【摘要】：為減小農(nóng)副產(chǎn)品冷藏設(shè)備表面的結(jié)冰危害,提高部件表面的抗結(jié)冰能力和設(shè)備運轉(zhuǎn)效率,該文提出利用相變釋能的主動防除冰方法。試驗以帶有不同凹坑尺寸的聚甲基丙烯酸甲酯(polymethyl methacrylate,PMMA)和6061鋁合金作為基體材料,凹坑內(nèi)填充氣體或不同冰點的介質(zhì),表面覆蓋雙向拉伸聚丙烯薄膜(biaxially oriented polypropylene,BOPP)。試驗采用水杯制冰法,測量表面結(jié)冰附著強度,結(jié)合剝離界面的形態(tài),分析相變時差對界面附著強度的影響機理。結(jié)果表明:相對于光滑PMMA試樣的表面附著強度169.81 kPa,試樣(凹坑內(nèi)分別填充純凈水和體積分?jǐn)?shù)為6%乙醇溶液)表面的附著強度分別降低了100%和82%;對比無凹坑鋁合金試樣表面的附著強度,凹坑內(nèi)填充體積分?jǐn)?shù)為15%乙醇溶液低冰點溶液的試樣表面附著強度可減小76.52%。因此利用不同水溶液的相變時間差和膨脹釋能可減小試樣表面的附著強度,并且試驗表明試樣材料、凹坑尺寸對附著強度的降低作用影響較小。利用相變時差和相變膨脹釋能破壞冰在彈性凍結(jié)界面的接觸穩(wěn)定性,達(dá)到降低結(jié)冰表面附著強度的目的,并且水溶液中水的體積分?jǐn)?shù)越大,試樣結(jié)冰表面的附著強度的越小。研究結(jié)果為農(nóng)產(chǎn)品冷藏領(lǐng)域中的防、除冰方法研究和開發(fā)提供參考。
[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.
【作者單位】： 吉林大學(xué)生物與農(nóng)業(yè)工程學(xué)院;吉林大學(xué)汽車仿真與控制國家重點實驗室;
【基金】：吉林省教育廳“十二五”科學(xué)研究項目(2015-473,2015-417) 吉林大學(xué)研究生創(chuàng)新基金項目(2016167)聯(lián)合資助
【分類號】：TB657
，

本文編號：2459408