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.
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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.
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Tesař, V., Trávníček, Z. Pulsating and synthetic impinging jets. J Vis 8, 201–208 (2005). https://doi.org/10.1007/BF03181497
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DOI: https://doi.org/10.1007/BF03181497