Newsletter 2014.1 Index
Theme : "The Conference of Fluid Engineering Division"
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We participated in JSME 12th Dreams of Flow Contest at Kyushu University. Here, I summarized my tough process to reach the contest, my impression of participating in this contest and my work.
By chance, fortunately, I discovered an interesting phenomenon that is a beautiful starry sky created by bubbles. We used an acrylic tank with transparent bottom. Then the bubbles were generated on the liquid surface by using the washing bottle named “star generator”. After that we illuminated the bubbles from bottom of the tank by a smart phone’s light as light source. The mechanism of this work is so simple and you can also see the beautiful starry sky in your home.
The principle of this phenomenon is also simple. Bubbles play a role of lens and concentrate incident light from the bottom of the tank to the bubbles. . Fig.1 shows a beautiful starry sky created by “Fluid Planetarium”, where the tank is filled by coffee with sugar diluted with water. As you can see in Fig.1, there are several stars. Fig.2 shows the result with cleaning solution of contact lens diluted with water. This liquid provides more beautiful starry sky (Fig.2) than that with the coffee (Fig.1). Starry sky obtained with mixture of salad oil and water shows great difference (Fig. 3) against the others. The most suitable liquid for the “Fluid Planetarium”, we believe so, in our examinations is Japanese sake!! Fig. 4 shows the corresponding starry sky. We investigated various daily liquid, and we conducted that Japanese sake is the best for the “Fluid Planetarium”. Another attraction is a moment of star disappearance (i.e. break-up of bubbles). We can feel the mutability of the “Fluid Planetarium”.
We greatly appreciate for all persons who cooperate with us. I’m thankful for all members of executive committee who gave me this valuable opportunity.
Fluid Dynamics, Multi-phase Flow, Bubble, Dreams of Flow Contest
Fig.1ﾂ A photo of starry sky using coffee
Fig.2ﾂ A photo of starry sky using cleaning solutions of contact lens
Fig.3ﾂ Photos of starry sky using salad oil
Fig.4ﾂ A photo of starry sky using Japanese sake as the best liquid
for the “Fluid Planetarium”