Plenary Lecture

A Practice on the Signal Processing in a Time-Dependent Flow Measurement Chain through a Research Focusing on the Passage from Laminar to Turbulent Regime

Professor Melda Özdinç Çarpinlioğlu
Department of Mechanical Engineering
Faculty of Engineering
University of Gaziantep
E-mail: melda@gantep.edu.tr

Abstract: The physical mechanism and the determination of the onset of transition to turbulence in time dependent - periodic pipe flows have considerable difficulty due to the time dependency nature of the transition process itself. A comprehensive review of the previous experimental studies on the manner is presented to determine the relevant flow parameters and their critical ranges , the details of the measurement and data acquisition systems and the proposed methodologies . As an outcome of the review an experimental research devised is presented with its hardware and software for the data accumulation, processing and the graphical presentation of the major output flow parameters . Sinusoidal-pulsatile air flow in a pipeline was generated and controlled to investigate the interactive influences of oscillation frequency, f and velocity amplitude ratio, in the intermediate and inertia dominant regions since transitional characteristics of quasi-steady region are well defined. The sensitivity of the produced pulsatile flow , the ranges of the test cases focusing on the detection method of transition to turbulence are discussed in terms of the sample measurements of local cross-sectional velocity profiles, instantaneous velocity and pressure waveforms with an emphasis on the signal processing and uncertainty analysis through the presentation of the devised software program, named as TDFC.vi prepared in LabView 2009SP1 environment.

Brief Biography of the Speaker: Melda Özdinç Çarpınlıoğlu was born in Gaziantep, Turkey. She received B.Sc., M.Sc. and Ph.D. degrees in Mechanical Engineering from Middle East Technical University METU –Turkey in 1983, 1986 and 1992. She worked as a Research Assistant in 1983-1986 at METU, as an Instructor in 1987-1992 at University of Gaziantep-Turkey . She worked as an Assistant Professor and an Associate Professor in 1992-1997 and 1997-2003 at University of Gaziantep. She has been working as a Professor at University of Gaziantep since 2003. She was the Chairman of the Mechanical Engineering Department and Dean of the Faculty of Engineering in the periods of 1998-2007 and 2006-2009 at University of Gaziantep.
Her main research interests are Boundary Layer Flow, Boundary Layer Transition, Two-Phase Flow Fields, Unsteady-Pulsatile Flow Dynamics, HVAC Systems, Flow Dynamics in Packed Beds, Flow through Collapsible Tubes, Flow Measurement - Calibration ,Flowmeters, and Thermodynamic Analysis. She has several research articles and completed a variety of experimental research projects. She has been directing M.Sc. and Ph.D. studies in her research fields. She has been the acting head of Thermodynamics Branch of Science in department of Mechanical Engineering since 2004.

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