【摘要】 为了解决目前水产品在不同温度下热物性参数数据缺乏的问题,采用微热探针法测试系统对-30℃~20℃温度范围内鳗的热导率进行了系统测试。该测试装置简单、方便,测试时间短(小于40s),试样温升小(<2℃),测试过程中可较为准确地反映试样所处状态的实际物性值。实验测定了20℃、10℃、0℃、-10℃、-20℃和-30℃等6种不同温度条件下鳗的热导率,测试结果表明:在保证较高的测量精度前提下,微热探针法测试系统可方便地测定鳗在不同温度条件下发生相变前后的热导率。温度对鳗的热导率具有显著影响,在冻结点以上,鳗的热导率随温度的升高而增加,而在冻结点以下,其热导率迅速增高,且随温度的下降而呈递增趋势。这一结果可为研究鳗冻结、解冻过程的工程计算提供准确的热物理性质参数,并可为今后研究冷冻或解冻过程的计算机模拟提供基础。更多还原

【Abstract】 The tiny heat probe test system was used to determine the thermal conductivities of Muraenesox cinereus to solve the data scarcity of thermal parameters of aquatic products at different temperatures(from-30 to 20 ℃).It was convenient,easy to handle,required less time(<40 s),caused a little temperature rise(<2 ℃) of the tested sample and was suitable for measuring thermal conductivities of sample with true states.And then the thermal conductivities of Muraenesox cinereus were measured at 20 ℃,10 ℃,0 ℃,-10 ℃,-20 ℃ and-30 ℃ in detail.The results showed that the thermal conductivities of Muraenesox cinereus pre or behind phase transition can be obtained with the high precision by means of the tiny heat probe test system at different temperatures.Temperature had a significant influence on the thermal conductivities of Muraenesox cinereus.The thermal conductivities increased with temperature over the freezing point.The thermal conductivities rapidly increased below the freezing point and it increased with the temperature decreasing.And these studies may give some help to the engineering calculations and computer simulation in the course of freezing and thawing of Muraenesox cinereus.更多还原