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Investigation of Effective Parameters on a Thermal Load in a Thermo-Acoustic Refrigerator | ||
| AUT Journal of Mechanical Engineering | ||
| مقاله 6، دوره 1، شماره 1، شهریور 2017، صفحه 49-54 اصل مقاله (4.48 M) | ||
| نوع مقاله: Research Article | ||
| شناسه دیجیتال (DOI): 10.22060/mej.2016.782 | ||
| نویسندگان | ||
| A. Mohammadi؛ S. M. A. Alavi* | ||
| Mechanical Engineering Department, Mashhad Branch, Islamic Azad University, Mashhad, Iran | ||
| چکیده | ||
| This article aims to investigate the effects of various parameters on the thermal load. The governing equations include continuity and Navier-Stokes equations for the flow field and the energy equation for the temperature distribution in transient mode. Numerical simulation of the thermoacoustic refrigerator by taking the non-zero thickness of the plate stack into account, that is a conjugate heat transfer problem, in a form of 2D has been performed in FLUENT software. Real simulation of thermoacoustic refrigerators needs a consideration of both heat exchangers, whereas in most simulations one or both heat exchangers have been neglected. Results are influenced by the steady state. Input dynamic pressure should be adjusted according to the temperature of the heat exchanger. The results demonstrate the effect of the distance of the plates on the average thermal load suggesting that the distance between the plates should be four times of the thickness of the plates so that the device works properly. By increasing the distance of the plates thermal load decreases. This is mainly because of pressure amplitude reduction induced by an increase in the distance between the plates. | ||
تازه های تحقیق | ||
[1] G.W. Swift, Thermo-acoustic engines, J. Acoust. Soc., 84 (1998) 1146-1152. [2] G.W. Swift, Thermo-acoustics: a unifying perspective for some engines and refrigerators, Fifth draft, 2001. [3] J.R.O. N. Cao, G. W. Swift, Energy Flux Density in a Thermo-acoustic Couple, J. Acoust, 99 (1996). [4] D.M. H. Ishikawa, Numerical Investigations of Flow and Energy Fields near a Thermo-acoustic Couple, J. Acoust. Soc., 111 (2002) 831-839. [5] G.P. A. Piccolo, Estimation of heat transfer coefficients in oscillating flows: The thermoacoustic case, International Journal of Heat Mass Transfer, 49 (2006) 1631-1642. [6] R.A.F. S. H. Tasnim, Computation of the flow and thermal fields in a thermos-acoustic refrigerator, International Journal of Heat Mass Transfer, 37 (2010) 748-755. [7] A. Piccolo, Numerical computation for parallel plate thermo-acoustic heat exchangers in standing wave oscillatory flow, International Journal of Heat and Mass Transfer, 54 (2011) 4518– 4530. [8] A.K. A. Namdar, E. Roohi, Numerical Investigation of Thermo-acoustic Refrigerator at Weak and Large Amplitudes Considering Cooling Effect, Cryogenics, 67 (2014) 36-44. [9] B.P. Leonard, A Stable and Accurate Convective Modeling Procedure Based on Quadratic Upstream Interpolation, Comput. Method Appl. Mec. Eng., 23 (1979) 293–312. [10] R.I. Issa, Solution of the implicitly discretised fluid flow equations by operator splitting, J. Comput. Phys., 62 (1986) 40-65. [11] H.T. P. Merkli, Thermo-acoustic effects in a resonance tube, Journal of Fluid Mechanics, 70 (1975) 161-177. | ||
| کلیدواژه‌ها | ||
| Refrigerator؛ Thermo-acoustic؛ Distance؛ Plate stack؛ Thermal load | ||
| مراجع | ||
|
[1] G.W. Swift, Thermo-acoustic engines, J. Acoust. Soc., 84 (1998) 1146-1152.
[2] G.W. Swift, Thermo-acoustics: a unifying perspective for some engines and refrigerators, Fifth draft, 2001.
[3] J.R.O. N. Cao, G. W. Swift, Energy Flux Density in a Thermo-acoustic Couple, J. Acoust, 99 (1996).
[4] D.M. H. Ishikawa, Numerical Investigations of Flow and Energy Fields near a Thermo-acoustic Couple, J. Acoust. Soc., 111 (2002) 831-839.
[5] G.P. A. Piccolo, Estimation of heat transfer coefficients in oscillating flows: The thermoacoustic case, International Journal of Heat Mass Transfer, 49 (2006) 1631-1642.
[6] R.A.F. S. H. Tasnim, Computation of the flow and thermal fields in a thermos-acoustic refrigerator, International Journal of Heat Mass Transfer, 37 (2010) 748-755.
[7] A. Piccolo, Numerical computation for parallel plate thermo-acoustic heat exchangers in standing wave oscillatory flow, International Journal of Heat and Mass Transfer, 54 (2011) 4518– 4530.
[8] A.K. A. Namdar, E. Roohi, Numerical Investigation of Thermo-acoustic Refrigerator at Weak and Large Amplitudes Considering Cooling Effect, Cryogenics, 67 (2014) 36-44.
[9] B.P. Leonard, A Stable and Accurate Convective Modeling Procedure Based on Quadratic Upstream Interpolation, Comput. Method Appl. Mec. Eng., 23 (1979) 293–312.
[10] R.I. Issa, Solution of the implicitly discretised fluid flow equations by operator splitting, J. Comput. Phys., 62 (1986) 40-65.
[11] H.T. P. Merkli, Thermo-acoustic effects in a resonance tube, Journal of Fluid Mechanics, 70 (1975) 161-177. | ||
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