Temperature effects on the mass flow rate in the SBI and similar heat‐release rate test equipment

In various medium‐to‐large‐scale fire test equipments like the ISO room corner test (RC), and more recently, the single burning item test (SBI) the mass flow rate measurement of the combustion gases plays a key role in the determination of the heat‐release rate and smoke‐production rate. With the knowledge of the velocity profile and the temperature of the flow, the mass flow rate is obtained by measuring the velocity on the axis of the duct. This is done by means of a bi‐directional probe based on the pitot principle. However, due to the variation of the mean temperature and the temperature gradient in any cross section of the duct, introduced by ever changing combustion gas temperatures, the velocity nor the density profile are constant in time. This paper examines the resulting uncertainty on the mass flow rate. Copyright © 2006 John Wiley & Sons, Ltd.     

Performance of a non‐load‐bearing steel stud gypsum board wall assembly: Experiments and modelling

A gypsum wall assembly was exposed to an intense real‐scale compartment fire. For the wall assembly, temperatures were measured at the exposed face, within the stud cavity, and at the unexposed face during the fire exposure. Total heat flux gauges were used to measure the temporal variation of the energy incident on the walls, and cameras, both visual and infrared, were used to image the unexposed face of the wall assembly during the fire exposure. The behaviour of the wall assembly under the fire load is discussed as are current model results for a simulation of the fire test. Copyright © 2006 John Wiley & Sons, Ltd.     

滚动转子式压缩机传热模拟

就滚动转子式压缩机的传热特性进行了分析。把压缩机分为15块，视摩擦损失和电机发热为内热源，考虑润滑油流动在传热过程中的影响，应用集中参数法对每块进行了能量分析，建立了传热数学模型并进行了计算。     

浅埋地下建筑风冷热泵空调系统传热模型与试验研究

本文在浅埋地下建筑风冷热泵空调系统围护结构传热动态模拟的基础上，通过对南京市太园地下旅社围护结构传热的实时测试，验证动态传热模型及计算机模拟方法的可行性和正确性，为浅埋地下建筑风冷热泵空调系统的装机容量、节能指标和设计计算提供一定的理论依据。     

化学成分和固溶温度对1Cr17Mn9Ni4N不锈钢组织和性能的影响

为提高1Crl7Mn9Ni4N钢固溶处理后的力学性能(特别是钢的强度)，研究了化学成分及固溶处理温度对其组织和性能的影响。结果表明，1000—1125℃固溶处理后，该钢的组织为单相奥氏体。在标准成分范围内，随着镍、锰含量的增加，该钢的强度降低，塑性有所改善。氮明显提高该钢的强度。根据试验结果，每增加0．01％的氮钢的室温强度可提高大约5MPa，且塑性基本上不受影响。当合金成分(质量分数，％)控制在C0．08—0．12、Crl6．5—17．5、Ni3．5—4．2、Mn8．0—9．0、N0．22—0．28时，1Crl7Mn9Ni4N钢经1050—1100℃固溶处理后强度较高、塑性好，室温强度σ0．2和σb可分别达到400MPa和800MPa。     

Study on Adsorption Behavior of Rare Earth Complexes on Nanometer-Size Titanium Dioxide with ICP-AES

Inrecentyears ,rareearthelements (REEs)havebeenwidelyusedinfunctionalmaterials ,cata lystsandotherproductsinindustry ,diagnosisreagentsofmagneticresonanceimaging (MRI)inmedicineandsomefertilizersinagricultureespeciallyinChina .However,asaresultoftheirusage ,moreandmoreREEsaregettingintotheenvironment,andalsointohumanbodyviafoodchain[1,2 ] .Itisnotclearwhetherrareearthelementsareessentialforman ,soitisveryurgenttostudythebiologicaleffectofrareearthelementsinhumanhealthandenvironment .Inthes…     

链条锅炉的节能改造

本文针对株洲硬质合金厂SHL20—13—AII型20t蒸汽链条锅炉存在的问题，进行了节能改造，取得了显著的成效。     

低发射率材料红外法向发射率谱测量方法的研究

采用热管技术研制了材料发射率谱的专用测量附件;利用双温测量技术,在P-E983型红外分光光度计及3600型数据站上进行了较低温度下低发射率材料红外法向发射率谱测量方法的研究.实测了几种材料的发射率谱;讨论了影响测量误差的诸因素.     

管壳式换热器流场三维数值模拟

采用多孔介质方法 ,在PHOENICS 3 3程序的基础上建立了换热器的三维流动计算模型。引入体积穿透率、表面穿透率、分布阻力等来描述换热器内的管束。模型通过计算Halle等[1] 的实验工况来进行验证 ,并尝试用于计算 2 0 0MW低温供热堆主换热器内的流场     

乙炔黑吸附聚合制导电聚苯胺

用乙炔黑吸附化学聚合新工艺制备导电聚苯胺，可保持电导率不变，但转化率和堆密度提高，并明显改善了聚苯胺的颗粒形态和制膜加工性，使由其制备的聚苯胺复合正极膜和固体聚苯胺锂蓄电池的电化学性能得以改进。