ass日本风韵熟妇pics男人扒开女人屁屁桶到爽|扒开胸露出奶头亲吻视频|邻居少妇的诱惑|人人妻在线播放|日日摸夜夜摸狠狠摸婷婷|制服 丝袜 人妻|激情熟妇中文字幕|看黄色欧美特一级|日本av人妻系列|高潮对白av,丰满岳妇乱熟妇之荡,日本丰满熟妇乱又伦,日韩欧美一区二区三区在线

直流高壓電場(chǎng)中枸杞的干燥特性與數(shù)學(xué)模型研究
CSTR:
作者:
作者單位:

作者簡(jiǎn)介:

通訊作者:

中圖分類號(hào):

基金項(xiàng)目:

國(guó)家自然科學(xué)基金項(xiàng)目(51467015)和內(nèi)蒙古工業(yè)大學(xué)基金項(xiàng)目(ZD201311)


Drying Characteristics and Mathematical Models of Chinese Wolfberry in DC High Voltage Electric Field
Author:
Affiliation:

Fund Project:

  • 摘要
  • |
  • 圖/表
  • |
  • 訪問統(tǒng)計(jì)
  • |
  • 參考文獻(xiàn)
  • |
  • 相似文獻(xiàn)
  • |
  • 引證文獻(xiàn)
  • |
  • 資源附件
  • |
  • 文章評(píng)論
    摘要:

    以枸杞為對(duì)象,研究其在相同溫度和濕度、不同強(qiáng)度直流高壓電場(chǎng)下的干燥特性,;檢測(cè)干燥后枸杞的收縮率,、復(fù)水率;測(cè)量高壓電場(chǎng)和干燥箱干燥后枸杞內(nèi)部多糖和維生素C含量,;計(jì)算了舍伍德數(shù),、傳質(zhì)增強(qiáng)因子以及水分有效擴(kuò)散系數(shù);采用10種常用的薄層物料干燥數(shù)學(xué)模型和3個(gè)統(tǒng)計(jì)參數(shù)對(duì)干燥數(shù)據(jù)進(jìn)行了模擬和比較,。結(jié)果表明:在直流高壓電場(chǎng)下枸杞的干燥速率明顯比對(duì)照組的干燥速率大,,在同一電壓下枸杞的干燥速率隨著干燥時(shí)間的延長(zhǎng)逐漸減小,枸杞的干燥速率隨著電壓的提高而增加,,單位能耗也隨著電壓的增加而增加,。在直流高壓電場(chǎng)下枸杞的復(fù)水率比對(duì)照組的復(fù)水率高,,單因素方差分析表明,在直流高壓電場(chǎng)下枸杞的復(fù)水率與對(duì)照組的復(fù)水率之間存在顯著性差異,,但收縮率之間不存在顯著性差異,。高壓電場(chǎng)干燥比干燥箱干燥更好地保存了枸杞內(nèi)部的營(yíng)養(yǎng)成分。傳質(zhì)增強(qiáng)因子隨著電壓的增加呈線性增長(zhǎng)關(guān)系,,枸杞內(nèi)部水分有效擴(kuò)散系數(shù)隨著電壓的增加而增加,。通過統(tǒng)計(jì)參數(shù)分析,發(fā)現(xiàn)所選的10個(gè)數(shù)學(xué)模型都可以用來描述枸杞在直流高壓電場(chǎng)下的干燥過程,,其中Midill and Kucuk模型最適合用來描述直流高壓電場(chǎng)中枸杞干燥曲線的變化規(guī)律,。高壓電場(chǎng)影響枸杞表面的微觀結(jié)構(gòu)。這為優(yōu)化直流高壓電場(chǎng)干燥枸杞工藝,,提高干燥效率和發(fā)展枸杞干燥技術(shù)提供了線索和實(shí)踐指導(dǎo),。

    Abstract:

    Aiming to explore the new drying technology of Chinese wolfberry, improve the quality of dried Chinese wolfberry, and find suitable mathematical model, the drying experiments were carried out for Chinese wolfberry fruits with a multiple needle-to plate-electrode at 0kV, 22kV, 28kV, 34kV, 40kV and 45kV at the same temperature and humidity in DC high voltage electric field. The shrinkage rate, rehydration rate, polysaccharides and vitamin C content of the dried wolfberry fruits were measured. The mass transfer enhancement factor, the effective moisture diffusion coefficient (Deff) and the specific energy consumption were also calculated. Ten mathematical models were then applied to simulate drying curves based on three statistical parameters. The results showed that the drying rate of Chinese wolfberry fruits in the DC high voltage electric field was higher than that of the control. Under the same voltage, the drying rate of the Chinese wolfberry was gradually changed with the prolonging of drying time. The drying rate and specific energy consumption were increased with the increase of voltage. By ANOVA, the results showed that Chinese wolfberry fruits in the DC high voltage electric field had a significant effect on rehydration rate compared with control (p<0.05), but there were no significant differences in shrinkage rate of dried Chinese wolfberry fruits (p>0.05). DC high voltage electric field drying could keep more polysaccharides and vitamin C content compared with oven drying. The mass transfer enhancement factor was heightened with the increase of voltage, and the effective moisture diffusion coefficient (Deff) values were increased with the increase of voltage. It was clear that all ten mathematical models could satisfactorily describe drying curves of Chinese wolfberry fruits treated by DC high voltage electric field. From the statistical result, the Midill and Kucuk model was selected as the best model to represent the drying characteristics of Chinese wolfberry fruits in the DC high voltage electric field. Microstructure detection indicated that the microstructure of Chinese wolfberry fruits was changed in the DC high voltage electric field. Those results may provide some clues and practical guidance for optimizing the process of drying Chinese wolfberry fruits in DC high voltage electric field drying system, improving the drying efficiency and promoting the development of Chinese wolfberry fruits drying technology.

    參考文獻(xiàn)
    相似文獻(xiàn)
    引證文獻(xiàn)
引用本文

丁昌江,楊茂生.直流高壓電場(chǎng)中枸杞的干燥特性與數(shù)學(xué)模型研究[J].農(nóng)業(yè)機(jī)械學(xué)報(bào),2017,48(6):302-311. DING Changjiang, YANG Maosheng. Drying Characteristics and Mathematical Models of Chinese Wolfberry in DC High Voltage Electric Field[J]. Transactions of the Chinese Society for Agricultural Machinery,2017,48(6):302-311.

復(fù)制
分享
文章指標(biāo)
  • 點(diǎn)擊次數(shù):
  • 下載次數(shù):
  • HTML閱讀次數(shù):
  • 引用次數(shù):
歷史
  • 收稿日期:2016-10-09
  • 最后修改日期:
  • 錄用日期:
  • 在線發(fā)布日期: 2016-11-05
  • 出版日期:
文章二維碼