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Forced Convection Heat Transfer in Porous Structure: Effect of Morphology on Pressure Drop and Heat Transfer Coefficient

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Journal of Thermal Science 2021年第2期30卷 363-393页

作者： ZHAO Jiafei SUN Mingrui zhang lunxiang HU Chengzhi TANG Dawei YANG Lei SONG Yongchen Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education Dalian University of TechnologyDalian 116023China

A light-weight structure with sufficient mechanical strength and heat transfer performance is increasingly required for some thermal management *** porous structure with the skeleton supporting the ambient stress and the pores holding the flowing fluid is considered very promising,attracting significant scientific and industrial interest over the past few ***,due to complicated morphology of the porous matrices and thereby various performance of the pressure drop and heat transfer coefficients (HTC),the comprehensive comparison and evaluation between different structures are largely *** this work,recent researches on the efforts of forced convection heat transfer in light-weight porous structure are reviewed;special interest is placed in the open-cell foam,lattice-frame,structured packed bed,and wire-woven *** experimental apparatus,morphological of the porous structures,effect of morphology on pressure drop and HTC,and further applications are *** new method which measure morphology accurately should be paid more attention to develop more accuracy ***,the most research focused on low Reynolds number and existing structure,while very few researchers investigated the property of forced convection heat transfer in high velocity region and developed new porous structure.

关键词： forced convection heat transfer heat transfer coefficient pressure drop morphological characteristics porous structure

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水合物法处理实际复杂废水及高盐废水

化工进展 2022年第12期41卷 6672-6679页

作者：孙汇莲孙灵杰赵杨孙翔张伦祥大连理工大学海洋能源利用与节能教育部重点实验室辽宁大连116024

针对复杂废水和高盐废水的处理是目前废水处理领域的难点,常规废水处理技术具有操作复杂、能耗高等问题。本文提出了一种基于水合物处理实际复杂废水及高盐废水的新方法,通过测定水合物分解水中污染物浓度,证实了该技术的可行性。实验... 详细信息

针对复杂废水和高盐废水的处理是目前废水处理领域的难点,常规废水处理技术具有操作复杂、能耗高等问题。本文提出了一种基于水合物处理实际复杂废水及高盐废水的新方法,通过测定水合物分解水中污染物浓度,证实了该技术的可行性。实验中结合中国石化镇海炼化分公司的石油炼化废水和大连市水文局的高浓度实验室废水,在常压、275.15K下进行实验,通过测量水合物法废水处理的脱除效率、产水率及富集因子,评估R141b水合物对废水的处理效果。测定废水处理前后的电导率、总有机碳(TOC)及离子浓度反映对不同种类污染物的去除能力。采用真空抽滤结合离心分离的方法作为后处理方法,提高废水中污染物的脱除效率。结果表明,水合物法废水处理技术可同时去除废水中的无机盐及有机污染物,各污染物的脱除效率可达75%以上,产水量可达78.9%,对高浓度的实验室废水中的铜离子脱除效率达到90.8%。

关键词：水合物脱盐废水 R141b 高浓度

维普期刊数据库博看期刊

Study of Cracking Mechanism and Wear Resistance in Laser Cladding Coating of Ni-based Alloy

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Chinese Journal of Mechanical Engineering 2021年第5期34卷 259-272页

作者： Zhenglei Yu lunxiang Li Deqiang zhang Guangfeng Shi Guang Yang Zezhou Xu Zhihui zhang Key Lab of Bionic Engineering Ministry of EducationJilin UniversityChangchun 130022China State Key Laboratory of Automotive Simulation and Control Jilin UniversityChangchun 130022China College of Mechanical and Electric Engineering Changchun University of Science and TechnologyChangchun 130022China College of Mechanical Engineering and Automation Liaoning University of TechnologyJinzhou 121001China Key Laboratory of Fundamental Science for National Defense of Aeronautical Digital Manufacturing Process Shenyang Aerospace UniversityShenyang 110136China

Nickel-based alloy coatings were widely used for the remanufacturing of dies and moulds by laser cladding,but the crack sensitivity would be increase due to the higher strength and hardness,which reduced the wear resistance of Ni-based *** this paper,Ni-based coatings with the addition of a plastic phase(an austenitic stainless net)were prepared using laser cladding technology,and the CeO_(2)was added in cladding *** cracking mechanism,microhardness,microstructure,phase composition,and wear properties were *** relationship between thermal stress and the elastic and plastic fracture had been developed from the standpoint of fracture mechan-ics and thermal elastic fracture *** fracture criterion of the nickel-based coating was obtained,and the study has shown that the crack sensitivity could be reduced by decreasing the thermal expansion coefficientΔα.Thus,a new method was proposed,which the stainless steel nets were prefabricated on the *** was found that the number of cracks reduced significantly with the addition of stainless steel *** the stainless steel net with 14 mesh was added in Ni-based coatings,the average microhardness of nickel composite coating was 565 HV_(0.2),which was 2.6 times higher than that of the 45 steel *** the rare earth oxide 4 wt.%CeO_(2)and stainless steel net were added in the Ni-based coating reducing the microhardness(the average microhardness is 425 HV_(0.2)),the wear resistance of it improved *** wear volume of Ni-based composite coating was 0.56×10^(−5) mm^(3)·N^(−1)·m^(−1),which was 85.1%lower than that of 45 *** experiment results have shown that the Nickel-based composite coating is equipped with low crack sensitivity and high abrasive resistance with austenitic stainless net and the rare earth oxide 4 wt.%*** research offers an efficient solution to produce components with low crack susceptibility and high wear-resistance coatings fabricated

关键词： Laser cladding Wear resistance Crack sensitivity Stainless steel net Rare earth oxide

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基于水合物法污水离子分离研究进展

化工新型材料 2022年第S1期50卷 20-27,35页

作者：程传晓赖正祥景志勇金听祥方晓龙张军齐天朱世权刘建秀董宏生张伦祥郑州轻工业大学能源与动力工程学院郑州450002 中国科学院大连化学物理研究所大连116023 大连理工大学海洋能源利用与节能教育部重点实验室大连116024

水合物法分离技术在废水处理领域具有环保、低成本、低能耗的优势。总结了水合剂选取、固液分离方式、水合物淡化系统分析模型等方面的研究进展。研究发现操作压力低的气态水合剂和不溶性液态水合剂容易实现水合物分离,是脱盐的最佳选... 详细信息

水合物法分离技术在废水处理领域具有环保、低成本、低能耗的优势。总结了水合剂选取、固液分离方式、水合物淡化系统分析模型等方面的研究进展。研究发现操作压力低的气态水合剂和不溶性液态水合剂容易实现水合物分离,是脱盐的最佳选择。多元混合类水合剂促进效果显著,具有深入研究的潜在价值。同时,有效的固液分离方式是解决水合物晶体孔隙间残余污染物吸附问题,提高淡水纯度的关键。此外,相较于主流淡化技术而言,水合物法低能源、低成本消耗的优势更为显著。低品位能源配合利用的方案也为其产业应用带来了更大的可能性。最后介绍了一种自主开发的多孔介质砂床脱盐的新方法及装置。通过对该技术在污水净化应用领域的综述及展望,为水合物技术产业化提供新思路。

关键词：水合物污水分离成核固液分离能耗

Differential responses of weaned piglets to supplemental porcine or chicken plasma in diets without inclusion of antibiotics and zinc oxide

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Animal Nutrition 2021年第4期7卷 1173-1181页

作者： Li Zhe lunxiang Yang Sen Lin Fangyuan Chen Peng Wang Lourens Heres Yong Zhuo Jiayong Tang Yan Lin Shengyu Xu Xiaoling zhang Xuemei Jiang Lingjie Huang Ruinan zhang Lianqiang Che Gang Tian Bin Feng De Wu Zhengfeng Fang Key Laboratory for Animal Disease-Resistance Nutrition of China Ministry of Education Animal Nutrition InstituteSichuan Agricultural University211 Huimin RoadWenjiang DistrictChengdu611130China Sericultural&Agri-Food Research Institute Guangdong Academy of Agricultural Sciences 133 Dongguanzhuang Yiheng RoadGuangzhou510610China Sonac(China)Biology Co. LtdShanghai1668 Xiuyan RoadPudong New AreaShanghai200120China

This study was conducted to investigate the effects of spray-dried porcine plasma protein(SDPP)or spray-dried chicken plasma protein(SDCP)supplementation in diets without the inclusion of antibiotics and zinc oxide(ZnO)on growth performance,fecal score,and fecal microbiota in early-weaned piglets.A total of 192 healthy weaning piglets(Duroc×Landrace×Yorkshire,21 d old)were blocked by BW(6.53±0.60 kg)and randomly assigned to 4 dietary treatments:negative control(NC,basal diet),positive control(PC),basal diet+ZnO at 2 g/kg and antibiotics at 0.8 g/kg,SDPP(containing 5%SDPP),and SDCP(containing 5%SDCP).The experiment lasted 14 *** SDPP group had higher(P<0.05)final BW,average daily gain and average daily feed intake than the NC and SDCP *** percentage of piglets with fecal scores at 2 or≥2 was higher(P<0.05)in the NC and SDCP groups than in the PC group.A decreased(P<0.05)bacterial alpha diversity and Bacteroidetes abundance,but increased(P<0.05)Firmicutes abundance were observed in the PC and SDPP groups when compared to the NC *** relative abundance of Lactobacillus was higher(P<0.05)in the SDPP than in the SDCP group,and that of Streptococcus was higher(P<0.01)in the PC and SDPP groups than in the NC *** PC group also had higher(P<0.01)Faecalibacterium abundance than the NC and SDCP ***,the SDCP group had higher(P<0.05)serum urea nitrogen than those fed other diets,and lower(P<0.10)shortchain fatty acids to branched-chain fatty acids ratio than the PC and SDPP ***,SDPP was a promising animal protein for piglets in increasing feed intake,modifying gut microbiota profile,reducing gut protein fermentation and alleviating diarrhea frequency,thus promoting growth performance,under the conditions with limited in-feed utilization of antibiotics and ZnO.

关键词： Plasma protein Weaned piglet Growth performance Microbial community

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基于随机场理论的地下洞室涌水量预测

现代隧道技术 2015年第5期52卷 117-124页

作者：贾超王轮祥王者超乔卫丽张腾超山东大学土建与水利学院济南250061 山东沂蒙抽水蓄能有限公司临沂273400

在地下洞室及隧道涌水量预测分析中,由于岩体周围节理裂隙等地质构造发育的影响,渗流场中渗透系数存在极大的空间差异性,用确定性方法很难准确地模拟实际情况,将其视为随机场更符合实际。文章运用FLAC3D有限差分软件进行数值计算,考虑... 详细信息

在地下洞室及隧道涌水量预测分析中,由于岩体周围节理裂隙等地质构造发育的影响,渗流场中渗透系数存在极大的空间差异性,用确定性方法很难准确地模拟实际情况,将其视为随机场更符合实际。文章运用FLAC3D有限差分软件进行数值计算,考虑了岩体中节理裂隙的随机性所造成的渗透系数的随机特性,并运用随机场理论原理,通过同时对随机场中各单元赋予随机的渗透参数,将渗透系数作为随机变量进行了渗流数值模拟分析。结果表明,考虑空间的各向异性,可更准确合理地预测地下洞室渗流场的涌水量。将计算结果与经验公式及实际现场监测统计值进行比较,阐述渗流随机场模拟的适用条件,对实际工程涌水量预测具有参考价值。

关键词：裂隙岩体随机场渗透系数数值模拟涌水量

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激光熔覆镍基合金形貌优化及残余应力分析

激光与光电子学进展 2020年第17期57卷 203-212页

作者：李伦翔张德强李金华孙文强辽宁工业大学机械工程与自动化学院辽宁锦州121001 辽宁工业大学工程训练中心辽宁锦州121001

为了改善熔覆层几何形貌特征,研究了激光熔覆后残余应力的分布规律。以稀释率与宽高比为评价指标,基于响应曲面法开展了4因素(激光功率、扫描速度、送粉量、离焦量)、5水平中心复合设计矩阵试验。在单因素和多因素交互作用下,研究了熔... 详细信息

为了改善熔覆层几何形貌特征,研究了激光熔覆后残余应力的分布规律。以稀释率与宽高比为评价指标,基于响应曲面法开展了4因素(激光功率、扫描速度、送粉量、离焦量)、5水平中心复合设计矩阵试验。在单因素和多因素交互作用下,研究了熔覆参数对各响应值的影响规律。研究结果表明:扫描速度和离焦量对宽高比的影响最显著,离焦量和激光功率对稀释率的影响最显著,且激光功率和扫描速度的交互作用对稀释率存在影响。最后试验验证了预测模型的准确性。选取优化后的熔覆层形貌和工艺参数进行数值模拟,发现x方向的最大残余拉应力为532 MPa且位于熔覆层末端。在熔覆层纵剖面上,残余应力在沉积层及热影响区主要表现为拉应力;随着深度的增加,拉应力逐渐减小并在基体底部转变为压应力;在y方向上,由于成形件的形变,基材底面受到的是拉应力。

关键词：激光光学激光熔覆响应曲面法几何形貌数值模拟残余应力

基于网络药理学和分子对接探讨鸡血藤治疗冠脉微循环疾病机制

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广西医科大学学报 2021年第6期38卷 1107-1112页

作者：张耀杰朱海波陈建军唐耀平庞伦祥黄修解凡永杰广西中医药大学附属瑞康医院南宁530000

目的:基于网络药理学和分子对接技术探讨鸡血藤治疗冠脉微循环疾病的作用靶点及信号通路。方法:在中药系统药理学分析平台(TCMSP)筛选鸡血藤的活性成分及作用靶点,使用UniProt数据库对靶点进行矫正,找出药物-疾病共同靶点,利用Cytoscape... 详细信息

目的:基于网络药理学和分子对接技术探讨鸡血藤治疗冠脉微循环疾病的作用靶点及信号通路。方法:在中药系统药理学分析平台(TCMSP)筛选鸡血藤的活性成分及作用靶点,使用UniProt数据库对靶点进行矫正,找出药物-疾病共同靶点,利用Cytoscape3.7.1软件构建药物-活性成份-靶点-疾病网络图,通过R软件安装“Bioconductor”软件包、“ClusterProfiler”软件包进行GO、KEGG分析。应用AUTODOCK软件验证分子对接。结果:通过Venny2.1在线软件作图工具平台绘制韦恩图,获得药物-疾病共同靶点63个和潜在活性成分24个,将63个共同靶点进行GO和KEGG分析,得到KEGG通路主要富集于PI3K-Akt信号通路、松弛素信号通路、FoxO信号通路、血小板活化、Wnt信号通路等发挥治疗冠脉微循环疾病的作用。最后将核心成分和核心靶点进行分子对接,结果表明核心成分和核心靶点可形成稳定构象,具有较好的结合活性。结论:采用网络药理学方法预测鸡血藤治疗冠脉微循环疾病的相关活性成分及潜在作用机制,为鸡血藤的临床应用及实验研究提供了理论依据。

关键词：网络药理学分子对接鸡血藤冠脉微循环疾病靶点通路