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A Numerical Simulation Method of a Two-Stage G-M Refrigerator and Comparison with Experiment

  • L. Wang
  • X. D. Xu
  • L. Zhang
Part of the Advances in Cryogenic Engineering book series (ACRE, volume 43)

Abstract

An improved numerical model and calculation method to simulate the dynamic process of a two-stage G-M refrigerator has been developed in this paper. A variety of factors, such as variable properties of regenerator materials and helium, existence of helium in a void space of a regenerator, were taken into account in the model. It can predict the distributions of temperature and mass flow, respectively with time, in the first and second stage regenerators, the regenerator efficiency and refrigeration capacity. Some analyses are made to study the effects of some parameters on refrigerator performance. The values predicted by computing agree with experimental results. The numerical method can provide useful information for the design of a high efficiency refrigerator.

Keywords

Heat Transfer Coefficient Friction Factor Stage Regenerator Crank Angle Convergent Nozzle 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Nomenclature

A

Heat transfer area

C

Volumetric specific heat

Dh

Equivalent diameter

f

Resistance factor

h

Specific enthalpy of fluid

K

Isolation heat index

m

Mass of control volume

Mass flow rate

P

Pressure

PH

Inlet high pressure

PL

Outlet low pressure

V

Volume

x

Coordinate of flow direction

Greek letters

α

Heat transfer coefficient

θ

Crank angle

λ

Friction factor

μ

Mass flow coefficient

ρ

Density

Subscripts

Q

Heat exchange with surroundings

S

Displacer movement distance

T

Temperature

t

Time

u

Gas flow velocity

f

Boundary of control volume

i

The i-th control volume

w

Matrix or wall of control volume

0

Nozzle inlet position

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References

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Copyright information

© Springer Science+Business Media New York 1998

Authors and Affiliations

  • L. Wang
    • 1
  • X. D. Xu
    • 1
  • L. Zhang
    • 1
  1. 1.Cryogenic LaboratoryChinese Academy of SciencesBeijingChina

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