党参根气体射流冲击干燥特性和干燥模型（英文）
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摘要
研究了不同干燥风温(40、50、60、70、80℃)、喷嘴到物料托盘的间距(5、10、15 cm)和风速(8、11、14 m/s)三个因素对党参根气体射流冲击干燥特性的影响,结果表明对党参根气体射流冲击干燥速率(DR)和水分有效扩散系数(D_(eff))的影响强弱顺序依次是风温、喷嘴到物料托盘的间距和风速;党参根气体射流冲击干燥水分有效扩散系数在1.5904×10~(-10)～3.0684×10~(-10)m~2·s~(-1)之间;干燥活化能为15.86 kJ·mol~(-1);Modified Page模型能反映党参根气体射流冲击干燥动力学过程,建立的水分比MR与时间t及干燥工艺参数的方程可有效预测党参根在气体射流冲击干燥过程中水分变化。
Drying characteristics of Codonopsis pilosula roots were investigated in an air-impingement jet dryer under different drying temperatures(40, 50, 60, 70 and 80 ℃), distance from jet nozzle to material tray(DJNMT)(5, 10 and15 cm), and air velocities(8, 11 and 14 m/s). Results indicated that the drying rate(DR)and moisture effective diffusion coefficient(D_(eff))were mainly influenced by the drying temperature of air, followed by DJNMT and air velocity. Deffwas in the range of 1.5904 × 10~(-10) to 3.0684 × 10~(-10) m~2·s~(-1) and the drying activation energy(E_a)was 15.86 kJ·/mol~(-1). The Modified Page model can reflect the dynamics of Codonopsis pilosula roots air impingement drying. The equation of moisture ratio and time and drying process parameters can effectively predict the moisture change of Codonopsis pilosula roots air impingement drying.
Drying characteristics of Codonopsis pilosula roots were investigated in an air-impingement jet dryer under different drying temperatures(40, 50, 60, 70 and 80 ℃), distance from jet nozzle to material tray(DJNMT)(5, 10 and15 cm), and air velocities(8, 11 and 14 m/s). Results indicated that the drying rate(DR)and moisture effective diffusion coefficient(D_(eff))were mainly influenced by the drying temperature of air, followed by DJNMT and air velocity. Deffwas in the range of 1.5904 × 10~(-10) to 3.0684 × 10~(-10) m~2·s~(-1) and the drying activation energy(E_a)was 15.86 kJ·/mol~(-1). The Modified Page model can reflect the dynamics of Codonopsis pilosula roots air impingement drying. The equation of moisture ratio and time and drying process parameters can effectively predict the moisture change of Codonopsis pilosula roots air impingement drying.
引文
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[2]HE Q,ZHU E Y,WANG Z T,et al.Determination of lobetyolin in Radix Codonopsis by high-performance liquid chromatography[J].Chinese Pharmaceutical Journal,2005(1):61-63.
[3]BI H Y,ZHANG L P,CHEN Z,et al.An overview of research on germplasm resources of Radix Codonopsis and their utilization[J].China Journal of Chinese Materia Medica,2008,33(5):590-594.
[4]SINGH B,SONG H,LIU X D,et al.Dangshen(Codonopsis pilosula)and Bai guo(Gingko biloba)enhance learning and memory[J].Alternative Therapies in Health and Medicine,2004,10(4):52-56.
[5]SUN Y,LIU J.Structural characterization of a water-soluble polysaccharide from the roots of Codonopsis piously and its immunity activity[J].International Journal of Biological Macromolecules,2008,43:279-282.
[6]XIAO H W,PANG C L,WANG L H,et al.Drying kinetics and quality of Monukka seedless grapes dried in an air-impingement jet dryer[J].Biosystems Engineering,2010,105(2):233-240.
[7]XIAO H W,BAI J W,XIE L,et al.Thin-layer air impingement drying enhances drying rate of American ginseng(Panax quinquefolium,L.)slices with quality attributes considered[J].Food&Bioproducts Processing,2015,94:581-591.
[8]LI W F,XIAO X L,WANG W.Drying Characteristics and Model of Purple Sweet Potato in Air-impingement Jet Dryer[J].Scientia Agricultura Sinica,2013,46(2):356-366.
[9]ZHANG Q,XIAO H,DAI J,et al.Air impingement drying characteristics and drying model of Hami melon flake[J].Transactions of the Chinese Society of Agricultural Engineering,2011,27(13):382-388.
[10]LIU Y,ZHU W,LIU J.Mass and heat transfer analysis of vacuum infrared radiation drying on rehmanniae[J].Transactions of the Chinese Society for Agricultural Machinery,2011,42(10):135-140.
[11]HONG X,LI B G.Experimental study on thin-layer drying of paddy and moisture diffusion in a kernel[J].Journal of Zhengzhou Grain College,2000,21(2):57-59.
[12]GOYAL R K,ARP K,MANIKANTAN M R,et al.Mathematical modelling of thin layer drying kinetics of plum in a tunnel dryer[J].Journal of Food Engineering,2007,79(1):176-180.
[13]AKPINAR E K.Drying of mint leaves in a solar dryer and under open sun:modelling,performance analyses[J].Energy Conversion&Management,2010,51(12):2407-2418.
[14]O’CALLAGHAN J R,MENZIES D J,BAILEY P H.Digital simulation of agricultural drier performance[J].Journal of Agricultural Engineering Research,1971,16(3):223-244.
[15]WHITE G M,ROSS I J,PONELEIT C G.Fully-exposed drying of popcorn[J].Transactions of the American Society of Agricultural Engineers,1981,24(2):466-468.
[16]BOZKIR O.Thin-layer drying and mathematical modelling for washed dry apricots[J].Journal of Food Engineering,2006,77(1):146-151.
[17]XIAO H W,GAO Z J,LIN H,et al.Air impingement drying characteristics and quality of carrot cubes[J].Journal of Food Process Engineering,2010,33(5):899-918.
[18]LI W,WANG M,XIAO X,et al.Effects of air-Impingement jet drying on drying kinetics,nutrient retention and rehydration characteristics of onion(Allium cepa)slices[J].International Journal of Food Engineering,2015,11(3):435-446.
[19]TOGRUL I T,PEHLIVAN D.Modelling of drying kinetics of single apricot[J].Journal of Food Engineering,2003,58(1):23-32.
[20]PRAKASH S,JHA S K,DATTA N.Performance evaluation of blanched carrots dried by three different driers[J].Journal of Food Engineering,2004,62(3):305-313.
[21]FALADE K O,SOLADEMI O J.Modelling of air drying of fresh and blanched sweet potato slices[J].International Journal of Food Science&Technology,2010,45(2):278-288.
[22]IBRAHIM DOYMAZ,PALA M.The effects of dipping pretreatments on air-drying rates of the seedless grapes[J].Journal of Food Engineering,2002,52(4):413-417.
[23]GOYAL R K,KINGSLY A R P,MANIKANTAN M R,et al.Thin-layer drying kinetics of raw mango slices[J].Biosystems Engineering,2006,95(1):43-49.
[24]TRONCOSO E,PEDRESCHI F.Modeling of textural changes during drying of potato slices[J].Journal of Food Engineering,2007,82(4):577-584.
[25]DOYMAZ I.The kinetics of forced convective air-drying of pumpkin slices[J].Journal of Food Engineering,2007,79(1):243-248.
[26]KAYA A,AYDIN O.An experimental study on drying kinetics of some herbal leaves[J].Energy Conversion&Management,2009,50(1):118-124.