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Experimental study of the flow and heat transfer of a gas–water mixture through a packed channel

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Science Bulletin 2016年第5期61卷 406-415页

作者： Xiaolei Zhu xiaofeng sui Yan Zhao Ji'an Meng Zhixin Li School of Aerospace Tsinghua University Beijing Yuanshen Energy Saving Technology Co. Ltd. Thermal Research Institute Tianjin University

Waste heat recovery from the flue gas of gasfired boilers was studied experimentally by measuring the flow and heat transfer of air and water through six kinds of packing with saturated humid air as the simulated flue *** experiments measured the effects of inlet air temperature, inlet air velocity and circulating water flow rate on the flow and heat transfer. The results show that higher inlet air temperatures and lower inlet air velocities lower the flow resistance and increase the heat transfer coefficient. The stainless steel packing had better surface wettability and larger thermal conductivity than the plastic packing, which enhanced the heat transfer between the water and the saturated moist air. When both the flow resistance reduction and the heat transfer enhancement were considered, the experimental results gave an optimal packing-specific surface area. A packed heat exchanger tower was designed for waste heat recovery from the flue gas of gas-fired boilers based on the experimental results which had better flow and heat transfer characteristics with lower pump and fan power consumption, more stable system operation and less thermal fluctuations compared with a non-packed heat transfer system with atomized water.

关键词： Flue gas waste heat recovery Flow and heat transfer Moist air Packed heat exchanger tower

Thermally conductive poly(lactic acid)/boron nitride composites via regenerated cellulose assisted Pickering emulsion approach

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Journal of Materials Science & Technology 2022年第6期101卷 146-154页

作者： Yating Wang Hong Jin Jiajun Shen Bijia Wang Xueling Feng Zhiping Mao Yumei Zhang xiaofeng sui Key Lab of Science and Technology of Eco-Textile Ministry of EducationCollege of ChemistryChemical Engineering and BiotechnologyDonghua UniversityNo.2999North Renmin RoadSongjiang DistrictShanghai 201620China Innovation Center for Textile Science and Technology of DHU Donghua UniversityNo.2999North Renmin RoadSongjiang DistrictShanghai 201620China State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityNo.2999North Renmin RoadSongjiang DistrictShanghai 201620China

Polymer-based thermally conductive composites have attracted tremendous interest in thermal management of ***,it remains challenging to achieve high thermal conductivity partly because the difficulty to obtain favorable distribution and orientation of conductive fillers within the polymer ***,networked boron nitride(BN)conductive pathway was realized within the poly(lactic acid)(PLA)matrix,via regenerated cellulose(RC)-assisted assembly of BN on Pickering emulsion interface based on the noncovalent interaction,followed by solvent evaporation and *** strong noncovalent interactions between BN and RC were found critical to enhance the wettability and stability of BN in aqueous media with a lowest mass ratio of 1:40 of RC and *** obtained PLA/BN composites feature a thermal conductivity of 1.06 W/(m K)at 28.4 wt%BN loading,representing an enhancement of 430%comparing to neat PLA,and the crystallinity of the composites could increase significantly from11.7%(neat PLA)to 43.7%.This simple,environmentally friendly and effective strategy could be easily extended for effective construction of thermally conductive composites.

关键词： Boron nitride Regenerated cellulose Emulsion Noncovalent interaction Thermal conductivity

Polyoxometalate-loaded Nanocellulose Sponge as a Novel Catalyst for the Regioselective Hydroboration of Phenylacetylene

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Paper And Biomaterials 2019年第2期4卷 1-9页

作者： GuoQing Yang CongCong Zhang BiJia Wang ZhiPing Mao Hong Xu Yi Zhong XueLing Feng xiaofeng sui Key Lab of Science and Technology of Eco-textile Ministry of EducationCollege of ChemistryChemical Engineering and BiotechnologyDonghua UniversityShanghai201620China Innovation Center for Textile Science and Technology of DHU Donghua UniversityShanghai201620China

In this work,an amino-modified cellulose nanofiber sponge was prepared and used as a support for polyoxometalate(POM)catalysts with a high loading *** transform infrared spectroscopy,thermogravimetric analysis,and energy-dispersive X-ray spectroscopy revealed that an Anderson-type POM,(NH4)4[CuMo6O18(OH)6]·5H2O was successfully immobilized on the sponge based on electrostatic *** analysis indicated that the POM-loaded sponge retained its porous structure and that the POM was homogeneously distributed on the sponge *** POM-loaded sponge exhibited excellent mechanical properties by recovering 79.9%of its original thickness following a 60%compression *** POM-loaded sponge was found to effectively catalyze the hydroboration of phenylacetylenes,yielding excellent conversion and regioselectivity of up to 96%and 99%,*** catalytic activity remained unchanged after five reuse *** findings represent a scalable strategy for immobilizing POMs on porous supports.

关键词： cellulose nanofiber polyoxometalates catalyst immobilization hydroboration heterogeneous catalyst

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含湿率对多孔介质热导率测量准确性的影响

化工学报 2008年第11期59卷 2768-2773页

作者：于明志隋晓凤彭晓峰方肇洪山东建筑大学热能工程学院山东济南250101 清华大学热能工程系北京100084

Thermal conductivity measurement accuracy of sands was experimentally studied with a hot disk thermal constant analyzer and water morphologies,distribution and evolution at pore scale were observed with charge coupled device(CCD)combined with *** was found that thermal conductivities of samples with a low moisture content(<25%)could not be accurately *** samples with a low moisture content,the analysis showed that the water in the region adjacent to the analyser sensor mainly existed as isolated liquid bridges between/among sand particles and would evaporate and diffuse to relatively far regions because of being heated by the sensor during *** evaporation and diffusion caused the sample composition in the region adjacent to the sensor vary throughout the whole measurement process,and accordingly low accuracy of the obtained thermal *** to high water connectivity in pores,the rate of water evaporation and diffusion in porous media of high moisture content was relatively slow compared with that in porous media of low moisture ***,water in the relatively far region flowed back to the region adjacent to the sensor by capillary ***,sample composition of the region adjacent to the sensor maintained constant and thermal conductivities of porous media with a relatively high moisture content could be measured with high accuracy.

关键词：多孔介质含湿率热导率测量

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活性聚合在星形聚合物合成中的应用

化学进展 2008年第10期20卷 1562-1571页

作者：闫强隋晓锋袁金颖清华大学化学系有机光电子与分子工程教育部重点实验室北京100084

星形聚合物在近年来发展迅速,其结构、形态、合成方法与功能性是高分子科学的研究热点。本文主要从活性离子聚合手段与活性自由基聚合手段两方面对星形聚合物的合成方法进行分类,依托星形聚合物的单体选择、星形臂的特性以及整体功能性... 详细信息

星形聚合物在近年来发展迅速,其结构、形态、合成方法与功能性是高分子科学的研究热点。本文主要从活性离子聚合手段与活性自由基聚合手段两方面对星形聚合物的合成方法进行分类,依托星形聚合物的单体选择、星形臂的特性以及整体功能性进行系统阐述,介绍近年来星形聚合物合成方法、形貌控制以及功能性质的最新研究进展。本文结合现阶段最新的研究成果,对星形聚合物在功能与应用之间的联系进行了展望与预测。

关键词：星形聚合物活性聚合功能性特性星形臂

知识溢出与FDI在中国地区分布的非均衡增长

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科技进步与对策 2011年第2期28卷 33-38页

作者：陈继勇隋晓锋武汉大学经济与管理学院湖北武汉430072

改革开放以来,尤其是邓小平同志南巡讲话和中国入世以来,外商在华直接投资迅速增长,成为推动中国经济发展的重要力量。但FDI在中国的地区分布极不均衡,对中国不同地区经济的均衡发展带来了不利影响。从知识溢出的角度出发,通过建立理论... 详细信息

改革开放以来,尤其是邓小平同志南巡讲话和中国入世以来,外商在华直接投资迅速增长,成为推动中国经济发展的重要力量。但FDI在中国的地区分布极不均衡,对中国不同地区经济的均衡发展带来了不利影响。从知识溢出的角度出发,通过建立理论模型和对中国内地28省市历史数据的实证检验,对影响中国FDI地区分布不均的原因进行了分析。实证结果表明:经济体的科技发展水平可以在很大程度上决定其吸引FDI的总额和其最优FDI额;FDI在中国的地区非均衡分布,在一定程度上是由各省市总体科技水平发展不均造成的;FDI在中国的地区非均衡增长趋势,将在一定时期内继续存在。

关键词：知识溢出外商在华直接投资非均衡增长科技进步

“两型社会”建设中武汉市工业发展战略的实证研究

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科技进步与对策 2009年第4期26卷 22-27页

作者：陈继勇隋晓锋武汉大学经济与管理学院湖北武汉430072

随着武汉城市圈被国务院正式批准为全国"两型社会"改革试验区,该地区在环保、节能方面的现状和发展战略逐渐成为了全国关注的焦点。通过对"武汉城市圈"的"龙头"——武汉市1985～2007年的环境状况、单位工业产值能耗、经济增长和外商直... 详细信息

随着武汉城市圈被国务院正式批准为全国"两型社会"改革试验区,该地区在环保、节能方面的现状和发展战略逐渐成为了全国关注的焦点。通过对"武汉城市圈"的"龙头"——武汉市1985～2007年的环境状况、单位工业产值能耗、经济增长和外商直接投资等变量之间相互关系的实证分析发现,武汉市已经进入了经济增长与环境保护相互促进的发展阶段,环境水平和能耗状况都随经济的不断发展而逐步改善;武汉市引进的外商直接投资虽然对经济发展有一定的促进作用,但总体上质量不高;外商直接投资对武汉工业的知识溢出水平很低;武汉市在某种程度上成为了国际"污染避难所"。

关键词：两型社会武汉城市圈工业发展战略资源节约环境保护外商直接投资

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无机纳米材料表面引发自由基可控聚合反应

化学进展 2008年第7期20卷 1122-1127页

作者：隋晓锋袁金颖袁伟忠周密清华大学化学系有机光电子与分子工程教育部重点实验室北京100084

无机纳米-高分子杂化材料具有优异的性能及广阔的应用前景,引起人们的广泛关注。本文综述了无机纳米材料表面引发自由基可控聚合反应在合成无机-高分子纳米杂化材料方面的广泛应用,包括表面引发原子转移自由基聚合(ATRP)、表面引发可逆... 详细信息

无机纳米-高分子杂化材料具有优异的性能及广阔的应用前景,引起人们的广泛关注。本文综述了无机纳米材料表面引发自由基可控聚合反应在合成无机-高分子纳米杂化材料方面的广泛应用,包括表面引发原子转移自由基聚合(ATRP)、表面引发可逆加成-断裂链转移自由基聚合(RAFT)、表面引发稳定氮氧自由基聚合(NMP)。着重总结了近几年来这类杂化材料在功能性研究上新的进展,并对今后研究的发展趋势进行了展望。

关键词：无机纳米材料表面引发聚合引发体系

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大豆脱腥及胰蛋白酶抑制因子去除方法的研究

中国酿造 2010年第2期29卷 151-154页

作者：管斌隋晓峰孔青中国海洋大学食品科学与工程学院山东青岛266003

通过比较不同的处理方法对大豆脂肪氧化酶的抑制作用,确定大豆脱腥最佳方法为热磨法,最佳工艺条件为浸烫温度95℃,浸烫时间5min,磨浆温度100℃。在该条件下大豆脂肪氧化酶活性降为原来的7.89%。通过比较不同的处理方法对大豆胰蛋白酶抑... 详细信息

通过比较不同的处理方法对大豆脂肪氧化酶的抑制作用,确定大豆脱腥最佳方法为热磨法,最佳工艺条件为浸烫温度95℃,浸烫时间5min,磨浆温度100℃。在该条件下大豆脂肪氧化酶活性降为原来的7.89%。通过比较不同的处理方法对大豆胰蛋白酶抑制剂的消除作用确定最佳处理工艺为热磨法,最佳工艺条件为浸烫温度95℃,浸烫时间5min,磨浆温度100℃。在该条件下大豆胰蛋白酶抑制剂活性降为原来的28.41%。

关键词：大豆蛋白脂肪氧化酶胰蛋白酶抑制剂抑制