本文選題：氣溶膠　切入點(diǎn)：顆粒物濃度　出處：《東華大學(xué)》2013年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著我國社會(huì)經(jīng)濟(jì)發(fā)展加快和社會(huì)地位的提高,人們對(duì)居住環(huán)境的要求進(jìn)一步提高,已不再局限于傳統(tǒng)的溫度、濕度和速度的要求,而是對(duì)室內(nèi)外空氣品質(zhì)提出了更高的要求。同時(shí)隨著國家出臺(tái)對(duì)污染物濃度控制的限值,如何去除污染物成為研究熱點(diǎn)。因此,本文采用數(shù)值模擬的方法對(duì)液滴從空氣中去除氣溶膠顆粒物的機(jī)制和過程進(jìn)行分析討論。 模擬采用先前文獻(xiàn)關(guān)于典型單個(gè)液滴捕集氣溶膠顆粒物的數(shù)據(jù),分別運(yùn)用氣--固兩相流的層流和湍流模型。對(duì)于單液滴捕集氣溶膠進(jìn)行了數(shù)值計(jì)算。在相同的實(shí)驗(yàn)條件下將模擬結(jié)果和經(jīng)典實(shí)驗(yàn)數(shù)據(jù)進(jìn)行對(duì)比,結(jié)果表明,本文的數(shù)值計(jì)算模型是可靠一致的。 在數(shù)值模式得以驗(yàn)證的基礎(chǔ)上,針對(duì)層流狀態(tài)下的不同粒徑顆粒物進(jìn)行了模擬。對(duì)測液滴直徑,速度和粒徑對(duì)顆粒物軌跡、濃度和沉積狀態(tài)的影響、顆粒物分布以及被捕集的規(guī)律進(jìn)行分析總結(jié)。結(jié)果表明：隨著液滴直徑增大,對(duì)同一直徑的粒子捕集效率逐漸降低；在液滴直徑相同時(shí),隨著粒子直徑的增大,捕集效率則是逐漸增大。 此外,模擬針對(duì)湍流狀態(tài)下的顆粒物軌跡,濃度和沉積狀態(tài)進(jìn)行了研究。結(jié)果表明,湍流的因素對(duì)顆粒物捕集效率存在明顯影響。液滴直徑、速度和粒徑等因素對(duì)顆粒物捕集效率的影響不同。通過一系列的模擬對(duì)比,可知,湍流狀態(tài)下的捕集效率明顯大于層流狀態(tài)下的捕集效率。液滴對(duì)大粒子和小粒子在層流和湍流下捕集效率的差值隨著液滴直徑變化趨勢不同。
[Abstract]:With the acceleration of social and economic development and the improvement of social status in China, people's demand for living environment has been further raised, and is no longer limited to the traditional requirements of temperature, humidity and speed. At the same time, with the introduction of limits on the concentration of pollutants, how to remove pollutants has become a research hotspot. In this paper, the mechanism and process of removing aerosol particles from air by the method of numerical simulation are analyzed and discussed. Using data from previous literature on the capture of aerosol particles by typical individual droplets, The laminar and turbulent models of gas-solid two-phase flow are used to numerically calculate the single droplet trapping aerosol. Under the same experimental conditions, the simulation results are compared with the classical experimental data, and the results show that, The numerical model in this paper is reliable and consistent. Based on the verification of the numerical model, the effects of droplet diameter, velocity and particle size on the trajectory, concentration and deposition state of particles in laminar flow were simulated. The results show that with the increase of droplet diameter, the trapping efficiency of particles of the same diameter decreases gradually, and when the droplet diameter is the same, the particle size increases with the increase of droplet diameter. The capture efficiency increases gradually. In addition, the trajectory, concentration and deposition of particles in turbulent state are studied. The results show that the turbulent factors have a significant effect on the capture efficiency of particulate matter. The effects of velocity and particle size on the capture efficiency of particulate matter are different. The trapping efficiency in turbulent state is obviously higher than that in laminar flow, and the difference between droplet trapping efficiency for large particle and small particle in laminar flow and turbulent flow is different with the change trend of droplet diameter.
【學(xué)位授予單位】：東華大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：TU834.637

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 彭紅,秦瑜;降水對(duì)氣溶膠粒子清除的參數(shù)化[J];大氣科學(xué);1992年05期

2 石廣玉;王標(biāo);張華;趙劍琦;檀賽春;溫天雪;;大氣氣溶膠的輻射與氣候效應(yīng)[J];大氣科學(xué);2008年04期

3 黃美元,王自發(fā);東亞地區(qū)黃沙長距離輸送模式設(shè)計(jì)[J];大氣科學(xué);1998年04期

4 謝華,劉中平;通風(fēng)、空調(diào)設(shè)計(jì)中的CFD技術(shù)[J];房材與應(yīng)用;2004年01期

5 徐玲,秦瑜;云下氣體濕清除過程參數(shù)化[J];環(huán)境化學(xué);1992年01期

6 趙海波,鄭楚光;降雨過程中氣溶膠濕沉降的數(shù)值模擬[J];環(huán)境科學(xué)學(xué)報(bào);2005年12期

7 方志華;劉兆榮;白郁華;李金龍;;Maple在氣溶膠云下清除數(shù)值模擬中的應(yīng)用[J];計(jì)算機(jī)與應(yīng)用化學(xué);2009年06期

8 姚克亞,郭俊,傅云飛,劉勇;氣溶膠粒子的降雨清除[J];氣候與環(huán)境研究;1999年03期

9 鄒廬泉,季學(xué)李;自然通風(fēng)對(duì)辦公室內(nèi)氣溶膠的影響[J];上海環(huán)境科學(xué);2000年01期

10 石春娥,姚克亞,郭俊;降雨對(duì)云下污染氣體SO_2清除的研究[J];中國科學(xué)技術(shù)大學(xué)學(xué)報(bào);2000年06期

，

本文編號(hào)：1594046