塵捲風的演示與分析－利用燭火煙霧與加熱的香灰水

Demonstration and Analysis of Dust Devil-Using Candle Smoke and Heated Ash Water

馮志龍(Chih-Lung Feng) ； 林錫暉(Hsi-Hui Lin) ； 林錫昭(His-Chao Lin) ； 馮兆筠(Chao-Yun Feng) ； 馮兆薇(Chao-Wei Feng)

《物理教育學刊》 18卷2期 (2017/12) Pp. 69-81

https://doi.org/10.6212/CPE.2017.1802.05

摘要

塵捲風現象屬於一種大氣柱狀旋轉運動，常出現於地表溫度較高區域，甚至火星表面亦曾發生。這種旋轉怪風外型近似龍捲風，但其尺度小且形成於晴空高溫環境中，故非常適合實驗演示探究。然而，過去相關的實驗演示大多以人工強迫對流為主，設備較昂貴且難以呈現溫度變化。因此，本文提出一個簡單有趣的實驗演示設計，利用燭火與水熱流裝置的自然熱對流方式演示塵捲風現象，並進行溫度量測分析。藉由三維空間溫度分佈，我們可解析塵捲風的熱柱機制。

關鍵字

自然熱對流 ； 塵捲風 ； 演示實驗 ； 熱柱

並列摘要

Dust devil is a rotating column of air. It occurs frequently in the hot area of Earth’s surface and even appears on Mars. The shape of dust devil looks like tornado, whose scale is small and can be formed in clear weather and high temperature environment. Thus, it is very suitable for experiment demonstration. However, past demonstration experiments associated with dust devil show that most experiments rely on forced convection, whereas their equipment is more expensive and the temperature variation is not obvious. Therefore, we present a simple and interesting demonstration design. It uses free heat convection of candle flame and heat flow device to demonstrate the phenomenon of dust devil and to perform the measurement of temperature. Through the three-dimensional temperature distribution, we can analyze the thermal plume mechanism of dust devil.

並列關鍵字

free heat convection ； dust devil ； demonstration experiment ； thermal plume