Numerical simulation of heat and fluid flow in basic pulse tube refrigerator

The working principle of refrigeration in basic pulse-tube refrigerators (BPTR) has been explained by the mechanism called surface heat pumping (SHP) that heat is conveyed from the cold end to the hot end of the pulse tube by the successive heat exchange between the working gas and the wall. In this study, a numerical simulation has been performed to clarify the effect of the wall in BPTRs by comparing the numerical results in two physical models; one is the model considering the heat exchange between the working gas and the wall (HE model), and the other is the model ignoring that (AW model). As a result, the importance in the effect of the wall was shown clearly. In addition, the mechanism of refrigeration other than the SHP was made clear in the AW model.

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Numerical Analysis of Heat and Fluid Flow in a Basic Pulse-Tube Refrigerator-Analysis on Heat Exchange between the Tube Wall and the Working Gas-

TEION KOGAKU (Journal of Cryogenics and Superconductivity Society of Japan) ◽

10.2221/jcsj.38.339 ◽

2003 ◽

Vol 38 (7) ◽

pp. 339-347

Author(s):

Takao KOSHIMIZU ◽

Hiromi KUBOTA ◽

Yasuyuki TAKATA ◽

Takehiro ITO

Keyword(s):

Fluid Flow ◽

Heat Exchange ◽

Numerical Analysis ◽

Tube Wall ◽

Pulse Tube ◽

Pulse Tube Refrigerator ◽

Heat And Fluid Flow

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Numerical Simulation of Heat Pumping in a Pulse Tube Refrigerator

ASME/JSME 2007 Thermal Engineering Heat Transfer Summer Conference, Volume 3 ◽

10.1115/ht2007-32729 ◽

2007 ◽

Author(s):

Takao Koshimizu ◽

Hiromi Kubota ◽

Yasuyuki Takata ◽

Takehiro Ito

Keyword(s):

Numerical Simulation ◽

Pulse Tube ◽

Pulse Tube Refrigerator ◽

Heat Quantity ◽

The Difference ◽

Regenerator Material ◽

Energy Equations ◽

Pulse Tube Refrigerators ◽

Heat And Fluid Flow ◽

Heat Pumping

Numerical simulation of heat and fluid flow in a basic and an orifice pulse tube refrigerator have been performed to visualize heat pumping generated in the regenerator and the pulse tube, and to clarify the difference in heat pumping caused by the phase difference between pressure and displacement of gas. Common components of the regenerator and the pulse tube are used in the basic and the orifice pulse tube refrigerator. The flow in the tube is assumed to be one-dimensional and compressible. As governing equations, the continuity, momentum and energy equations are used in this study. From the temperature and velocity field obtained as a result of the simulation, the relation between the displacement and the temperature change of gas elements is visually clarified, and consequently it is found that the characteristic that the temperatures of gas elements are nearly higher than those of the regenerator material or the pulse-tube wall during compression and lower during expansion is very important for the heat pumping in basic and orifice pulse tube refrigerators. Furthermore, the behavior of heat pumping in the basic and the orifice pulse tube refrigerator is illustrated by analyzing the relation between the displacement of gas elements and heat quantity transferred to the wall from the gas elements, and the difference in heat pumping between the basic and the orifice pulse tube refrigerator is made clear.

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