Performance analysis of a micro-scale pulse tube cryocooler based on optical fiber regenerator

Jin, Tao; Huang, Junye; Tang, Ke; Wu, Mei

doi:10.1016/j.cryogenics.2013.02.002

Cited by 2 publications

(1 citation statement)

References 11 publications

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“…With the rapid development of microelectromechanical systems (MEMS) and microflow devices (MFD) in the recent decades, the accurate predictions of fluid dynamics and heat transfer phenomena of microfluids are of great significance in the design, manufacture and operation of these systems. For example, a micro-scale pulse tube cryocooler (PTC) based on holey optical fibres has been proposed and modelled (Jin et al 2013). The holey fibre used as flow channel was described as the non-metal pipe bundle and introduced as the regenerator (the core device of thermoacoustic related machines) for PTCs.…”

Section: Introductionmentioning

confidence: 99%

An experiment-based comparative investigation of correlations for microtube gas flow

Tang

Huang

Jin

et al. 2015

Sadhana

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An experimental system was built to measure the gas (nitrogen and helium) flow characteristics in circular microchannels with diameters of 50, 20 and 5 μm. The Reynolds number of the flow was controlled in the large range of 15 to 2550. The highest Mach number could reach a magnitude of 0.625 and the highest Knudsen number was over 0.021. Four available empirical correlations were comparatively studied, in terms of the influence from compressibility and rarefaction. The accuracy of each correlation was investigated, and qualitative explanations were given according to the essence of fluid dynamics. The compressibility is found to be the dominant parameter in the experiments carried out. The results obtained by gas flow in holey optical fibres are helpful for the design of micro-scale pulse tube cryocoolers.

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Section: Introductionmentioning

confidence: 99%

An experiment-based comparative investigation of correlations for microtube gas flow

Tang

Huang

Jin

et al. 2015

Sadhana

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Study on vorticity diffusion laws under oscillating flow and its influences on dissipation loss

et al. 2020

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In this paper, the vorticity-stream function method is proposed to study the incompressible oscillating flow in the channel of Stirling regenerators. The vorticity field and velocity field in the channels of the parallel-plate regenerator are investigated. The plate spacing and oscillating frequency and kinematic viscosity of the working medium are unified as a dimensionless number e. The results showed that when e is ∼7, the “velocity overshoot” phenomenon occurs in the flow field, and this phenomenon becomes more evident with the increase of e and it gradually approaches the wall of the channel. The phase relationship between the pressure drop and the flow rate was obtained; the results showed that the phase of the flow rate lags behind the pressure drop, and the phase difference is influenced by spacing, frequency, and kinematic viscosity, with the maximal phase difference being 90°. The viscous dissipation loss in the channel was obtained based on the characteristic relationship between the cumulative flow and the pressure drop, and the wasted power of helium crossing a single channel was calculated to be less than 50 W when the frequency is no more than 100 Hz and the plate spacing is greater than 0.5 mm (given a swept volume of 500 ml). The results obtained in this paper verified the application of the vorticity-stream function method in oscillating flows, and the advantage of low resistance of helium over nitrogen was theoretically demonstrated in the relatively high frequency range.

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Performance analysis of a micro-scale pulse tube cryocooler based on optical fiber regenerator

Cited by 2 publications

References 11 publications

An experiment-based comparative investigation of correlations for microtube gas flow

An experiment-based comparative investigation of correlations for microtube gas flow

Study on vorticity diffusion laws under oscillating flow and its influences on dissipation loss

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