Abstract
Temperature and velocity fields in unsteady non-penetrative turbulent thermal convection of a horizontal fluid layer are measured in horizontal and vertical planes simultaneously using the combined liquid-crystal thermometry and stereo particle image velocimetry (PIV) with high spatial and temporal resolution. The result shows the formation of convection pattern across the fluid layer, which originates from the spoke structure over the heated surface. The upward fluid motion is generated from the intersection of the bursting lines of the spoke structure, while the downward motion is induced by the low temperature fluid directing toward the center of the spoke structure. Thus, the large-scale convective motion is produced in the fluid layer through the motion of spoke structure. The POD analysis of the temperature and velocity eigenfunctions shows the existence of large-scale motion in the fluid layer, which supports the observed convection pattern near the heated boundary and in the middle of the fluid layer.
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Nobuyuki Fujisawa: After graduating from Tohoku University (Dr E. 1983), he joined Gunma University and worked as an associate professor since 1991. He has been a professor of Niigata University since 1997, and currently a President of Visualization Research Center at Niigata University. His current research interests are flow visualization, non-intrusive measurement of temperature and velocity in thermal flow and combusting flow, and mass transport phenomena of flow accelerated corrosion problems.
Masataka Watanabe: He received his M.Sc.(Eng.) in Mechanical Engineering in 2007 from Niigata University. Now, he works for FA and CNC, FANUC in Yamanashi prefecture, Japan.
Yuji Hashizume: He received M.Sc.(Eng.) in Mechanical Engineering in 2002 from Niigata University and Ph.D. in 2005 from Shinshu University. He worked at Graduate School of Niigata University as a postdoctoral fellow. Currently, he works in KGT Inc. His research interests are experimental flow visualization, image processing, image measurement for application to thermal flow phenomenon.
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Fujisawa, N., Watanabe, M. & Hashizume, Y. Visualization of turbulence structure in unsteady non-penetrative thermal convection using liquid crystal thermometry and stereo velocimetry. J Vis 11, 173–180 (2008). https://doi.org/10.1007/BF03181932
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DOI: https://doi.org/10.1007/BF03181932