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

【摘要】：隨著我國社會經濟發(fā)展加快和社會地位的提高,人們對居住環(huán)境的要求進一步提高,已不再局限于傳統(tǒng)的溫度、濕度和速度的要求,而是對室內外空氣品質提出了更高的要求。同時隨著國家出臺對污染物濃度控制的限值,如何去除污染物成為研究熱點。因此,本文采用數(shù)值模擬的方法對液滴從空氣中去除氣溶膠顆粒物的機制和過程進行分析討論。 模擬采用先前文獻關于典型單個液滴捕集氣溶膠顆粒物的數(shù)據(jù),分別運用氣--固兩相流的層流和湍流模型。對于單液滴捕集氣溶膠進行了數(shù)值計算。在相同的實驗條件下將模擬結果和經典實驗數(shù)據(jù)進行對比,結果表明,本文的數(shù)值計算模型是可靠一致的。 在數(shù)值模式得以驗證的基礎上,針對層流狀態(tài)下的不同粒徑顆粒物進行了模擬。對測液滴直徑,速度和粒徑對顆粒物軌跡、濃度和沉積狀態(tài)的影響、顆粒物分布以及被捕集的規(guī)律進行分析總結。結果表明：隨著液滴直徑增大,對同一直徑的粒子捕集效率逐漸降低；在液滴直徑相同時,隨著粒子直徑的增大,捕集效率則是逐漸增大。 此外,模擬針對湍流狀態(tài)下的顆粒物軌跡,濃度和沉積狀態(tài)進行了研究。結果表明,湍流的因素對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顆粒物捕集效率的影響不同。通過一系列的模擬對比,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.
【學位授予單位】：東華大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：TU834.637

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