本文選題：多孔介質(zhì)　切入點(diǎn)：微通道　出處：《化工學(xué)報(bào)》2017年09期 　論文類型：期刊論文

【摘要】：制作了具有3種不同孔隙率(0.85、0.75和0.60)的多孔鎳粉樣本,并進(jìn)行了毛細(xì)抽吸實(shí)驗(yàn)和蒸發(fā)冷卻實(shí)驗(yàn)(包括穩(wěn)態(tài)冷卻實(shí)驗(yàn),初始狀態(tài)為干態(tài)和濕態(tài)的冷卻實(shí)驗(yàn)),以探究多孔介質(zhì)抽吸和蒸發(fā)過(guò)程規(guī)律。毛細(xì)抽吸實(shí)驗(yàn)發(fā)現(xiàn)孔隙率大的鎳粉樣本抽吸速率更快,且根據(jù)毛細(xì)單管抽吸實(shí)驗(yàn)和毛細(xì)抽吸理論分析結(jié)果表明:孔隙率大的鎳粉樣本具有更大孔徑是其抽吸速率更快的根本原因。穩(wěn)態(tài)冷卻實(shí)驗(yàn)結(jié)果表明孔隙率0.85的鎳粉樣本具有最快的蒸發(fā)速率,0.60鎳粉樣本蒸發(fā)速率最慢,這是受到多孔樣本抽吸速率主導(dǎo)的結(jié)果。在初始干態(tài)冷卻實(shí)驗(yàn)中,孔隙率為0.85的鎳粉樣本具有最大的瞬態(tài)冷卻熱通量,但要達(dá)到最大冷卻溫度幅度須取得瞬態(tài)冷卻熱流與冷卻時(shí)間的平衡,因此孔隙率0.75樣本冷卻溫度幅度最大。在初始濕態(tài)實(shí)驗(yàn)中,孔隙率為0.85的鎳粉樣本具有最高的燒干溫度和最長(zhǎng)的燒干時(shí)間,表現(xiàn)出最強(qiáng)的抗燒干性能,但是孔隙率0.75樣本劇烈蒸發(fā)過(guò)熱度最小且劇烈蒸發(fā)時(shí)間最長(zhǎng),最能有效抑制樣本熱端溫度升高。
[Abstract]:Three kinds of porous nickel powder samples with different porosity (0.85% 0.75 and 0.60) were prepared, and capillary suction experiments and evaporative cooling experiments (including steady state cooling experiments) were carried out. The initial state is dry and wet cooling experiments to explore the process of porous media suction and evaporation. Capillary suction experiment found that the high porosity of nickel powder sample suction rate is faster. According to the experiment of capillary single tube suction and the theoretical analysis of capillary suction, it is shown that the larger pore size of nickel powder sample with large porosity is the fundamental reason for the faster suction rate, and the steady state cooling experiment shows that the nickel with high porosity of 0.85 is the main reason for faster suction rate. The sample of powder has the fastest rate of evaporation, and the sample of nickel powder has the slowest evaporation rate. In the initial dry cooling experiment, the sample of nickel powder with porosity of 0.85 has the largest transient cooling heat flux. However, in order to achieve the maximum cooling temperature amplitude, the equilibrium between transient cooling heat flow and cooling time must be obtained, so the porosity 0.75 sample cooling temperature amplitude is the largest. The sample of nickel powder with porosity of 0.85 had the highest drying temperature and the longest drying time, which showed the strongest anti-drying performance, but the porosity of 0.75 sample had the smallest superheat of intense evaporation and the longest time of intense evaporation. It is the most effective method to restrain the temperature rise at the hot end of the sample.
【作者單位】： 山東大學(xué)能源與動(dòng)力工程學(xué)院;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(51641607)~~
【分類號(hào)】：TQ02

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