Multi-objective optimization of self-excited oscillation heat exchange tube based on multiple concepts

Cheng, Ziqiang; Wang, Zhaohui; Sun, Ximing; Fu, Ting

doi:10.1016/j.applthermaleng.2021.117414

Cited by 14 publications

(2 citation statements)

References 46 publications

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“…With the development of microfabrication technology, one of the effective methods of using microchannel high power intensive microelectronic devices with high surface-to-body ratio is widely used in advanced engineering fields such as microelectronics, energy, military nuclear energy, and biochemical industry [1][2][3][4]. According to microchannel convective heat transfer theory, the heat transfer performance of microchannel heat sink can be improved by increasing the heat transfer surface area of the channel or improving the heat transfer performance of the fluid, or use boiling heat transfer, such as nanofluids [5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

NSGA-II-Based Microchannel Structure Optimization Problem Study

Wang

2022

Scientific Programming

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A multiobjective genetic algorithm is used to optimize the structure of circular concave cavities and microchannels. The objective functions of thermal resistance and pumping power are constructed by the response plane approximation method according to the simulation results, and then a mathematical model of multiobjective genetic optimization with the structural parameters of microchannels as variables is established. The Pareto optimized solution sets of thermal resistance and pumping power are calculated by the nondominated ranking genetic algorithm NSGA-II, and the comprehensive heat transfer performance is evaluated by the enhanced heat transfer factor. The results show that the multivariate statistical coefficients R 2 of the thermal resistance and pumping power objective functions are 0.932 9 and 0.996 6, respectively, indicating the high accuracy of the fitted functions. The optimized channel structure ( e 1 = 0.036.8 mm , e 2 = 0.019.3 mm ) was used to achieve a more uniform temperature field distribution and better integrated heat transfer performance (enhanced heat transfer factor η = 1.23 ). When the thermal resistance is larger or the pump work is larger, the comprehensive heat transfer effect is not as good as the working condition when the thermal resistance and pump work are more uniform.

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Section: Introductionmentioning

confidence: 99%

NSGA-II-Based Microchannel Structure Optimization Problem Study

Wang

2022

Scientific Programming

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“…The outcomes revealed that the effective efficiency increases remarkably when applying the pulsating flow. This behavior can be attributed to that pulsating flow causes appearing a large number of vortices on the wall surface that, in turn, destroy the boundary layer and improves the turbulence of the main flow throughout increasing both the fluid mixing and the effect of the heat exchange surface, hence, enhancing the heat transfer rate [37]. Furthermore, the effect of pulsating flow increases at the large values of the air mass flow rates (i.e., at high Reynolds number values).…”

Section: Effective Efficiencymentioning

confidence: 99%

Thermal Performance of a Counter-Flow Double-Pass Solar Air Heater With The Steady and Pulsating Flow

Hussein¹,

Ahmed²,

Ekaid³

2022

ETJ

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 The tubular solar absorber is placed perpendicularly to the direction of airflow.  Pulsating flow increases the thermal performance by up to 15.2%  Thermal performance is directly proportional to the pulsating frequency.The present work studied the influence of pulsating flow as an active method on the thermal performance of a double-pass solar air heater with a tubular solar absorber. A ball valve has been used as a pulse generator mounted at the downstream flow of the solar air heater. The experiments were under indoor conditions with a constant heat flux of 1000 W/m 2 , and different air mass flow rates ranged from 0.01 to 0.03 kg/s. Moreover, the study covered three pulsation frequencies varied from 1 to 3 Hz. Based on the experimental outcomes, it can be observed that the heat transfer rate is enhanced by applying the pulsating flow, where it was found that the outlet temperature in the case of applying the pulsating flow rises by about 25.6 -27% as compared with the steady flow case. Moreover, pulsating flow offers a higher effective thermal performance by about 15.2 % at the maximum air mass flow rate compared with the steady flow. In addition, the findings pointed out that varying the pulsation frequency from 1 to 3 Hz produces an enhancement in heat transfer rate and in solar heater effective efficiency, where it was found that when changing the frequency from 1 to 3, the increment of effective efficiency ranged from 3.8 to 6.9 % depending on the air mass flow value.

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Characterization of vortex structures with self-excited oscillations based on Liutex-Omega vortex identification method

Wang

Fan

et al. 2023

J Hydrodyn

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Multi-objective optimization of self-excited oscillation heat exchange tube based on multiple concepts

Cited by 14 publications

References 46 publications

NSGA-II-Based Microchannel Structure Optimization Problem Study

NSGA-II-Based Microchannel Structure Optimization Problem Study

Thermal Performance of a Counter-Flow Double-Pass Solar Air Heater With The Steady and Pulsating Flow

Characterization of vortex structures with self-excited oscillations based on Liutex-Omega vortex identification method

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