检索结果-南通市图书馆

Field synergy analysis of different flow patterns in falling-film dehumidification system with horizontal pipes

在线全文

学校读者我要写书评

暂无评论

Journal of Central South University 2020年第8期27卷 2353-2366页

作者： niu run-ping KUANG Da-qing WANG Shi-zheng CHEN Xiao-yi Beijing Engineering Research Center of Sustainable Energy and Buildings Beijing University of Civil Engineering and ArchitectureBeijing 100044China

Effects of the flow pattern of intertubular liquid film on mass and heat transfer synergies in a falling-film dehumidification system with horizontal pipes are studied.A flow model of the dehumidifying solution between horizontal pipes is established using Fluent software,the rule of transitions of the flow pattern between pipes is studied,critical Reynolds numbers of flow pattern transitions are obtained,and the accuracy of the model is verified by *** mass transfer synergy angle and heat transfer synergy angle are respectively used as evaluation criteria for the mass transfer synergy and heat transfer synergy,and distribution laws of the synergy angles for droplet,droplet columnar and curtain flow patterns are *** results show that the mass transfer synergy angles corresponding to droplet,droplet columnar and curtain flow patterns all rise to a plateau with *** mean mass-transfer synergy angle is 98°for the droplet flow pattern,higher than 96.5°for the droplet columnar flow pattern and 95°for the curtain flow *** results show that the mass transfer synergy of the droplet flow pattern is better than that of the droplet columnar flow pattern and that of the curtain flow pattern.

关键词： film falling between horizontal pipes fluent software flow pattern of liquid film synergy angle mass and heat transfer

在线全文

学校读者我要写书评

暂无评论

开窗对汽车气动力和FE影响的模拟研究

计算机仿真 2023年第5期40卷 202-207页

作者：牛润萍贾小婷北京建筑大学环境与能源应用工程学院北京100044

随着我国基础建设事业的发展,家用汽车成了人们出行的主要交通工具,为了研究汽车开窗行驶对气动力和燃油经济性的影响,从人类行为的角度出发节约能源。利用数值模拟方法使用FLUENT软件得到了20种开窗方案的气动力系数。通过对比分析发... 详细信息

随着我国基础建设事业的发展,家用汽车成了人们出行的主要交通工具,为了研究汽车开窗行驶对气动力和燃油经济性的影响,从人类行为的角度出发节约能源。利用数值模拟方法使用FLUENT软件得到了20种开窗方案的气动力系数。通过对比分析发现开窗方案与气动力之间存在一定的规律,然后进一步讨论了开窗方案对燃油经济性的影响,发现开窗方案2、方案5、方案16的燃油增长率最小,适合在夏季出行时使用,既可以通风又可以减小能耗。

关键词：计算流体力学开窗气动力燃油经济性

在线全文

学校读者我要写书评

暂无评论

金属填料蒸发型空调系统性能的预测模型

重庆大学学报（自然科学版） 2007年第5期30卷 103-107页

作者：牛润萍由世俊张欢天津大学环境科学与工程学院天津300072

针对金属填料蒸发型空调系统内部传热传质过程的复杂性,利用人工神经网络的非线性映射功能、学习功能和记忆功能,通过对数据样本的学习,建立起描述金属填料蒸发型空调系统性能与其影响因素间关系的神经网络模型,再根据此模型来预测影响... 详细信息

针对金属填料蒸发型空调系统内部传热传质过程的复杂性,利用人工神经网络的非线性映射功能、学习功能和记忆功能,通过对数据样本的学习,建立起描述金属填料蒸发型空调系统性能与其影响因素间关系的神经网络模型,再根据此模型来预测影响因素变化引起的蒸发型空调系统性能变化。利用试验数据对网络模型进行训练和验证,检验模型预测的准确性。结果表明:网络模型输出结果与实验数据比较吻合,相对误差大多在6%以内,证实该网络模型对金属填料蒸发型空调系统性能预测的可行性。

关键词：金属填料蒸发型空调系统人工神经网络模型

在线全文

学校读者我要写书评

暂无评论

主动式太阳房相变蓄热地板供暖实测研究

建筑科学 2013年第8期29卷 49-52,76页

作者：牛润萍徐小龙北京建筑工程学院环境与能源工程学院北京100044 沈阳建筑大学市政与环境工程学院沈阳110168

本实验考虑到建筑本身的节能,采用了保温、隔热性能良好的高性能围护结构搭建了主动式太阳房,以太阳能热水为热源,实验房的2个房间分别采用相变蓄热地板供暖系统与干式地埋管地板供暖系统,实测了2种地板供暖系统的蓄放热性能以及其对房... 详细信息

本实验考虑到建筑本身的节能,采用了保温、隔热性能良好的高性能围护结构搭建了主动式太阳房,以太阳能热水为热源,实验房的2个房间分别采用相变蓄热地板供暖系统与干式地埋管地板供暖系统,实测了2种地板供暖系统的蓄放热性能以及其对房间热性能的影响。运用相变蓄热地板供暖的房间,提高了室内最低温度的同时,温度波动减小了3.5℃,铺设的相变材料利用率较高。可根据需要进行自动调节的主动式太阳房供暖系统与相变蓄能地板的结合应用达到了节能降耗和提高房间舒适度的效果。

关键词：主动式太阳房地板供暖相变材料PCM

在线全文

学校读者我要写书评

暂无评论

影响水平管降膜管间流态因素的实验研究

科学技术与工程 2016年第6期16卷 43-47,65页

作者：张睿航陈敬东牛润萍北京建筑大学环境与能源工程学院北京100044

水平管降膜管间流态是影响其技术应用的重要参数之一。采用实验研究的方法,通过搭建水平管降膜流动形态的实验装置,选用溴化锂溶液作为实验溶液,研究管间距和管材对水平管降膜管间流态的影响。实验研究表明,管间距略微增大时,管间流态... 详细信息

水平管降膜管间流态是影响其技术应用的重要参数之一。采用实验研究的方法,通过搭建水平管降膜流动形态的实验装置,选用溴化锂溶液作为实验溶液,研究管间距和管材对水平管降膜管间流态的影响。实验研究表明,管间距略微增大时,管间流态与未改变管间距时流态的上一级流态相同。继续增大管间距到大于原来的2倍,流态最终会变为滴状;但出现部分交叉滴状流。当管材由铜管变为塑料管后,溶液在管间会出现倾斜的情况,即不能够垂直湿润相邻的圆管;并且管间小部分溶液会出现向下一级流态转变的趋势,直接影响到管间流体的连续性。

关键词：水平管降膜实验研究溴化锂溶液管间流态

在线全文

学校读者我要写书评

暂无评论

基于中高温冷凝热再生的溶液再生器模拟

科学技术与工程 2019年第20期19卷 328-338页

作者：吕浩牛润萍张睿航匡大庆陈潇义北京建筑大学环境与能源工程学院

为探究不同入口参数对溶液除湿再生量的影响,提出一种溶液除湿与中高温热泵耦合的空调系统,将中高温热泵的冷凝热应用于溶液除湿空调系统的溶液再生。通过建立溶液除湿再生器仿真计算模型,研究了不同入口溶液和空气参数下溶液出口浓度... 详细信息

为探究不同入口参数对溶液除湿再生量的影响,提出一种溶液除湿与中高温热泵耦合的空调系统,将中高温热泵的冷凝热应用于溶液除湿空调系统的溶液再生。通过建立溶液除湿再生器仿真计算模型,研究了不同入口溶液和空气参数下溶液出口浓度和再生器内温度分布情况,并与中低温冷凝热再生进行对比。结果表明:随着空气入口侧风量、溶液入口侧温度、溶液入口侧流量的增加再生量呈上升趋势;随溶液入口侧浓度的增加再生量呈下降趋势;在80℃附近的冷凝热溶液再生量比40℃时高1.5~1.9 g/s。

关键词：溶液除湿再生器中高温冷凝热再生量

Development of CaP nanocomposites as photothermal actuators for doxorubicin delivery to enhance breast cancer treatment

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2021年第4期63卷 73-80页

作者： Jie Liu Li Li run Zhang Zhi ping Xu Australian Institute for Bioengineering and Nanotechnology The University of QueenslandSt LuciaQLD4072Australia

Breast cancer is the most common one in women worldwide and doxorubicin(Dox)is one of the most commonly used and effective drugs for breast cancer ***,Dox-based chemotherapy faces irreversible cardiotoxicity and unsatisfactory therapy *** is desirable to devise Dox nanoformulations with less adverse effects and greater therapeutic efficacy for this cancer *** this work,a multifunctional calcium phosphate nanoformulation(ICG-Dox/DNA@CaP)was developed by co-loading Dox/DNA complexes and indocyanine green(ICG)molecules for photothermal therapy(PTT)-enhanced *** this nanocomposite,using DNA as Dox carrier facilitated Dox loading into the CaP matrix,and significantly reduced Dox leakage as well as cytotoxicity in comparison with that of free Dox in physiological medium(pH 7.4).In specific,ICG-Dox/DNA@CaP only released Dox in a weakly acidic nuclease-containing environment,such as tumor microenvironment and endosome/***,Dox/DNA complexes exhibited synergistic interactions with ICG-based photothermal effect on tumor cell apoptosis in this ICG-Dox/DNA@CaP *** work has demonstrated a new strategy to combine FDA-approved therapeutics(Dox and ICG)in CaP-based nanomaterials for reduced cytotoxicity and enhanced therapeutic effect,and provided a new way to engineer CaP carriers as multifunctional delivery systems for clinical anti-cancer therapy.

关键词： chemotherapy doxorubicin breast

Efficient degradation of methyl orange via multilayer films of titanium dioxide and silicotungstic acid

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2012年第11期55卷 2366-2372页

作者： niu ping HAO JingCheng Key Laboratory for Colloid and Interface Chemistry Ministry of EducationShandong UniversityJinan 250100China Key Laboratory of Coordination Chemistry and Functional Materials in Universities of Shandong Province Dezhou UniversityDezhou 253023China

We report layer-by-layer （LbL） assembly of TiO2 and H4SiW12O40 （SiW12） multilayer film on silicon wafers and glass slides for photocatalytic degradation of methyl orange （MO）. The photocatalytic efficiency of the obtained multilayer film increases along with the decrease of pH and salt concentration of the incubation solution. The results show that MO can be almost re- moved in pH 2.0 solution without salt addition in the first 60 min incubation when MO concentration is lower than 15 mg/L. Different salts show an apparent inhibitory effect on photocatalytic degradation of MO with the order of ZnC12〉KCI〉 NaC1〉LiCI. The TiO2/SiW12 multilayer film maintains photocatalytic activity even after five degradation cycles. The reaction of MO photodegradation accords with an apparent first-order dynamics.

关键词： TiO2 silicotungstic acid LbL assembly photocatalytic degradation methyl orange

Optimal Design of Surface Structure of a Magnetic Head

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Mechanical Engineering 2009年第5期22卷 651-657页

作者： WANG Yazhen niu Rongjun HUANG ping School of Mechanical andAutomotive Engineering South China University of Technology Guangzhou 510640 China Guangdong College of Industry and Commerce Guangzhou 510510 China

Currently, the surface structure of a magnetic head has been transferred from a positive to a negative model. In order to increase magnetic storage density and to decrease the flight height, the surface structure of a head needs to be optimized continually. In the present paper, the influence of surface structure of a negative magnetic head on its flight attitude is analyzed in brief by both theoretical analysis and numerical simulation. Firstly, based on theoretical analysis, one-dimensional model of optimal design is built whose results play an important role in guiding for the two-dimensional model. Secondly, to analyze the impacts of different slructures of negative pressure heads, the original head structure is divided into five zones; the impacts of different zones on both pressure distribution and load carrying capacity were detailed analyzed by numerical analysis. Thirdly, remain the leading-head structure of the negative head, and optimized tail-end structure can be gained by the regional planning strategy to control the gas film pressure distribution. With layout strategy, three kinds of structures of the head were designed. The results show that the tail-end structure impacts on the flight performances significantly and the middle boss plays a major role on positive pressure, while the bilateral bosses lying in either side play assistant regulating role. The structures of bilateral bosses have slightly impact on pressure distribution. The results also show that an optimum tail structure can meet the needs of a lower flight height and a larger magnetic storage density.

关键词： surface structure optimum design numerical analysis