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Abstract
This research article illustrates a numerical study of single stage coaxial as well as inline Inertance-Type Pulse Tube Refrigerator (ITPTR). In this present work a computational fluid dynamic (CFD) approach has been adopted for numerical simulation purpose. The detail analysis of cool down behaviour, heat transfer at the cold end and the pressure variation inside the whole system has been carried out by using the most powerful computational fluid dynamic software package FLUENT. A number of cases have been solved by changing the porosity of the regenerator from 0.5 to 0.9 while the rest of the considered parameter is remains unchanged. The operating frequency for all the studied cases is (34 Hz) while the other system dimensions and the boundary conditions are considered unchanged for all cases. The results show that the porosity value of (0.6) produces a better cooling effect on the cold end of the pulse tube refrigerator. The variations of the pressure inside the pulse tube refrigerator during the process are also analysed. In this work an attempt has been made to make a thermally non-equilibrium model applied numerically to the porous region by considering two different energy equations to the solid matrix and for the fluid inside the porous medium and the results are compared with the thermally equilibrium model. In fact, to get an optimum parameter experimentally is a very tedious for iterance pulse tube refrigerator job, so that the CFD approach gives a better solution which is the main purpose of the present work. In the next part the fuzzy logic approach is applied to optimize the different component parameters that affect the cooling performance of the ITPTR. The investigation is performed with different design parameters such as the length and diameter of pulse tube and regenerator given as an input to the fuzzy controller while the output from the controller is the cold end temperature. The predicted optimum results have been verified by performing the confirmation tests.
Highlights
In the history of cryogenics the invention of Pulse tube refrigerator was performed by Gifford and Logesworth [1] in the year of 1964 at the Syracuse University
Zhu et al [3] introduced a Double inlet Orifice Pulse Tube Refrigerator (DIOPTR) in which a by pass was directly connected to the reservoir inlet from the compressor outlet, where the surplus amount of fluid passed to the compressor and decreased the regenerator losses
The temperature drop contours inside the regenerator are shown in Fig.4.It is observed from the contours that the temperature at the cold end is (46.5 K)
Summary
In the history of cryogenics the invention of Pulse tube refrigerator was performed by Gifford and Logesworth [1] in the year of 1964 at the Syracuse University. The addition of small orifice caused an improvement in the phase between the velocity and temperature and as a result more enthalpy flows near the hot heat exchanger Such types of Refrigerator are known as an Orifice Type Pulse Tube Refrigerator (OPTR). Chen et al [9] performed a CFD analysis by using the commercial software FLUENT to study the multi-dimensional flow characteristics and cool down behaviour of pulse tube refrigerator. The main objective of the first section is to study the pressure fluctuation as well as the cool down behavior at cold end due to varying in the porosity inside the porous region It is reported by the use of CFD simulation of the governing equations with the help of FLUENT software package
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