TED-AJ03-227 THREE-DIMENSIONAL VELOCITY FIELD MEASUREMENT OF THE THERMOCAPILLARY CONVECTION IN THE HALF-ZONE LIQUID BRIDGE

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概要

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• A large number of experiments of thermocapillary flow in a half-zone (HZ) liquid bridge have been performed to date. Surface tension gradient owing to a non-uniform temperature distribution causes a fluid motion in the bridge. In the HZ method, a liquid bridge is suspended between hot and cold rods. It is widely known that the flow exhibits a transition from 2-D axisymmetric steady flow to 3-D non-axisymmetric 'oscillatory' one at a critical temperature difference between the both end surfaces. Not much research, however, has been conducted concerning the three-dimensional velocity measurement of the flow field in the bridge because of the significant size limitation under the normal gravity. The bridge-shape deformation due to the gravity cannot be avoided, and thus the bridge size is limited up to several millimeters. In addition, a curvature exists over the free surface, which prevents a precise measurement of the flow through the free surface. The present study aimed to measure the 3-D flow field in the small-size bridge of 5mm in diameter and of about 1mm in height by the particle tracking velocimetry (PTV). In order to apply 3-D PTV technique to reconstruct the small-size flow field, a small prism was placed above the transparent top rod, which enabled us to observe the flow simultaneously with two CCD cameras through the top-end surface (see Fig. A-1). The particles were traced in the successively captured 2D images by applying the triple pattern matching algorithm. The 3-D velocity field was reconstructed by the results of the particle tracking process with the camera parameters obtained by the camera calibration procedure conducted before/after the experiment. The 3-D structures of the steady and oscillatory flows were successfully reconstructed.[figure]

• 一般社団法人日本機械学会の論文

著者

• KAWAMURA Hiroshi

  Dept. of Med., Nippon Dent. Univ., Sch. of Dent. Tokyo

• Nishino Koichi

  Dept. Mech. Eng. Yokohama National University

• Ueno Ichiro

  Dept. Mech. Eng. Fac. Sci. & Tech. Science Univ. Of Tokyo

• Ueno Ichiro

  Dept. Mech. Eng. Tokyo University Of Science

• NISHIMURA MITSUMASA

  Dept. Mech. Eng., Tokyo University of Science

• Nishimura Mitsumasa

  Dept. Mech. Eng. Tokyo University Of Science

• Kawamura Hiroshi

  Dept. Mech. Eng. Fac. Sci. & Tech. Science Univ. Of Tokyo

• Kawamura Hiroshi

  Dept. Mech. Eng. Tokyo University Of Science

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• TED-AJ03-227 THREE-DIMENSIONAL VELOCITY FIELD MEASUREMENT OF THE THERMOCAPILLARY CONVECTION IN THE HALF-ZONE LIQUID BRIDGE

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