机械与电子
機械與電子
궤계여전자
Machinery & Electronics
2015年
11期
17-20
,共4页
胡萝卜%对流传质系数%热风干燥%菲克定律
鬍蘿蔔%對流傳質繫數%熱風榦燥%菲剋定律
호라복%대류전질계수%열풍간조%비극정률
carrot%mass transfer coefficient%hot air drying%Fick theorem
将逆数值方法应用于物性测试，通过建立胡萝卜的内部水分扩散模型，把反映物料干燥过程动态特性的实验含水率曲线与物料颗粒内部的水分扩散相结合，确定胡萝卜在脱水过程中的对流传质系数。同时研究了厚度、半径、干燥温度和相对湿度对胡萝卜切片对流传质系数的影响。结果表明，对流传质系数不是一个常数。对流传质系数随厚度和干燥温度的增大而增大；随相对湿度的减小而减小；半径的增大对其无明显影响。
將逆數值方法應用于物性測試，通過建立鬍蘿蔔的內部水分擴散模型，把反映物料榦燥過程動態特性的實驗含水率麯線與物料顆粒內部的水分擴散相結閤，確定鬍蘿蔔在脫水過程中的對流傳質繫數。同時研究瞭厚度、半徑、榦燥溫度和相對濕度對鬍蘿蔔切片對流傳質繫數的影響。結果錶明，對流傳質繫數不是一箇常數。對流傳質繫數隨厚度和榦燥溫度的增大而增大；隨相對濕度的減小而減小；半徑的增大對其無明顯影響。
장역수치방법응용우물성측시，통과건립호라복적내부수분확산모형，파반영물료간조과정동태특성적실험함수솔곡선여물료과립내부적수분확산상결합，학정호라복재탈수과정중적대류전질계수。동시연구료후도、반경、간조온도화상대습도대호라복절편대류전질계수적영향。결과표명，대류전질계수불시일개상수。대류전질계수수후도화간조온도적증대이증대；수상대습도적감소이감소；반경적증대대기무명현영향。
This paper has applied inverse nu-merical method to the estimation of physical prop-erty.By building an internal moisture diffusion model and selecting connective boundary condi-tions,the moisture diffusion inside the material has been organically combined with the drying ex-perimental curves to determine the mass transfer coefficient.At the same time,the impact of thick-ness,radius,drying temperature and relative hu-midity on the mass transfer coefficient of carrot section is studied. The results show the mass transfer is not a constant.The mass transfer coef-ficient had an increased trend followed by thickness and temperature,and decreased with the decrease of relative humidity;and there is no obvious effect from the increases of the radius.
