Numerical analysis of heat transfer in turbulent reciprocating flow in Stirling engine heat exchanger

Authors

Abstract

Analysis of reciprocating flow is significant due to the different nature of this flow. An application of reciprocating flow is in heat exchanger of Stirling engine. The most of researches has been often considered to be laminar flow and incompressible, that it isn't appropriate for Stirling engines. In this study, a three-dimensional numerical simulation of reciprocating flow in Stirling engine heat exchanger in a wide of range non-dimensional flow displacement (20-100), high frequency of engine (30-130) and work pressure (5.25-11.5bar) were performed. The flow was considered compressible and turbulent. The characteristic of heat transfer in heat exchanger, the effect of oscillation frequency variation, working pressure and working fluid was studied. It was found that increasing the kinetic Reynolds number, working pressure and non-dimensional flow displacement increase heat transfer in engine's heat exchanger.In the ST500 Stirling engine was observed to increase of 80 percent of non-dimensional flow displacement, oscillation frequency and working pressure enhance 14, 9 and 20 percent the Nusselt number respectively. By replacing the hydrogen instead of helium, a 48 percent increase in heat transfer was observed.

Keywords

Main Subjects

References

[1] Richardson EG, Tyler E (1929) The transverse velocity gradient near the mouths of pipes. Proc Phys Soc Lond 42: 1-15.
[2] Simon TW, Seume JR (1988) A survey of oscillating flow in Stirling engine heat exchangers. NASA Contractor Report 182108.
[3] Uchida S (1956) The pulsating viscous flow superposed on the steady laminar motion of incompressible fluid in a circular pipe. ZAMP 7: 403-422.
[4] Iwabuchi M, Kanzaka M (1982) Experimental Investigation into Heat Transfer under the Periodically Reversing Flow Condition in a Heated Tube. J Mech Engineers 24(82): 135-139.
[5] Zhao T, Cheng P (1995) A numerical solution of laminar forced convection in a heated pipe subjected to reciprocating flow. Int J Heat Mass Tran 38(16): 3011-3022.
[6] Zhao T, Cheng P (1996) Experimental studies on the onset of turbulence and frictional losses in an oscillatory turbulent pipe flow. Int J Heat Fluid Fl 17: 356-362.
[7] Moschandreou T, Zamir M (1997) Heat transfer in a tube with pulsating flow and constant heat flux. Int J Heat Mass Tran 40: 2461-2466.
[8] Hemida H, Sabry M, Abdel-Rahim A (2002) heoretical analysis of heat transfer in laminar pulsating flow. Int J Heat Mass Tran 45: 1767-1780.
[9] Gul H, Akpinar E (2007) Investigation of heat transfer and exergy loss in oscillating circular pipes. Int Commun Heat Mass 34(1): 93-102.
[10] Xiao G et al (2014) Study on oscillating flow of moderate kinetic Reynolds numbers using complex velocity model and phase Doppler anemometer. J Appl Energy 130: 830-837.
[11] Wilcox DC (1994) Turbulence modeling for CFD. DCW Industries, Inc.
[12] هوشنگ مزدک و همکاران (1390) ارائه الگوی ریاضی دینامیکی-ترمودینامیکی موتور استرلینگ جهت بهبود بازده و توان تولیدی. فصلنامه تحقیقات موتور. 23: 72-85.
[13] Mabrouk MT, Kheiri A, Feidt M (1956) Displacer gap losses in beta and gamma Stirling engines. Energy 72: 135-144.
[14] Cheng CH, Ying J (2014) Numerical model for predicting thermodynamic cycle and thermal efficiency of a beta-type Stirling engine with rhombic-drive mechanism. Renew Energ 35(11): 2590-2601.
[15] Changzhao P, Zhou Y, and Wang J (2014) CFD study of heat transfer for oscillating flow in helically coiled tube heat-exchanger. Comput Chem Eng 69: 59-65.
[16] Kyung H, Mounir BI (1992) Laminar/turbulent oscillating flow in circular pipes. Int J Heat Fluid Fl 13(4).
[17] مهدی صنیعی نژاد (1388) مبانی جریان­های آشفته و مدل­سازی آن­ها، نشر دانش­نگار.
[18] Wang C, Zhang N (2005) Numerical analysis of heat transfer in pulsating turbulent flow in a pipe. Int J Heat Mass Tran 48: 3957-3970.
[19] Ismael JO, Cotton MA (1996) Calculations of wall shear stress in harmonically oscillated turbulent pipe flow using a low-Reynolds-number k–e model. J Fluid Eng-T ASME 118(1): 189-194.
[20] Launder BE, Spalding DB (1974) The Numerical Computation of Turbulent Flows. Comput Method Appl M 3: 269-289.
[21] Guo LJ et al (2002) Transient convective heat transfer of water flow in a tube under pressure drop type oscillations. Int J Heat Mass Tran 45: 533-542.
Journal of Solid and Fluid Mechanics
Volume 5, Issue 4 - Serial Number 4
January and February 2016
Pages 187-200

Files

Share

How to cite

Statistics