Numerical analysis of thermal-hydraulic characteristics on serrated fins with different attack angles and wavelength to fin length ratio

Zhang, Xilong; Wang, Yichun; Yu, Zhiyi; Zhao, Danwei

doi:10.1016/j.applthermaleng.2015.08.022

Cited by 21 publications

(1 citation statement)

References 22 publications

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“…For mixed convection heat transfer, Al-Sarkhi et al (2003), Giri and Das (2012), and Das and Giri (2014) studied numerically all the parametric variation effects such as clearance, spacing, height for a vertical fin array. Zhang et al (2015) numerically analyzed the variation of the ratio between the wavelength to the fin length and studied the effect of different attack angles for the serrated fins. Also, Ahmed et al (2016) numerically studied the ribbed flat plated fins and presented the optimized design for better thermal performance.…”

Section: Introductionmentioning

confidence: 99%

Thermo-Hydraulic Analysis of Slightly Inclined Finned Channel under Natural Convection

2022

JAFM

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The influence of slight inclination, 'α' (i.e., 10°, 15°, and 20°) of the channel comprised of shrouded vertical rectangular non-isothermal fin array has been computationally investigated. Simulations are performed to obtain the convective coefficient of heat transfer for the different dimensionless fin spacing (S * = 0.2, 0.3, 0.5), non-dimensional fin tip to shroud clearances (C * = 0.1, 0.2 and 0.3), Grashof numbers (Gr= 1.08×10 5 , 4.42×10 5 and 11.5×10 5 ), fin lengths (L= 0.25m and 0.5m) and fin heights (H= 0.025m, 0.04m, and 0.055m). Hydrodynamic behavior of the fluid indicates that a significant amount of flow reversal occurs near the entrance of the channel at very low inclination which vanishes with the increase in inclination. Further, at higher length, reverse flow is found to occur only in the clearance zone. An increase in the value of 'α' from 10° to 20°, results in enhancement of convective coefficient up to a maximum of 161%. An increase in the value of fin spacing from 0.2 to 0.5 results in the enhancement of the convective heat transfer coefficient. At α= 15° and 20°, the heat transfer is enhanced by 84.1% and 101.6%, respectively, while at α=10°, the same is reduced by 33.3%. At lower fin spacing (S * <0.3) increase in C * tends to reduce the efficiency. Further, the efficiency of the finite conductive fin is found to reduce by almost 8% with an increase in Grashof number.

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Section: Introductionmentioning

confidence: 99%

Thermo-Hydraulic Analysis of Slightly Inclined Finned Channel under Natural Convection

2022

JAFM

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

Wan

Liu

et al. 2022

Advcd Theory and Sims

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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.

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Numerical analysis and optimization on flow and heat transfer performance of HPD‐type perforated fins

Dai,

Wang,

Yang

et al. 2024

Can J Chem Eng

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In this paper, we determine the trends and weights of the structural parameters on the heat transfer, flow resistance and comprehensive performance of high pressure direction (HPD)‐type perforated fins using Taguchi method and analysis of variance (ANOVA). The findings underscore the fin height as the most pivotal element affecting comprehensive performance, with its contribution ratio of 42.2%. Ultimately, the highest j‐factor, the lowest f‐factor, and the maximum JF‐factor were obtained as the objective functions, yielding the three most optimal sets of parameters. The findings reveal a remarkable 89.7% reduction in the f‐factor of the optimized HPD‐type perforated fins, accompanied by a substantial 127% augmentation in the JF‐factor compared to the HPD‐type fins.

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Numerical analysis of thermal-hydraulic characteristics on serrated fins with different attack angles and wavelength to fin length ratio

Cited by 21 publications

References 22 publications

Thermo-Hydraulic Analysis of Slightly Inclined Finned Channel under Natural Convection

Thermo-Hydraulic Analysis of Slightly Inclined Finned Channel under Natural Convection

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

Numerical analysis and optimization on flow and heat transfer performance of HPD‐type perforated fins

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