Numerical Simulation of Heat Pumping in a Pulse Tube Refrigerator

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.

Numerical Simulation of Heat and Fluid Flow in a Basic Pulse-Tube Refrigerator

2004 ◽  
Author(s):  
Takao Koshimizu ◽  
Hiromi Kubota ◽  
Yasuyuki Takata ◽  
Takehiro Ito
Keyword(s):  
Numerical Simulation ◽  
Fluid Flow ◽  
Heat Exchange ◽  
Surface Heat ◽  
Physical Models ◽  
The Other ◽  
Pulse Tube ◽  
Working Principle ◽  
Pulse Tube Refrigerators ◽  
Heat And Fluid Flow

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.

scholarly journals Numerical Simulation of Heat and Fluid Flow in Basic Pulse Tube Refrigerator

2003 ◽  
Vol 2003.7 (0) ◽  
pp. 99-100
Author(s):  
Takao KOSHIMIZU ◽  
Hiromi KUBOTA ◽  
Yasuyuki TAKATA ◽  
Takehiro ITO
Keyword(s):  
Numerical Simulation ◽  
Fluid Flow ◽  
Pulse Tube ◽  
Pulse Tube Refrigerator ◽  
Heat And Fluid Flow

D05 Numerical Simulation of Heat and Fluid Flow in Pulse Tube Refrigerator

2001 ◽  
Vol 2001.5 (0) ◽  
pp. 125-128
Author(s):  
Takao KOSHIMIZU ◽  
Hiromi KUBOTA ◽  
Yasuyuki TAKATA ◽  
Takehiro ITO
Keyword(s):  
Numerical Simulation ◽  
Fluid Flow ◽  
Pulse Tube ◽  
Pulse Tube Refrigerator ◽  
Heat And Fluid Flow

scholarly journals APPLICATION OF NOVEL REGENERATOR MATERIAL WITHIN A COAXIAL TWO-STAGE PULSE TUBE REFRIGERATOR

2008 ◽  
Author(s):  
T. Koettig ◽  
F. Richter ◽  
R. Nawrodt ◽  
A. Zimmer ◽  
C. Schwarz ◽  
...  
Keyword(s):  
Pulse Tube ◽  
Two Stage ◽  
Pulse Tube Refrigerator ◽  
Regenerator Material

Experimental and Numerical Characterization of an Orifice Type Cryogenic Pulse Tube Refrigerator

2011 ◽  
Author(s):  
Dion Savio Antao ◽  
Bakhtier Farouk
Keyword(s):  
Porous Media ◽  
Heat Exchanger ◽  
Fluid Dynamic ◽  
Travelling Wave ◽  
Cryogenic Cooling ◽  
Energy Separation ◽  
Pulse Tube ◽  
Cfd Model ◽  
Pulse Tube Refrigerator ◽  
Energy Equations

An orifice type pulse tube refrigerator (OPTR) was designed, built and operated to provide cryogenic cooling. The OTPR is a travelling wave thermoacoustic refrigerator that operates on a modified reverse Stirling cycle. We consider a system that is comprised of a pressure wave generator (a linear motor), an aftercooler heat-exchanger, a regenerator (comprising of a porous structure for energy separation), a pulse tube (in lieu of a displacer piston as found in Stirling refrigerators) with a cold and a warm heat-exchanger at its two ends, a needle-type orifice valve, an inertance tube and a buffer volume. The experimental characterization is done at various values of mean pressure of helium (∼ 0.35 MPa–2.2 MPa), amplitude of pressure oscillations, frequency of operation and size of orifice opening. A detailed time-dependent axisymmetric computational fluid dynamic (CFD) model of the OPTR is simulated to predict the performance of the OPTR. In the CFD model, the continuity, momentum and energy equations are solved for both the refrigerant gas (helium) and the porous media regions (the regenerator and the three heat-exchangers) in the OPTR. An accurate representation of heat transfer in the porous media is achieved by employing a thermal non-equilibrium model to couple the gas and solid (porous media) energy equations. In the future, a validated computational model can be used for system improvement and optimization.

Numerical simulation of a two-stage pulse tube refrigerator based on adiabatic model

2018 ◽  
Vol 47 (5) ◽  
pp. 705-717
Author(s):  
M.N. Thejaswini ◽  
V. Chandan ◽  
S. Kasthurirengan ◽  
K. Vasudevan
Keyword(s):  
Numerical Simulation ◽  
Pulse Tube ◽  
Two Stage ◽  
Pulse Tube Refrigerator
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