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題 名 | 氣流式乾燥裝置之特性研究 |
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作 者 | 陳俊明; 張世豐; 陳朝光; | 書刊名 | 農業工程學報 |
卷 期 | 32:3 1986.09[民75.09] |
頁 次 | 頁60-76 |
分類號 | 434.251 |
關鍵詞 | 氣流式; 乾燥; 裝置; |
語 文 | 中文(Chinese) |
中文摘要 | 本文係以實驗及理論分析氣流式乾燥裝置之各項熱傳特性。由實驗測得整個乾燥裝置之各項平均熱傳特性並與理論計算之各項熱傳特性平均值比較,結果甚為吻合。本實驗所得氣流式乾燥裝置之熱容量係數ha,最低2462 kcal/hr℃ m³,最高8388 kcal/hr℃ m³較一般乾燥裝置高出數十倍,故整個裝置所佔面積小,構造簡單。尤其對熱敏感性粉粒體材料之乾燥特別有效。氣流式乾燥裝置之各項熱傳特性沿乾燥管急遽降低,在整個乾燥過程中,大部分水份均在加速圈內蒸發,完成乾燥作用。 同時由本文之實驗,可證明Johnstone(2)所提出之公式Nu□=0.95×10¯⁴(R□)□, 400<(R□)□<1,300 在氣流式乾燥裝置內可適用於400<(R□)□<2,500。 |
英文摘要 | The purpose of the present investigation is to study the heat transfer characteristics of the flash dryer by experimental and theoretical analyses. The average heat transfer characteristics of the flash dryer for the experimental results are compared with those for the theoretical results and the agreement is satisfactory. The values of heat capacity ha for the flash dryer used in the present experiment are from 2462 to 8388 kcal/, which are tens times higher than those for the general types of dryer. Therefore, the total area of the dryer used in the present study is smaller than that of general types of dryer. Thus, the dryer used in the present study is an elaborate and simple one especially effective for the heat-sensitive powder material. The eat transfer characteristics decrease rapidly along the drying pipe. In the entire drying process, most of the moisture is vaporized in the accelerated region. Meanwhile, it is proved from the present experiment that the following equation presented by Johnstone Nu□=0.95×10¯⁴(R□)□, 400<(R□)□<1,300 can be used in the range 400<(R□)□<2,500 for the present flash dryer. |
本系統中英文摘要資訊取自各篇刊載內容。