Abstract
This is the second part of a survey summarizing authors’ research over a period of two decades on enhancing impinging jet heat and/or mass transfer by periodic unsteadiness of nozzle flow rate. The first part, Tesař and Trávníček (2004 b), identified the reasons why pulsation does not always improve the transfer rate: the pulses do not reach up to the wall. The authors nevertheless demonstrate a transfer rate improvement, but in flows with inherent instability found in annular impinging jet. The excitation there causes a topological metamorphosis (reversal of flow character). Also in the extreme case of the synthetic (zero time-mean flow) jets the authors demonstrated a substantial improvement with the annular nozzle. The new approaches presented in the paper offer increased performance of drying and heating/cooling systems, in particular in microdevices with otherwise low or absent levels of natural jet turbulence.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Glezer, A. and Amitay, M., Synthetic Jets, Ann. Rev. of Fluid Mech., 34 (2002), 503.
Herman, C., The impact of flow oscillations on convective heat transfer, Ann. Rev. Heat Transfer 11 (2000), 495–562.
Lehmann, W., et. al., Giant Lateral Electrostriction in Ferroelectric Liquid-Crystalline Elastomers, Nature, 410 (2001), 447–450.
Tesař, V., Fluidic Jet-Type Rectifier: Experimental Study of Generated Output Pressure, Journal of Fluid Control/Fluidics Quarterly 14 (1983), Issue 4, U.S.A.
Tesař, V., Strhávací účinek střídavého vtoku a výtoku tryskou (Entrainment effect of alternating inflow and outflow from a nozzle — in Czech), Acta Polytechnica - Práce ÈVUT v Praze, (II, 1), (1991), Praha.
Tesař, V., Excited Axisymmetric Impinging Flows, Proc. of Conf. “Engineering Mechanics ’98” (Svratka), 4 (1998-5), 757–762, ISBN 80-85918-40-4.
Tesař V., Monostable Impinging-Jet Nozzles with Fluidic Control, Proc. of FLUCOME ’03, 7th Triennial Intern. Symp. on Fluid Control, Measurement and Visualization (Sorrento, Italy), (2003), Paper No. 288, ISBN 0-9533991-4-1.
Tesař, V. and Barker, J., Dominant Vortices in Impinging Jet Flows, Journ. of Visualization, 5–2 (2002), 121–128.
Tesař, V. and Peszynski, K., Computational and Anemometric Investigations of Impinging Flows Generated by an Annular Bistable Nozzle, Proc. of XI. International Conference (Bydgoszcz, Poland), (2001), 271–278, ISSN 0137-9682.
Tesař, V. and Peszynski, K., No-Moving-Part Fluidic Circulation Pumps, Proc. of XII ICMR Colloquium Recirculari (Bydgoszcz, Poland), (2003), 191–196, ISBN 83-88066-20-X.
Tesař, V. and Trávníček, Z., Pulsating and Synthetic Impinging Jets for High Heat and Mass Transfer Rates, 7th Biennial Conf. on Engineering Systems Design and Analysis (Manchester, U.K.), (2004), Paper ESDA 2004-58236.
Tesař, V. and Trávníček, Z., Increasing Heat and/or Mass Transfer Rates in Impinging Jets, Journ of Visualization, 8–2 (2005), 91–98.
Tesař, V. and Zhong, S., Efficiency of Synthetic Jet Generation, Transactions of the Aeronautical and Astronautical Society of the Republic of China, 35–1 (2003), 45–53.
Trávníček, Z. and Tesař, V., Annular Synthetic Jet Used for Impinging Flow Mass Transfer, International Journal of Heat and Mass Transfer, 46 (2003), Issue 17, 3291–3297.
Trávníček, Z. and Tesař, V., Annular Impinging Jet with Recirculation Zone Expanded by Acoustic Excitation, International Journal of Heat and Mass Transfer, 47 (2004), 2329–2341.
Trávníček, Z., Tesař, V. and Wang A.-B., Hybrid Synthetic Jet Actuators — Numerical and Experimental Studies, Sensors and Actuators, A: Physical, A 120 (2005).
Author information
Authors and Affiliations
Corresponding author
Additional information
Václav Tesař: He graduated in 1963 from ČVUT — Czech Technical University, Prague, Czech Republic. Received Ph. D from ČVUT in 1972. In 1985 Visiting Professor at Keio University, Yokohama, Japan, in 1992 Visiting Professor at Northern Illinois University, DeKalb, USA. From 1994 to 1998 Head of the Department of Fluid Mechanics and Thermodynamics, Faculty of Mechanical Engineering at ČVUT. Since 1999 at the Dept. of Chemical and Process Engineering, the Univ. of Sheffield, U. K. His research covers turbulence, jets and wall-jets and their application in fluidic no-moving-part flow control (named as the inventor on 195 Patents on fluidic devices). Author of 4 textbooks and over 270 papers.
Zdeněk Trávníček: He graduated in Mechanical Engineering from ČVUT Prague, Czech Republic. 1985 to 1995 employed at National Research Institute for Machine Design (SVÚSS) in Prague-Běchovice. Received Ph. D. from ČVUT in 1994gue. Since 1996, works at the Institute of Thermomechanics, Academy of Sciences of the Czech Republic. Stays at Inst. of Eng. Thermophysics, Kiev, Ukraine; 1990, National Taiwan University, Taipei, Taiwan (1998, and 2002), and at Heat Transfer Laboratory, Johns Hopkins University, Baltimore, USA, (2000/2001). His research covers convective heat and mass transfer from surfaces exposed to flows, mainly by impinging jets. Author of more than 70 papers.
Rights and permissions
About this article
Cite this article
Tesař, V., Trávníček, Z. Pulsating and synthetic impinging jets. J Vis 8, 201–208 (2005). https://doi.org/10.1007/BF03181497
Received:
Revised:
Issue Date:
DOI: https://doi.org/10.1007/BF03181497