CFD analysis of high frequency miniature pulse tube refrigerators for space applications with thermal non-equilibrium model

Ashwin, T.R.; Narasimham, G.S.V.L.; Jacob, S.

doi:10.1016/j.applthermaleng.2009.07.015

Cited by 53 publications

(21 citation statements)

References 15 publications

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“…One of the driving reasons for the increased attention of LTNE flows in porous media is the numerous amount of applications of this area in real life. For example, there are applications in tube refrigerators in space [1]; in nanofluid flows [2,3,4, ch. 8]; in fuel cells [5]; in resin flow, important in processing composite materials [6]; in nuclear reactor maintenance [7]; in heat exchangers [8]; in flows in microchannels [9]; in flow in porous metallic foams [10,11]; in textile transport [12]; and in convection in stellar atmospheres, cf.…”

Section: Introductionmentioning

confidence: 99%

Porous convection with local thermal non-equilibrium temperatures and with Cattaneo effects in the solid

Straughan

2013

Proc. R. Soc. A.

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There is increasing interest in convection in local thermal non-equilibrium (LTNE) porous media. This is where the solid skeleton and the fluid may have different temperatures. There is also increasing interest in thermal wave motion, especially at the microscale and nanoscale, and particularly in solids. Much of this work has been based on the famous model proposed by Carlo Cattaneo in 1948. In this paper, we develop a model for thermal convection in a fluid-saturated Darcy porous medium allowing the solid and fluid parts to be at different temperatures. However, we base our thermodynamics for the fluid on Fourier's law of heat conduction, whereas we allow the solid skeleton to transfer heat by means of the Cattaneo heat flux theory. This leads to a novel system of partial differential equations involving Darcy's law, a parabolic fluid temperature equation and effectively a hyperbolic solid skeleton temperature equation. This system leads to novel physics, and oscillatory convection is found, whereas for the standard LTNE Darcy model, this does not exist. We are also able to derive a rigorous nonlinear global stability theory, unlike work in thermal convection in other second sound systems in porous media.

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Section: Introductionmentioning

confidence: 99%

Porous convection with local thermal non-equilibrium temperatures and with Cattaneo effects in the solid

Straughan

2013

Proc. R. Soc. A.

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“…Pulse tube refrigerator (PTR) with no moving parts in cold region has the advantages over the Stirling refrigerator, resulting in high reliability, long life, and low vibration at the cold end [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Impact of coiled type inertance tube on performance of pulse tube refrigerator

Liu

Chen

Zhang

et al. 2016

Applied Thermal Engineering

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“…consisting of the single element (X1) can be defined as : [10] Where µA(x) is called MF of x in A. The degree of MF is expressed by a real number in the interval [0, 1].…”

Section: Fuzzy Inference Systemmentioning

confidence: 99%

“…Where 'v' is the piston head velocity. For regenerator porous media region the parameters were taken from Ashwin et al [10] which are inertial resistance (76090 m -1 ) and permeability (1.06 × 10 -10 m 2 ). Steel is chosen as a matrix material for regenerator.…”

Section: Details Of Modellingmentioning

confidence: 99%

“…One major assumption of this CFD analysis using FLUENT package is that the regenerator efficiency was assumed to be (100 %). This was studied by Ashwin et al [10] by considering a thermally non -equilibrium medium of porous region inside the regenerator. Cha et al [11] gave a computational fluid dynamics approach to solve the single stage iterance pulse tube refrigerator using well CFD solution software FLUENT and studied the multi-dimensional flow effects.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Analysis of Transport Phenomenon inside a Pulse Tube Refrigerator Coupled with Fuzzy Logic Controller

Rout¹,

Hussein²,

Sahoo³

et al. 2013

ujme

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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 are 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 variation 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.

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CFD analysis of high frequency miniature pulse tube refrigerators for space applications with thermal non-equilibrium model

Cited by 53 publications

References 15 publications

Porous convection with local thermal non-equilibrium temperatures and with Cattaneo effects in the solid

Porous convection with local thermal non-equilibrium temperatures and with Cattaneo effects in the solid

Impact of coiled type inertance tube on performance of pulse tube refrigerator

Numerical Analysis of Transport Phenomenon inside a Pulse Tube Refrigerator Coupled with Fuzzy Logic Controller

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