Multi-dimensional flow effects in pulse tube refrigerators

Cha, Jong-Ho; Ghiaasiaan, S. Mostafa; Desai, Prateen V.; Harvey, Jeremy P.; Kirkconnell, C. S.

doi:10.1016/j.cryogenics.2006.03.001

Cited by 75 publications

(54 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The sizes of all parts of the system are listed in Table 1. The details of the simulated system can be found in the publication of Cha et al [12].…”

Section: Simulation Modelmentioning

confidence: 99%

See 1 more Smart Citation

CFD analysis of thermodynamic cycles in a pulse tube refrigerator

et al. 2010

View full text Add to dashboard Cite

a b s t r a c tThe objectives of this paper are to study the thermodynamic cycles in an inertance tube pulse tube refrigerator (ITPTR) by means of CFD method. The simulation results show that gas parcels working in different parts of ITPTR undergo different thermodynamic cycles. The net effects of those thermodynamic cycles are pumping heat from the low temperature part to the high temperature part of the system. The simulation results also show that under different frequencies of piston movement, the gas parcels working in the same part of the system will undergo the same type of thermodynamic cycles. The simulated thermal cycles are compared with those thermodynamic analysis results from a reference. Comparisons show that both CFD simulations and theoretical analysis predict the same type of thermal cycles at the same location. However, only CFD simulation can give the quantitative results, while the thermodynamic analysis is still remaining in quality.

show abstract

“…The sizes of all parts of the system are listed in Table 1. The details of the simulated system can be found in the publication of Cha et al [12].…”

Section: Simulation Modelmentioning

confidence: 99%

“…A User Define Function (UDF) is written to track and guide the movement of the piston. The mass, momentum, and energy equations solved by Fluent for the working gas are [12,14] …”

Section: Simulation Modelmentioning

confidence: 99%

CFD analysis of thermodynamic cycles in a pulse tube refrigerator

et al. 2010

View full text Add to dashboard Cite

show abstract

“…Previous efforts to model pulse tube cryocoolers (PTCs) have been generally performed in 2-D using axisymmetry for computational efficiency. Cha [7] presented a method for system-level modeling using dynamic meshing to simulate a compressor and successfully simulated a no-load condition for a linear PTC. Taylor [8] presented a reduced model focused on the pulse tube component and its associated transitions to the regenerator and inertance tube.…”

Section: Previous Workmentioning

confidence: 99%

Investigation of gravitational effects in pulse tube cryocoolers using 3-D CFD

Mulcahey¹,

Conrad²,

Ghiaasiaan³

et al. 2014

AIP Conference Proceedings

View full text Add to dashboard Cite

Investigation of Gravitational Effects in Pulse TubeCryocoolers Using 3-D CFD Abstract. Stirling-type pulse tube cryocoolers (PTC) are often selected for cryogenic cooling applications for their robustness and mechanical simplicity, having no moving parts at the cold end of the cooler. Originally designed for space applications, increased terrestrial use in tactical applications as well as ground testing of space systems has revealed that some PTCs exhibit sensitivity to gravitational orientation, often losing significant cooling performance unless situated with the cold end pointing downward. Previous investigations have indicated that some coolers exhibit sensitivity while others do not; however, a reliable method of predicting the level of sensitivity during the design process has not been developed. We have utilized 3-D computational fluid dynamics (CFD) to predict the percent of cooling capacity lost as a result of off-axis operation. The computational model has been validated experimentally on a number of coolers to enhance confidence in the method used.

show abstract

“…The development of natural convection is governed by the Navier-Stokes equations for compressible fluid. The mass, momentum, energy and gas state equations for the working gas are ex-pressed as [15] …”

Section: Pacsmentioning

confidence: 99%

Suppression of Natural Convection in a Thermoacoustic Pulse Tube Refrigerator

Han¹,

Liu²

2013

Chinese Phys. Lett.

View full text Add to dashboard Cite

The effects of gravity on the efficiency of thermoacoustic engines are investigated theoretically and experimentally, especially for thermoacoustic pulse tube refrigerators. The significant effects of gravity are found to be due to the presence of natural convection in the thermoacoustic pulse tube when the hot side of the tube is lower than the cold side. This kind of natural convection influences and reduces the efficiency of the thermoacoustic working system. Thus, how to suppress this natural convection becomes important for increasing the efficiency of thermoacoustic engines. Unlike the method of inserting a silk screen in a pulse tube, the present study uses a numerical simulation method to research the natural convection in pulse tubes, and we try to change the shape of the pulse tube to suppress this convection.

show abstract

Multi-dimensional flow effects in pulse tube refrigerators

Cited by 75 publications

References 23 publications

CFD analysis of thermodynamic cycles in a pulse tube refrigerator

CFD analysis of thermodynamic cycles in a pulse tube refrigerator

Investigation of gravitational effects in pulse tube cryocoolers using 3-D CFD

Suppression of Natural Convection in a Thermoacoustic Pulse Tube Refrigerator

Contact Info

Product

Resources

About