Numerical analysis on thermoacoustic prime mover

Zhang, Dongwei; Jiang, Erhui; Shen, Chao; Zhou, Junjie; Yang, Weiwei; He, Ya‐Ling

doi:10.1016/j.jsv.2019.114946

Cited by 9 publications

(2 citation statements)

References 35 publications

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“…In addition, the cost of consumptive materials can be reduced by replacing the stack of parallel plates by the converging stack with the same ratio. Zhang et al studied the impact of stack geometry parameters and pressure charge on the temperature gradient along the stack of thermoacoustic prime mover with various working gas [26]. The results shows that when the computational thickness is three times longer as the gas thermal penetration depth the optimal plate thickness is 33% of the plates width and lowest charge pressure in thermoacoustic engine leads to the increase of onset temperature along the stack.…”

Section: Introductionmentioning

confidence: 99%

Design optimization and CFD analysis of the dynamic behavior of a standing wave thermoacoustic engine with various geometry parameters and boundary conditions

Bouramdane

Bah

Alaoui

et al. 2023

Int. J. Air-Cond. Ref.

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Thermoacoustic devices are converters of thermal energy into acoustic energy and vice versa. Although these machines contain simple components, the design of these machines is very challenging. In order to predict the behavior and optimize the efficiency of a standing-wave thermoacoustic engine designed to drive a thermally driven thermoacoustic refrigerator, considering changes in geometrical parameters and operating conditions, two analogies have been presented in this paper. The first analogy is based on a CFD simulation carried out to investigate the influence of stack parameters, working gas and boundary conditions on the thermoacoustic process. The second analogy is performed by the use of an optimization algorithm based on the simplified linear thermoacoustic theory to design and optimize the parameters investigated by the CFD study. Stack of parallel plates of normalized stack center positions of 0.007 to 0.26, normalized stack lengths of 0.018 to 0.11, and several gaps and thicknesses of plates and working gases are used. The results from the algorithm give the ability to design any thermoacoustic engine with high efficiency by picking the appropriate parameters. Simulation results show that decreasing thickness and position of the plates gives a significant efficiency. However, there are optimum values for length of the stack and the gap between two plates. The material chosen for the construction of plates should have a low thermal conductivity and gases with higher ratios of specific heats and lower Prandtl numbers are well suitable for thermoacoustic systems.

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Section: Introductionmentioning

confidence: 99%

Design optimization and CFD analysis of the dynamic behavior of a standing wave thermoacoustic engine with various geometry parameters and boundary conditions

Bouramdane

Bah

Alaoui

et al. 2023

Int. J. Air-Cond. Ref.

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show abstract

“…In addition, the ultrasonic cavitation could accelerate the phase transition rate and then enhance the heat transfer performance. The acoustic energy converted from other energies, which are heat or electric energy 30‐33 . Thus, the heat transfer enhancement by ultrasonic cavitation achievesdrastic discussion, 34‐37 in which Zhao et al 35 introduced the ultrasonic effect in the PHP.…”

Section: Introductionmentioning

confidence: 99%

Effect of ultrasonic on the enhancement of heat transfer for pulsating heat pipe

Zhang

Jiang

et al. 2021

Int J Energy Res

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Summary The pulsating heat pipe (PHP) has become one of the most promising devices to dramatically remove heat for electronic devices. This work focuses on the experimental investigation of ultrasonic on the enhancement of heat transfer of PHP, and further discusses this effect at the different working fluids. The results indicate that the external region of PHP exhibits more intense oscillation motion of working fluids than that of internal‐region. The heat transfer performance enhanced assisted with the ultrasonic at the heating power of 5 to 20 W but deteriorated at 25 W. For details, the heat transfer coefficient (HTC) increased 72.6%, and the internal and external start‐up times reduced 57.8% and 2.2%, respectively. Furthermore, the numerous vapors confirm that the ultrasonic cavitation would effectively accelerate the phase transition. Finally, it also discusses the couple effect between the ultrasonic and different working fluids on heat transfer coefficient. The maximum HTC of 1.85 is obtained at the heating power of 15 W for the PHP charged with acetone. In addition, the trend of HTC of PHP filled with acetone shows much more stable assisted with ultrasonic varying from the heating power inputs. Highlights The thermal performance was revealed by internal and external region of PHP The directly enhanced method of ultrasonic cavitation was introduced The novel index of the heat transfer coefficient (HTC) was proposed The couple effect ultrasonic on the enhancement of heat transfer was discussed with different working fluids

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Nonlinear dynamics of thermoacoustic combustors

Zhao

2023

Thermoacoustic Combustion Instability Control

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Numerical analysis on thermoacoustic prime mover

Cited by 9 publications

References 35 publications

Design optimization and CFD analysis of the dynamic behavior of a standing wave thermoacoustic engine with various geometry parameters and boundary conditions

Design optimization and CFD analysis of the dynamic behavior of a standing wave thermoacoustic engine with various geometry parameters and boundary conditions

Effect of ultrasonic on the enhancement of heat transfer for pulsating heat pipe

Nonlinear dynamics of thermoacoustic combustors

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