摘要
采用微热探针法测试装置进行了果汁热导率试验。该装置结构简单、使用方便 ,每次只需试样 5 0mL ,且测试时间 <2 0s ,试样温升 <2℃ ,减小了自然对流造成的测试误差 ,测试过程中可反映试样的真实状态。测定了2 0种不同质量分数苹果汁的热导率 ,苹果汁的质量分数采用WAY(2WAJ)型阿贝折射仪测定。试验结果表明 ,苹果汁质量分数与热导率呈高度负相关 (r >90 % ) ,并得到了 2 7℃环境温度下不同质量分数区域苹果汁热导率的经验公式。对几种不同质量分数区域苹果汁热导率的测试结果表明 ,实际测定结果与经验公式的计算结果能很好地吻合。
A tiny heat probe was used to measure the thermal conductivities of apple juices with 20 different concentrationscontents. The juice concentration was also measured using a WAY (2WAJ) Abbe refractometer. The results show that there was a high negative correlation between the concentrations and thermal conductivities. A new empirical equation was obtained to express the relationship between the thermal conductivities and concentrations of apple juiceat temperature 27℃. The simple method was showed to be convenient, easy handling, 20 seconds time-consuming, only 50mL samples, lower than 2℃ temperature increase and could give accurate results of the samples because of the low convection error.
出处
《中国农业大学学报》
CAS
CSCD
北大核心
2005年第1期60-63,共4页
Journal of China Agricultural University
基金
农业部可再生能源重点开放试验室资助项目
河南省重大科技攻关项目 (0 32 2 0 10 90 0 )
关键词
微热探针
浓度
苹果汁
热导率
a tiny heat probe
concentration content
apple juice
thermal conductivity
