{"title":"PIV Investigation into the Evolution of Vortical Structures in the Zero Pressure Gradient Boundary Layer","authors":"Ishtiaq A. Chaudhry, Zia R. Tahir","volume":71,"journal":"International Journal of Mechanical and Mechatronics Engineering","pagesStart":2339,"pagesEnd":2343,"ISSN":"1307-6892","URL":"https:\/\/publications.waset.org\/pdf\/5520","abstract":"Experimental investigation has been carried out\ntowards understanding the complex fluid dynamics involved in the\ninteraction of vortical structures with zero pressure gradient boundary\nlayer. A laminar boundary layer is produced on the flat plate placed\nin the water flume and the synthetic jet actuator is deployed on top of\nthe plate at a definite distance from the leading edge. The synthetic\njet actuator has been designed in such a way that the to and fro\nmotion of the diaphragm is maneuvered at will by varying the\noperating parameters to produce the typical streamwise vortical\nstructures namely hairpin and tilted vortices. PIV measurements are\nmade on the streamwise plane normal to the plate to evaluate their\ninteraction with the near wall fluid.","references":"[1] Acarlar, M.S. and Smith, C. R.; A study of hairpin vortices in a laminar\nboundary layer, Part 2. Hairpin vortices generated by fluid injection;\nJournal of Fluid Mechanics, Vol. 175, 1987.\n[2] Glezer, A.; The formation of vortex rings; Phy. of Fluids, V. 31,9, 1988.\n[3] Guo, F and Zhong, S.; A PIV investigation of the characteristics of\nmicro-scale synthetic jets; The Aer. Journal, l. 111, No. 1122, 2007.\n[4] Ishtiaq A. Chaudhry, Shan Zhong: Understanding the interaction of\nsynthetic jet with the flat plate boundary layer; ICARME, Trivandrum,\nIndia, May 2012.\n[5] Jabbal, M. and Zhong, S.: The near wall effect of synthetic jets in a\nboundary layer; Int. J. of Heat and Fluid Flow, V 29, issue 1, 2008.\n[6] Tang, H; Performance modelling of synthetic jet actuators for flow\nseparation control; PhD thesis, School of Mechanical, Aerospace and\nCivil Engineering, University of Manchester, UK, 2006.\n[7] Zhou, J. Zhong, S. \"Coherent structures produced by the interaction\nbetween synthetic jets and a laminar boundary layer and their surface\nshear stress patterns\". Computers and Fluids. Vol. 39. Issue 8. 2010.","publisher":"World Academy of Science, Engineering and Technology","index":"Open Science Index 71, 2012"}