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Development of Flow Visualization Device with Smoke Generator in Learning Wind Tunnel  

Lim, Chang-Su (Graduate School of Korea National University of Education)
Choi, Jun-Seop (Technology Dept. Korea National University of Education)
Publication Information
대한공업교육학회지 / v.32, no.2, 2007 , pp. 87-103 More about this Journal
Abstract
The purpose of this study was to develop of the smoke flow visualization device of learning wind tunnel, teaching-learning materials in order to demonstrate air-flow around the fluid-flow field qualitatively and understand the resistance concepts of fluid-flow in secondary school. The contents of this study were consisted of the development and experiment of smoke flow visualization for learning wind tunnel. The main results of this study were as follows: First, this developed teaching-learning material here will help students understand the fundamental physical phenomena related with the resistance of fluid and the various patterns of air-flow in the field of transportation technology. Second, flow visualization has shown the same tendency in both of theoretical and experimental patterns. Third, the airfoil model has the smallest wake region meaning resistance against air-flow of circular cylinder and square rod model. Forth, flow separation point at leading edge and wide wake region began to show under the angle of attack of airfoil model ${\alpha}$ is $20^{\circ}$. Fifth, the wake width of the flow field behind a golf ball with dimple became slightly narrower than that without dimple. Sixth, the developed device was made to apply the teaching and learning materials for the experiment and practice in order to increase students' interest and attitude.
Keywords
Learning Wind Tunnel; Flow Visualization; Fluid-Flow Field; Resistant model;
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