Newsletter 2019.3 Index
The Dreams of Flow Contest
Tomomi TERADA |
Abstract
We three, the group “Kikaichi♥” consists of third-year undergraduates of Hokkaido University, participated in the JSME 16th Dreams of Flow Contest held in Muroran, Hokkaido. We all are belong to the Department of Mechanical and Intelligent System Engineering and took a lecture of fluid dynamics. The contest was a chance to try our preliminary, but wide knowledge acquired in the lectures on mechanical engineering during last two years. The theme of the contest, “Active Control of Flow” suffered us so much because this was the first experience to proceed research by ourselves. We attempted to construct a model of a novel smoking room, “Kemumoji-kun”(Fig.1), which attracts smokers with its fascinating devices toward peaceful separate smokers from non-smokers. The model (Fig. 2), we finally constructed, possesses two floors (150 × 300 × 400 mm3) and is able to discharge smoke filling the smoking room with two fluid engineering techniques; thermal convection and air vibration. The former (Fig. 3) creates an upward flow using a lubber heater, and smoky air filling the first floor follows the flow and enters the second floor. The latter (Fig. 4) directly discharge incoming smoky air to outside as vortex rings with using air vibration generated by sound. At the contest, we demonstrated various sounds performed by a smartphone, musical instruments, human voice via a microphone, and so on. Throughout innumerable trials and errors, we finally won the first prize of the contest.
Key words
convection, vibration, vortex ring
Figures
Fig.1 “Kemumoji-kun”
Fig.2 Conceptual image of “Kemumoji-kun”
Fig3. Thermal Convection
Fig4. Air Vibration