理想萃取方程式? - 咖啡討論
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By Regina
at 2015-02-02T17:50
at 2015-02-02T17:50
Table of Contents
標題是小弟的構想啦
在這邊提出來給大家討論一下
是否可以建構一個模型 用理論的方式來推導萃取量?
我們都知道咖啡的萃取有許多變因
溫度 壓力 水量 顆粒 擾動等等
使用理想的假設條件 從簡單的方程式推廣到現實條件
在這邊先不討論壓力和豆種 單純從浸泡式的方法下手
E:萃取量 (單位先不標)
T(K):水溫
t(s):萃取時間
d(m):咖啡粉半徑尺寸
W(g):咖啡重
以下為假設:
1.在萃取過程中,咖啡粉是平均分佈於水中
2.咖啡粉體形狀為球體,且尺寸固定
3.萃取過程中水溫均保持一定
4.咖啡物質擴散速率符合steady state
5.擴散的速率和顆粒的表面積成正比
若以上假設成立
則:
E 會與〔W·e^(-Q/RT)·e^-k1t·d^-2〕成正比;Q.K1為常數
(因為有些熱力學或動力學的關係式,我讀的不是很好XD
,手邊一時找不到課本,有錯誤歡迎糾正!!)
若由這個關係來看 時間在一開始貢獻最多 越久越不顯著
一般在萃取時頂多由370K~350K
所以顆粒大小的影響會比溫度還明顯
當然!!一切都是在理想狀態!!
以上是我簡單的想法!!式子當中一定有錯誤XD 認真要抓的話一定是漏洞百出
但是概念應該不會差太多
如果真要探討的話 都可以發表論文了 哈哈
P.S.
這裡只討論萃取!!風味是另外一回事!!
--
在這邊提出來給大家討論一下
是否可以建構一個模型 用理論的方式來推導萃取量?
我們都知道咖啡的萃取有許多變因
溫度 壓力 水量 顆粒 擾動等等
使用理想的假設條件 從簡單的方程式推廣到現實條件
在這邊先不討論壓力和豆種 單純從浸泡式的方法下手
E:萃取量 (單位先不標)
T(K):水溫
t(s):萃取時間
d(m):咖啡粉半徑尺寸
W(g):咖啡重
以下為假設:
1.在萃取過程中,咖啡粉是平均分佈於水中
2.咖啡粉體形狀為球體,且尺寸固定
3.萃取過程中水溫均保持一定
4.咖啡物質擴散速率符合steady state
5.擴散的速率和顆粒的表面積成正比
若以上假設成立
則:
E 會與〔W·e^(-Q/RT)·e^-k1t·d^-2〕成正比;Q.K1為常數
(因為有些熱力學或動力學的關係式,我讀的不是很好XD
,手邊一時找不到課本,有錯誤歡迎糾正!!)
若由這個關係來看 時間在一開始貢獻最多 越久越不顯著
一般在萃取時頂多由370K~350K
所以顆粒大小的影響會比溫度還明顯
當然!!一切都是在理想狀態!!
以上是我簡單的想法!!式子當中一定有錯誤XD 認真要抓的話一定是漏洞百出
但是概念應該不會差太多
如果真要探討的話 都可以發表論文了 哈哈
P.S.
這裡只討論萃取!!風味是另外一回事!!
--
Tags:
咖啡
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