Re, and F4 gives 13.2–18.5% less friction than the other tube forms. In terms of performance evaluation criterion, all of the tested tubes outperformed the conventional circular tube (O5), with O1 and F1 obtaining the highest values. The global performance criterion of O1 has been found to be 9.6–45.9% higher as compared to the other oval tube geometries at lower values of Re, and the global performance criterion increases with the increase in flatness. The F1 tube shape outperforms all the examined tube designs; thus, this tube geometry suggests that it be used in energy systems.

show abstract

Research on the air-side thermal hydraulic performance of louvered fin and flat tube heat exchangers under low-pressure environment

Cited by 13 publications

References 26 publications

Modeling and Performance Optimization of Louvered Fin Radiators in Negative Gauge Pressure Condition

Modeling and Performance Optimization of Louvered Fin Radiators in Negative Gauge Pressure Condition

Experimental Study on Flow and Heat Transfer Characteristics in the Circular-Arc-Shaped Flow Channel

Numerical Investigation of Thermal-Flow Characteristics in Heat Exchanger with Various Tube Shapes

Contact Info

Product

Resources

About