間歇乾燥之稻穀薄層乾燥公式

A Thin-Layer Drying Equation for Paddy Rice in an Intermittent Drying Pattern

陳貽倫(Yi-Luen Chen)

《農業機械學刊》 5卷1期 (1996/03) Pp. 55-64

https://doi.org/10.30062/JAM.199603.0005

摘要

每個重50公克之稻穀樣品、在一內徑為15.6公分之乾燥筒內攤成一薄層，在樣品乾燥機上、以不同乾燥條件進行間歇乾燥。
稻穀品種：屏東潮州產梗稻
初含水率：34％,d.b.
通風速度：0.21 m/s
通風溫度：35,40,45,50,55,60℃…6階
通風濕度：17,24,31 g/kg of dry air…3階
每回乾燥時間：10分鐘
每回均化時間：50分鐘
共18處理，每處理2重複。
每一處理之乾燥曲線均具如右指數關係之傾向：MR=Aexp(-kt)；每一處理各有一組A,κ值，其實驗值與此指數式所預測值高度相關。如將全部乾燥數據適配”一”個指數式；應用複直線迴歸法求得式中之
A、κ值與溫濕度之關係式如下：A=1.026337-0.00453.T+0.002551.•H,r^2=0.823-k=0.001496-0.00026.T+0.000008•H,r^2=0.921
通風溫度對乾燥速度之影響是確定的；通風濕度之影響則在低溫時較為明顯。

關鍵字

稻穀 ； 乾燥 ； 薄層公式

並列摘要

Rough rice lots of 50 grams spread on the bottoms of drying sieves of 15.6cm inside diameter were being dried on a sample-dryer, using intermittent drying pattern, under different drying conditions.
Rice variety: Medium grain, grown in South Taiwan
Initial moisture content:34%,d.b.
Apparent drying air velocity:0.21 m/s
Drying air temperature:35,40,45,50,55,60℃
Drying air humidity:17,24,31g/kg dry air
Drying time for each round:10 min.
Tempering time for each round:50 min.
There were 18 different treatments with 2 repetitions for each treatment. For everyone of the treatment, the experiment drying curve was highly correlated to the following exponential equation: MR=A•exp(-kt)with a pair of A and k of its own. If all drying data were fitted to one single exponential equation and then using multiple linear regression to fit the model with temperatures and humidities, the following equations were obtained:
A=1.026337-0.00453.T+0.002551•H,r^2=0.823-k=0.001496-0.00026•T+0.000008•H,r^2=0.921
The effect of drying temperature on dring rate were obvious. The effect of the moisture in the drying air on drying rate was greater when the drying temperature was lower.

並列關鍵字

Paddy rice ； Drying ； Thin-layer equation