Abstract
A physical model for flow characteristics analysis of labyrinth-channel emitter is reconstructed by Reverse Engineering from an injection molded part, and both laminar flow and turbulence models are adopted to simulate the flow state under the condition of low Reynolds numbers. According to the distribution of separation and reattachment points, the onset of transition from laminar to turbulent flow in labyrinth channels occurs at a range of Re=250~300. Furthermore, a visualization system of the flow field inside the labyrinth experiments. The experiment of tracing particles verifies the calculated flow field distribution, and another experiment using dyeing liquor showed the critical Reynolds number characterizing the transition, which is reasonably consistent with numerical simulation results. The critical Reynolds number obtained shows the fact that the flow inside this emitter is turbulent under the pressures of 40~150 kPa.
Keywords
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
Download to read the full chapter text
Chapter PDF
References
A. Q. Mohammad, Y J Jang, H C Chen, . Flow and heat transfer in rotating two-pass rectangular channels(AR=2) by Reynolds stress turbulence model. International Journal of Heat and Mass Transfer, 2002, 45: 1823–1838
Fan Jichuan. Flow visualization technology in recently years. Beijing: National Defence Industry Press, 2002 (in Chinese)
Song Kang, Zhao Yulong, Jiang Zhuangde, . Laser profilometer. Optics and Precision Engineering, 2003, 11(3): 245–248 (in Chinese)
T. A. Rush, T. A. Newell, A. M. Jacobi. An experimental study of flow and heat transfer in sinusoidal wavy passages. International Journal of Heat and Mass Transfer, 1999, 42: 1541–1553
T. Nishimura, S. Murakami, S. Arakawa, . Flow observations and mass transfer characteristics in symmetrical wavy-walled channels at moderate Reynolds numbers for steady flow. International Journal of Heat and Mass Transfer, 1990, 33: 835–845
T. Nishimura, Y. Ohori, Y. Kawamura. Flow characteristics in a channel with symmetric wavy wall for steady flow. Journal of Chemical Engineering of JAPAN, 1984, 17: 466–471
Tao Wenquan. Numerical Heat Transfer (2nd edition). Xi'an: Xi'an Jiaotong University Press. 2001 (in Chinese)
Wang Ruihuan, Zhao Wanhua, Yang Laixia, . Experimental study of the water-saving emitter structure based on rapid prototyping. Journal of Xi'an Jiaotong University, 2003, 37: 542–545 (in Chinese)
Wei Qingsong, Shi Yusheng, Dong Wenchu, . Study on hydraulic performance of drip emitters by computational fluid dynamics. Agricultural Water Management, 2006, 84: 130–136
Yao Bin, Liu Zhifeng, Zhang Jianping. Study on the influence of channel length on dripper hydraulic performance. Water Saving Irrigation, 2003, (5): 38–39 (in Chinese)
Zhang Jun, Zhao Wanhua, Lu Bingheng . Numerical and experimental study on hydraulic performance of emitters with arc labyrinth channels. Computers and Electronics in Agriculture, 2007, 56:120–129
Author information
Authors and Affiliations
Corresponding author
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2009 Springer Science+Business Media, LLC
About this paper
Cite this paper
Zhao, W., Zhang, J., Tang, Y., Wei, Z., Lu, B. (2009). RESEARCH ON TRANSITIONAL FLOW CHARACTERISTICS OF LABYRINTHCHANNEL EMITTER. In: Li, D., Zhao, C. (eds) Computer and Computing Technologies in Agriculture II, Volume 2. CCTA 2008. IFIP Advances in Information and Communication Technology, vol 294. Springer, Boston, MA. https://doi.org/10.1007/978-1-4419-0211-5_11
Download citation
DOI: https://doi.org/10.1007/978-1-4419-0211-5_11
Published:
Publisher Name: Springer, Boston, MA
Print ISBN: 978-1-4419-0210-8
Online ISBN: 978-1-4419-0211-5
eBook Packages: Computer ScienceComputer Science (R0)