Author
Meh Hassan Tijani
Other affiliations: Energy Research Centre of the Netherlands
Bio: Meh Hassan Tijani is an academic researcher from Eindhoven University of Technology. The author has contributed to research in topics: Thermoacoustics & Thermoacoustic heat engine. The author has an hindex of 6, co-authored 6 publications receiving 424 citations. Previous affiliations of Meh Hassan Tijani include Energy Research Centre of the Netherlands.
Papers
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TL;DR: The design strategy described in this paper is a guide for the design and development of thermoacoustic coolers and the optimization of the different parts of the refrigerator will be discussed.
165 citations
TL;DR: In this paper, the authors describe the construction and performance of a thermoacoustic refrigerator, which consists of three major parts: the refrigerator, the electronic apparatus necessary for the measurements and acquisition of the experimental data, and the gas-control panel which is used to fill and purge the system and to prepare gas mixtures.
100 citations
TL;DR: A quantitative experimental investigation into the effect of the pore dimensions on the performance of thermoacoustic devices is reported and it is concluded that a plate spacing in the stack of about three times the penetration depth should be optimal for thermoACoustic refrigeration.
Abstract: The characteristic pore dimension in the stack is an important parameter in the design of thermoacoustic refrigerators. A quantitative experimental investigation into the effect of the pore dimensions on the performance of thermoacoustic devices is reported. Parallel-plate stacks with a plate spacing varying between 0.15 and 0.7 mm are manufactured and measured. The performance measurements show that a plate spacing in the stack of 0.25 mm (2.5 deltak) is optimum for the cooling power. A spacing of 0.4 mm (4 deltak) leads to the lowest temperature. The optimum spacing for the performance is about 0.3 mm (3 deltak). It is concluded that a plate spacing in the stack of about three times the penetration depth should be optimal (3 deltak) for thermoacoustic refrigeration.
96 citations
TL;DR: The measurements show that the performance of the refrigerator improves as the Prandtl number decreases, and the lowest PrandTL number of 0.2, obtained with a mixture containing 30% xenon, leads to a coefficient of performance relative to Carnot which is 70% higher than with pure helium.
Abstract: From kinetic gas theory, it is known that the Prandtl number for hard-sphere monatomic gases is 2/3. Lower values can be realized using gas mixtures of heavy and light monatomic gases. Prandtl numbers varying between 0.2 and 0.67 are obtained by using gas mixtures of helium-argon, helium-krypton, and helium-xenon. This paper presents the results of an experimental investigation into the effect of Prandtl number on the performance of a thermoacoustic refrigerator using gas mixtures. The measurements show that the performance of the refrigerator improves as the Prandtl number decreases. The lowest Prandtl number of 0.2, obtained with a mixture containing 30% xenon, leads to a coefficient of performance relative to Carnot which is 70% higher than with pure helium.
64 citations
TL;DR: In this paper, a gas-spring system is introduced as a practical tool to shift the mechanical resonance frequency of a moving-coil speaker to match the acoustic frequency of the resonator.
Abstract: Moving-coil loudspeakers are appropriate drivers for thermoacoustic refrigeration. They are cheap, commercially available, compact, light, and can be adapted to meet specific requirements. This paper deals with the optimization of loudspeakers for thermoacoustic refrigeration. Using an electrical model that describes the refrigerator, it is concluded that the electroacoustic efficiency can be maximized over a wider frequency range by matching the mechanical resonance frequency of the driver to the acoustic resonance frequency of the resonator. A gas-spring system is introduced as a practical tool to shift the mechanical resonance frequency of the driver. An electroacoustic efficiency of 35% is obtained when the mechanical resonance frequency of the driver and the acoustic resonance frequency are equal. Additionally, the efficiency is constant over a relatively wide frequency range. This has advantages for thermoacoustic refrigeration. During cool-down, the operating acoustic frequency decreases so that the refrigerator will keep near the optimum performance.
22 citations
Cited by
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TL;DR: The design strategy described in this paper is a guide for the design and development of thermoacoustic coolers and the optimization of the different parts of the refrigerator will be discussed.
165 citations
TL;DR: In this article, the authors proposed a traveling-wave thermoacoustic electricity generator, which employs a looped-tube travelling-wave engine to convert thermal energy into acoustic power, an ultra-compliant alternator within the engine loop to extract and convert the engine acoustic power to electricity, and an acoustic stub matching technique to match the alternator to the engine.
158 citations
TL;DR: It is found that only a hybrid system can meet technical requirements imposed by modular design and based on the current state, phase change materials and thermoelectric devices are more likely to be part of this next generation thermal management system.
157 citations
TL;DR: In this paper, the authors describe the construction and performance of a thermoacoustic refrigerator, which consists of three major parts: the refrigerator, the electronic apparatus necessary for the measurements and acquisition of the experimental data, and the gas-control panel which is used to fill and purge the system and to prepare gas mixtures.
100 citations
TL;DR: An overview of the current research and experimental prototypes including typical thermo-acoustic prime movers, thermo acyclic refrigerators, thermodynamic driven pulse tube refrigerators and miniature thermoacoustic engines is presented in this article.
97 citations