利用相变释能的农产品冷藏设备主动防除冰方法
发布时间：2019-04-17 12:02
【摘要】：为减小农副产品冷藏设备表面的结冰危害,提高部件表面的抗结冰能力和设备运转效率,该文提出利用相变释能的主动防除冰方法。试验以带有不同凹坑尺寸的聚甲基丙烯酸甲酯(polymethyl methacrylate,PMMA)和6061铝合金作为基体材料,凹坑内填充气体或不同冰点的介质,表面覆盖双向拉伸聚丙烯薄膜(biaxially oriented polypropylene,BOPP)。试验采用水杯制冰法,测量表面结冰附着强度,结合剥离界面的形态,分析相变时差对界面附着强度的影响机理。结果表明:相对于光滑PMMA试样的表面附着强度169.81 kPa,试样(凹坑内分别填充纯净水和体积分数为6%乙醇溶液)表面的附着强度分别降低了100%和82%;对比无凹坑铝合金试样表面的附着强度,凹坑内填充体积分数为15%乙醇溶液低冰点溶液的试样表面附着强度可减小76.52%。因此利用不同水溶液的相变时间差和膨胀释能可减小试样表面的附着强度,并且试验表明试样材料、凹坑尺寸对附着强度的降低作用影响较小。利用相变时差和相变膨胀释能破坏冰在弹性冻结界面的接触稳定性,达到降低结冰表面附着强度的目的,并且水溶液中水的体积分数越大,试样结冰表面的附着强度的越小。研究结果为农产品冷藏领域中的防、除冰方法研究和开发提供参考。
[Abstract]:In order to reduce the icing hazard on the surface of agricultural and byproduct refrigerating equipment, and to improve the anti-icing ability and the running efficiency of the equipment, an active de-icing method using phase change energy release is proposed in this paper. In this experiment, polymethyl methacrylate (polymethyl methacrylate,PMMA) and 6061 aluminum alloy with different pit sizes were used as matrix materials, filled with gas or medium with different freezing points in the pit, and the surface was covered with biaxially stretched polypropylene (biaxially oriented polypropylene,BOPP) film. In the experiment, the ice-forming strength of the surface was measured by means of water cup method, and the influence mechanism of phase transition time difference on the adhesion strength of the interface was analyzed combined with the morphology of the peeling interface. The results show that compared with the surface adhesion strength of smooth PMMA sample, the adhesion strength of 169.81 kPa, sample (pure water filled in pit and 6% ethanol solution by volume) is reduced by 100% and 82%, respectively. Compared with the adhesion strength of aluminum alloy specimens without crater, the adhesion strength of aluminum alloy specimens filled with 15% ethanol solution and low freezing point solution can be reduced by 76.52%. Therefore, the adhesion strength of the sample surface can be reduced by using the phase transition time difference and expansion release energy of different aqueous solution, and it is shown that the size of the pit has little effect on the decrease of the adhesion strength of the sample material. The contact stability of ice at the elastic freezing interface is destroyed by phase transition time difference and phase transformation expansion energy release, so as to reduce the adhesion strength of ice surface. Moreover, the larger the volume fraction of water in aqueous solution, the smaller the adhesion strength of ice surface. The results provide a reference for the research and development of control and deicing methods in the field of refrigeration of agricultural products.
【作者单位】： 吉林大学生物与农业工程学院;吉林大学汽车仿真与控制国家重点实验室;
【基金】：吉林省教育厅“十二五”科学研究项目(2015-473,2015-417) 吉林大学研究生创新基金项目(2016167)联合资助
【分类号】：TB657
，
本文编号：2459408
[Abstract]:In order to reduce the icing hazard on the surface of agricultural and byproduct refrigerating equipment, and to improve the anti-icing ability and the running efficiency of the equipment, an active de-icing method using phase change energy release is proposed in this paper. In this experiment, polymethyl methacrylate (polymethyl methacrylate,PMMA) and 6061 aluminum alloy with different pit sizes were used as matrix materials, filled with gas or medium with different freezing points in the pit, and the surface was covered with biaxially stretched polypropylene (biaxially oriented polypropylene,BOPP) film. In the experiment, the ice-forming strength of the surface was measured by means of water cup method, and the influence mechanism of phase transition time difference on the adhesion strength of the interface was analyzed combined with the morphology of the peeling interface. The results show that compared with the surface adhesion strength of smooth PMMA sample, the adhesion strength of 169.81 kPa, sample (pure water filled in pit and 6% ethanol solution by volume) is reduced by 100% and 82%, respectively. Compared with the adhesion strength of aluminum alloy specimens without crater, the adhesion strength of aluminum alloy specimens filled with 15% ethanol solution and low freezing point solution can be reduced by 76.52%. Therefore, the adhesion strength of the sample surface can be reduced by using the phase transition time difference and expansion release energy of different aqueous solution, and it is shown that the size of the pit has little effect on the decrease of the adhesion strength of the sample material. The contact stability of ice at the elastic freezing interface is destroyed by phase transition time difference and phase transformation expansion energy release, so as to reduce the adhesion strength of ice surface. Moreover, the larger the volume fraction of water in aqueous solution, the smaller the adhesion strength of ice surface. The results provide a reference for the research and development of control and deicing methods in the field of refrigeration of agricultural products.
【作者单位】： 吉林大学生物与农业工程学院;吉林大学汽车仿真与控制国家重点实验室;
【基金】：吉林省教育厅“十二五”科学研究项目(2015-473,2015-417) 吉林大学研究生创新基金项目(2016167)联合资助
【分类号】：TB657
，
本文编号：2459408
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