Select Page

Numerical Study of the Entrance Effects in an Oscillatory Flow of a Standing-Wave Thermoacoustics

Journal of Advanced Research in Fluid Mechanics and Thermal Sciences
Volume 43 No. 1, March 2018, Pages 149-157

Siti Hajar Adni Mustaffa1, Fatimah Al-Zahrah Mohd Saat1,2,*, Ernie Mattokit1
1Faculty of Mechanical Engineering Universiti Teknikal Malaysia Melaka, Hang Tuah Jaya, 76100 Durian Tunggal, Melaka, Malaysia
2Centre of Advanced Research on Energy, Universiti Teknikal Malaysia Melaka, Hang Tuah Jaya, 76100 Durian Tunggal, Melaka, Malaysia
*Corresponding author: fatimah@utem.edu.my

KEYWORDS

Oscillatory flow, entrance region, turbulence, standing-wave, thermoacoustics

ABSTRACT

Entrance effect and formation of the vortex structure play a vital role in understanding the flow physics at the channel entry especially in oscillatory flow inside the channel between thermoacoustic stack plates. The aims of the current study are to investigate the effect of flow frequency on the structure of the vortex shedding at the end of the stack plates and also the effect of the vortex formation at the end of the plates associated with “entrance effect”. The methods used are CFD simulation with ANSYS FLUENT as a solver. The flow was solved using laminar model and two-equation Shear-Stress Transport (SST) k-? turbulence model. The “entrance effect” and vortex flow phenomena has been studied for two drive ratios, DR (defined as ratio of maximum pressure amplitude to mean pressure) which are 0.65% and 1.0% at two frequencies of 13.1 Hz and 23.1 Hz. The results shows that at higher frequency, the entrance length becomes shorter. This can be emphasized that flow frequency plays a significant role as it affected the entrance length and vortex formation and structure of the flow.

CITE THIS ARTICLE

MLA
Adni Mustaffa, Siti Hajar, et al. “Numerical Study of the Entrance Effects in an Oscillatory Flow of a Standing-Wave Thermoacoustics.” Journal of Advanced Research in Fluid Mechanics and Thermal Sciences 43.1 (2018): 149-157.

APA
Adni Mustaffa, S. H., Mohd Saat, F. A., & Mattokit, E. (2018). Numerical Study of the Entrance Effects in an Oscillatory Flow of a Standing-Wave Thermoacoustics. Journal of Advanced Research in Fluid Mechanics and Thermal Sciences, 43(1), 149-157.

Chicago
Adni Mustaffa, Siti Hajar, Fatimah Al-Zahrah Mohd Saat, and Ernie Mattokit. “Numerical Study of the Entrance Effects in an Oscillatory Flow of a Standing-Wave Thermoacoustics.” Journal of Advanced Research in Fluid Mechanics and Thermal Sciences 43, no. 1 (2018): 149-157.

Harvard
Adni Mustaffa, S.H., Mohd Saat, F.A. and Mattokit, E., 2018. Numerical Study of the Entrance Effects in an Oscillatory Flow of a Standing-Wave Thermoacoustics. Journal of Advanced Research in Fluid Mechanics and Thermal Sciences, 43(1), pp.149-157.

Vancouver
Adni Mustaffa, SH, Mohd Saat, FA, Mattokit, E. Numerical Study of the Entrance Effects in an Oscillatory Flow of a Standing-Wave Thermoacoustics. Journal of Advanced Research in Fluid Mechanics and Thermal Sciences. 2018;43(1):149-157.

REFERENCES

[1] Zolpakar, Nor Atiqah, Normah Mohd-Ghazali, and Mawahib Hassan El-Fawal. “Performance analysis of the standing wave thermoacoustic refrigerator: A review.” Renewable and Sustainable Energy Reviews 54 (2016): 626-634.
[2] Zhang, S., Z. H. Wu, R. D. Zhao, G. Y. Yu, W. Dai, and E. C. Luo. “Study on a basic unit of a double-acting thermoacoustic heat engine used for dish solar power.” Energy Conversion and Management 85 (2014): 718-726.
[3] Sharify, Esmatullah Maiwand, and Shinya Hasegawa. “Traveling-wave thermoacoustic refrigerator driven by a multistage traveling-wave thermoacoustic engine.” Applied Thermal Engineering 113 (2017): 791-795.
[4] Abdoulla-Latiwish, Kalid OA, Xiaoan Mao, and Artur J. Jaworski. ” Abdoulla-Latiwish, Kalid OA, Xiaoan Mao, and Artur J. Jaworski. “Thermoacoustic micro-electricity generator for rural dwellings in developing countries driven by waste heat from cooking activities.” Energy 134 (2017): 1107-1120.
[5] Mao, Xiaoan, and Artur J. Jaworski. “Application of particle image velocimetry measurement techniques to study turbulence characteristics of oscillatory flows around parallel-plate structures in thermoacoustic devices.” Measurement Science and Technology 21, no. 3 (2010): 035403.
[6] Mohd Saat, Fatimah AZ, and Artur J. Jaworski. “Numerical Predictions of Early Stage Turbulence in Oscillatory Flow across Parallel-Plate Heat Exchangers of a Thermoacoustic System.” Applied Sciences 7, no. 7 (2017): 673.
[7] Shi, Lei, Zhibin Yu, Artur J. Jaworski, and Abdulrahman S. Abduljalil. “Vortex shedding at the end of parallel-plate thermoacoustic stack in the oscillatory flow conditions.” World Academy of Science, Engineering and Technology 49 (2009).
[8] Mao, Xiaoan, Zhibin Yu, Artur J. Jaworski, and David Marx. “PIV studies of coherent structures generated at the end of a stack of parallel plates in a standing wave acoustic field.” Experiments in Fluids 45, no. 5 (2008): 833-846.
[9] Mohd Saat, Fatimah AZ, and Artur J. Jaworski. “The effect of temperature field on low amplitude oscillatory flow within a parallel-plate heat exchanger in a standing wave thermoacoustic system.” Applied Sciences 7, no. 4 (2017): 417.
[10] Shi, Lei, Zhibin Yu, and Artur J. Jaworski. “Application of laser-based instrumentation for measurement of timeresolved temperature and velocity fields in the thermoacoustic system.” International Journal of Thermal Sciences 49, no. 9 (2010): 1688-1701.
[11] Mohd Saat, Fatimah AZ, and Artur J. Jaworski. “Friction Factor Correlation for Regenerator Working in a Travelling-Wave Thermoacoustic System.” Applied Sciences 7, no. 3 (2017): 253.
[12] Matveev, Konstantin, Scott Backhaus, and Greg Swift. “On some nonlinear effects of heat transport in thermal buffer tubes.” In AIP Conference Proceedings, vol. 838, no. 1, pp. 371-378. AIP, 2006.
[13] Azwadi, CS Nor, and I. M. Adamu. “Turbulent force convective heat transfer of hybrid nano fluid in a circular channel with constant heat flux.” J. Adv. Res. Fluid Mech. Therm. Sci. 19, no. 1 (2016): 1-9.
[14] Abdulwahab, Mohammed Raad. “A numerical investigation of turbulent magnetic nanofluid flow inside square straight channel.” J. Adv. Res. Fluid Mech. Therm. Sci. 1, no. 1 (2014): 44-52.
[15] Yamanaka, G., H. Kikura, Y. Takeda, and M. Aritomi. “Flow measurement on oscillating pipe flow near the entrance using the UVP method.” Experiments in fluids 34, no. 3 (2003): 307-315.
[16] Jaworski, Artur J., Xiaoan Mao, Xuerui Mao, and Zhibin Yu. “Entrance effects in the channels of the parallel plate stack in oscillatory flow conditions.” Experimental Thermal and Fluid Science 33, no. 3 (2009): 495-502.
[17] Cengel, Yunus. Heat and mass transfer: fundamentals and applications. McGraw-Hill Higher Education, 2014.
[18] S. H. A. Mustaffa., F. A. Z. Mohd Sa’at, E. Mat Tokit. “Design of experimental test-rig to investigate turbulence in oscillatory flow used in thermoacoustics.” Proceeding of Postgraduate Symposium on Green Engineering and Technology (2016).
[19] Versteeg, Henk Kaarle, and Weeratunge Malalasekera. An introduction to computational fluid dynamics: the finite volume method. Pearson Education, 2007.
[20] Rott, Nikolaus. “Thermoacoustics.” In Advances in applied mechanics, vol. 20, pp. 135-175. Elsevier, 1980.