![GA[伽利略數]](/img/e/1d7/nBnauM3XwEDMwczMyMDM2ATN0UTMyITNykTO0EDMwAjMwUzLzAzL1EzLt92YucmbvRWdo5Cd0FmLyE2LvoDc0RHa.jpg "GA[伽利略數]")
定義
粘性流體中表征作用力比值的無量綱數
物理意義
理解一
![GA[伽利略數]](/img/e/ae7/wZwpmLwAzM4QTN4ATO4EDN0UTMyITNykTO0EDMwAjMwUzLwkzLwEzLt92YucmbvRWdo5Cd0FmLyE2LvoDc0RHa.jpg)
GA[伽利略數]![GA[伽利略數]](/img/a/5df/wZwpmL0MTM5gzN2MzNwIDN0UTMyITNykTO0EDMwAjMwUzLzczLyEzLt92YucmbvRWdo5Cd0FmL0E2LvoDc0RHa.jpg)
GA[伽利略數]其中
![GA[伽利略數]](/img/9/ce6/wZwpmLyATN5UjM4QTOwADN0UTMyITNykTO0EDMwAjMwUzL0kzL1AzLt92YucmbvRWdo5Cd0FmL0E2LvoDc0RHa.jpg)
GA[伽利略數]重力加速度
![GA[伽利略數]](/img/9/d0d/wZwpmL0MTM2IzMxMTMzEDN0UTMyITNykTO0EDMwAjMwUzLzEzL0AzLt92YucmbvRWdo5Cd0FmLwE2LvoDc0RHa.jpg)
GA[伽利略數]為流體密度
![GA[伽利略數]](/img/0/588/wZwpmL3gDM3MDM4MDMwEDN0UTMyITNykTO0EDMwAjMwUzLzAzLzMzLt92YucmbvRWdo5Cd0FmL0E2LvoDc0RHa.jpg)
GA[伽利略數]為流體動力粘滯係數
![GA[伽利略數]](/img/9/616/wZwpmLzEzM0YTM4kTNwMDN0UTMyITNykTO0EDMwAjMwUzL5UzL4EzLt92YucmbvRWdo5Cd0FmLxE2LvoDc0RHa.jpg)
GA[伽利略數]為特徵尺度。
Ga為表征重力作用和粘滯作用的對比關係
理解二
在研究流體中固相顆粒運動的問題時，伽利略數可以理解為
![GA[伽利略數]](/img/e/a85/wZwpmL3ATN1kDOxUjNxIDN0UTMyITNykTO0EDMwAjMwUzL1YzL1MzLt92YucmbvRWdo5Cd0FmLyE2LvoDc0RHa.jpg)
GA[伽利略數]其中
GA[伽利略數]表示流體密度
![GA[伽利略數]](/img/0/cfa/wZwpmL3AjM4ATO1MzNwIDN0UTMyITNykTO0EDMwAjMwUzLzczL0UzLt92YucmbvRWdo5Cd0FmLzE2LvoDc0RHa.jpg)
GA[伽利略數]表示顆粒密度
![GA[伽利略數]](/img/5/017/wZwpmLxYzM2AzMxMTMzEDN0UTMyITNykTO0EDMwAjMwUzLzEzLyUzLt92YucmbvRWdo5Cd0FmLyE2LvoDc0RHa.jpg)
GA[伽利略數]表示顆粒粒徑
![GA[伽利略數]](/img/f/69e/wZwpmLyITM0ADNwMzMzIDN0UTMyITNykTO0EDMwAjMwUzLzMzL2gzLt92YucmbvRWdo5Cd0FmLwE2LvoDc0RHa.jpg)
GA[伽利略數]為顆粒在靜水中沉速
![GA[伽利略數]](/img/a/728/wZwpmL4QDO2IDN1IzM0IDN0UTMyITNykTO0EDMwAjMwUzLyMzL1czLt92YucmbvRWdo5Cd0FmLwE2LvoDc0RHa.jpg)
GA[伽利略數]表示以顆粒沉速為特徵速度的雷諾數
