摘要
为研究玉米粉的热物理特性参数,收集不同品种玉米,过1.5 mm和2.0 mm筛片粉碎后,分析其营养组成、粉料容重、平均粒径和热物理特性参数及其之间的相关性。结果表明:玉米粉的比热随着温度的升高而增大,不同品种玉米粉的比热差异并不显著。在25℃时,粉碎时过1.5 mm和2.0 mm筛片玉米粉的比热平均值为2 069.9、1 960.3 J/(kg·K),热传导系数平均值为0.090 1、0.084 0 W/(m·K),热扩散系数平均值为0.080 3、0.076 1 m2·s-1·10-6。相关性分析表明:热传导系数与粗淀粉含量之间呈显著正相关(r=0.648*),与粗脂肪含量之间呈显著负相关(r=-0.763*);热扩散系数与粗淀粉含量之间呈显著正相关(r=0.710*),与粗脂肪含量之间呈极显著负相关(r=-0.773**),与粉料容重之间呈显著负相关(r=-0.756*)。
In order to study the thermal physical properties of corn power, different corn cultivars sampies were collected and grinded （the diameter of the sieve were 1.5 and 2.0 mm）, the nutritional composition, the density, the particle size and the thermal physical properties were analyzed, and correlation analysis was finished. The resuhs showed that, the specific heat increased with the heating temperature increasing. The variation was medium for the specific heat at different temperature among corn euhivars. At 25 ℃, the mean of the specific heat of corn power （the diameter of the sieve were 1.5 and 2.0 mm） were 2 069.9, 1 960.3 J/（kg·K）, the mean of the thermal conductivity were 0.090 1,0.084 0 W/（m· K）, the mean of the thermal diffusivity were 0.080 3, 0.076 1 m^2· s^-1 ·10^-6. Correlation analysis showed that, the thermal conductivity was positive correlative with the content of crude starch （r=0.648^＊）, it was negative correlative with the crude fat （r=-0.763^＊）. The thermal diffusivity was positive correlative with the content of crude starch （r=0.710^＊）, it was significant negative correlative with the crude fat （r=-0.773^＊） and it was negative correlative with the density （r=-0.756^＊）.
出处
《饲料工业》
北大核心
2018年第3期1-8,共8页
Feed Industry
基金
公益性行业(农业)科研专项[201203015]
关键词
玉米粉
品种
粒度
比热
热传导系数
热扩散系数
corn power
cultivar
particle size
specific heat
thermal conductivity
thermal diffusivity
