著者

竹村 文男 矢部 彰

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 B編 (ISSN:03875016)

巻号頁・発行日

vol.64, no.623, pp.2168-2173, 1998-07-25 (Released:2008-03-28)

参考文献数

15

被引用文献数

5 5

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The gas dis solution process of a spherical rising carbon dioxide bubble in water was investigated experimentally and numerically. We developed an experimental system that use a CCD camera coupled with a microscope to follow the rising bubble. By measuring the bubble size and the rising speed from the bubble motion data captured by a personal computer, we could precis ely estimate the drag coefficients and the Sherwood number for the dis solution of gas bubbles at Reynolds numbers below 100. The experimental results show that the drag coefficients of the carbon dioxide bubble in water show the same value of solid particle even when we use relatively clean water. We also numerically estimated Sherwood number for dis solution of gas bubbles in an infinite liquid by directly solving the Navier-Stokes equation and diffusion equation. The experimental and numerical results are in good agreement. Moreover, we compared the experimental results with a proposed equation for estimating the drag coefficients and Sherwood number and clarified the applicable region of the equation.

著者

竹村 文男 矢部 彰

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 B編 (ISSN:03875016)

巻号頁・発行日

vol.63, no.613, pp.2909-2914, 1997-09-25 (Released:2008-03-28)

参考文献数

10

被引用文献数

1 2

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Drag coefficients of a spherical rising gas bubble were estimated experimentally and numerically. We developed an experimental apparatus in which a CCD camera with a microscope follows the rising bubble and used it to precisely estimate the drag coefficients of the bubble below Reynolds number of 100 by measurement of the bubble size and the terminal velocity. We also estimated numerically drag coefficients of a gas bubble in an infinite liquid by directly solving a Navier-Stokes equation. The experimental results agree well with the numerical results. Moreover, we compared the experimental results with several proposed equations for estimating drag coefficients and determined the region of applicability of each equation. Finally, we proposed an equation for estimation of drag coefficient by correlating with experimental results.

著者

矢部 彰

出版者

公益財団法人 日本学術協力財団

雑誌

学術の動向 (ISSN:13423363)

巻号頁・発行日

vol.18, no.3, pp.3_30-3_35, 2013-03-01 (Released:2013-07-05)

参考文献数

1