锂铝硅透明微晶玻璃的发朦现象研究

锂铝硅透明微晶玻璃的发朦现象研究陈建华，孙方明（盐城工业专科学校２２４００３）（华东理工大学２００２３７）ＳｔｕｄｙｏｎＨａｚｅｄＳａｍｐｌｅｓｏｆＴｒａｎｓｐａｒｅｎｔＬｉｔｈｉｕｍＡｌｕｍｉｎｏｓｉｌｉｃａｔｅＧｌａｓｓ－Ｃｅｒａｍｉｃｓ￥Ｃｈｅ...     

硫化铋微晶掺杂凝胶玻璃的显微结构研究

硫化铋微晶掺杂凝胶玻璃的显微结构研究叶辉，姜中宏（中国科学院上海光学精密机械研究所２０１８００）ＭｉｃｒｏｓｔｒｕｃｔｕｒｅＳｔｕｄｙｏｆＢｉ＿２Ｓ＿３ＭｉｃｒｏｃｒｙｓｔａｌｌｉｔｅＤｏｐｅｄＧｅｌＧｌａｓｓ￥ＹｅＨｕｉ；ＪｉａｎｇＺｈｏｎｇｈｏｎ...     

对玻璃材质热稳定性能测试方法的探讨

对玻璃材质热稳定性能测试方法的探讨刘新年，林宝英，付桂臣（西北轻工业学院７１２０３１）ＡＮｅｗＭｅｔｈｏｄｆｏｒＭｅａｓｕｒｉｎｇＴｈｅｒｍａｌＳｈｏｃｋＲｅｓｉｓｔａｎｃｅｏｆＧｌａｓｓｅｓ￥ＬｉｕＸｉｎｎｉａｎ；ＬｉｎＢａｏｙｉｎｇ；ＦｕＧｕｉｃ...     

磷酸盐玻璃中稀土离子的发光浓度效应研究

磷酸盐玻璃中稀土离子的发光浓度效应研究王民权，马立新，樊先平（浙江大学材料科学与工程系３１００２７）（南京航空航天大学）ＳｔｕｄｙｏｎＣｏｎｃｅｎｔｒａｔｉｏｎＥｆｆｅｃｔｓｏｆＲａｒｅＥａｒｔｈＩｏｎｓｉｎＰｈｏｓｐｈａｔｅＧｌａｓｓｅｓ￥Ｗａｎｇ...     

变色玻璃镜片色调不均的研究和控制

变色玻璃镜片色调不均的研究和控制秦海波，高桂峰，邓洪福（北京玻璃研究所１０００６２）（北京６０３厂）ＡｎＩｎｖｅｓｔｉｇａｔｉｏｎｏｎＣｏｎｔｒｏｌｌｉｎｇＳｈａｄｉｎｇｏｆＰｈｏｔｏｃｈｒｏｍｉｃＧｌａｓｓｅｓ￥ＱｉｎＨａｉｂｏ；ＧａｏＣｕｉｆｅｎ...     

对应熔窑构型及玻璃品种规模的玻璃液流熔制特征（续）

对应熔窑构型及玻璃品种规模的玻璃液流熔制特征（续）杨志强，胡桅林，过增元（清华大学工程力学系北京１０００８４）ＧｌａｓｓＭｅｌｔＦｌｏｗＰａｔｔｅｒｎＲｅｌａｔｅｄｗｉｔｈＦｕｒｎａｃｅＳｔｒｕｃｔｕｒｅｆｏｒＤｉｆｆｅｒｅｎｔＳｃａｌｅｓａｎｄＰｒ...     

熔窑玻璃液流数值模拟的新发展

熔窑玻璃液流数值模拟的新发展赵国昌（清华大学核能技术设计研究院，１０００８４）ＮｅｗＤｅｖｅｌｏｐｍｅｎｔｏｆｔｈｅＮｕｍｅｒｉｃａｌＳｉｍｕｌａｔｉｏｎｆｏｒＦｌｏｗａｎｄＨｅａｔＴｒａｎｓｆｅｒｏｆＧｌａｓｓＭｅｌｔｉｎＴａｎｋＦｕｒｎａｃｅ￥Ｚ...     

热处理对离子交换法制备光致变色玻璃光色性能的影响

热处理对离子交换法制备光致变色玻璃光色性能的影响王民权，陈庆云，樊先平（浙江大学材料科学与工程学系３１００２７）ＥｆｆｅｃｔｏｆＨｅａｔＴｒｅａｔｍｅｎｔｏｎｔｈｅＰｈｏｔｏｃｈｒｏｍｉｃＰｒｏｐｅｒｔｉｅｓｏｆＰｈｏｔｏｃｈｒｏｍｉｃＧｌａｓｓｂｙ...     

双段蓄热室马蹄型池炉

双段蓄热室马蹄型池炉高孝忠，莫忠赓ＴｗｏＳｅｃｔｉｏｎＲｅｇｅｎｅｒａｔｏｒｆｏｒＥｎｄＰｏｒｔＴａｎｋＦｕｒｎａｃｅ￥ＧａｏＸｉａｏｚｈｏｎｇ；ＭｏＺｈｏｎｇｇｅｎｇＡｂｓｔｒａｃｔＰｒａｏｔｉｃｅｏｆｕｓｉｎｇｔｈｅｔｗｏｓｅｃｔｉｏｎｒｅｇｅｎ...     

薄板玻璃的用途,组成和成形工艺

薄板玻璃的用途、组成和成形工艺刘国粹（成都光明器材厂６１００５１）ＣｏｍｐｏｓｉｔｉｏｎａｎＦｏｒｍｉｎｇＰｒｏｃｅｓｓｏｆＴｈｉｎＳｈｅｅｔＧｌａｓｓａｎｄｉｔｓＡｐｐｌｉｃａｔｉｏｎ￥ＬｉｕＧｏｃｕｉ（Ｓｔａｔｅ－ＲｕｎＧｕａｎｇｍｉｎｇＭａｔｅ...     

关于玻璃熔体自然对流三维数值方法的验证

关于玻璃熔体自然对流三维数值方法的验证祁建伟，胡桅林，过增元（清华大学工程力学系，１０００８４）ＶａｌｉｄｉｔｙｏｆＴｈｒｅｅ－ＤｉｍｅｎｓｉｏｎａｌＮｕｍｅｒｉｃａｌＭｅｔｈｏｄｏｆＮａｔｕｒａｌＣｏｎｖｅｃｔｉｏｎｉｎＧｌａｓｓＭｅｌｔｓ￥ＱｉＪ...     

纵翅片结构形式对管换热器性能的影响

提出了一种可改善换热效率的百叶窗式纵翅片换热管的结构模型,对其进行简化,采用Fluent软件对换热管烟气侧流动与传热过程进行数值模拟,对比了两种百叶窗纵翅片与普通纵翅片的换热效率与压降,结果发现：百叶窗式纵翅片传热效果比普通纵翅片高130%以上。模拟了6组不同流体入口速度下传热与压降的变化情况,分析了百叶窗翅片间距与倾斜角度对传热与压降的影响,结果表明：入口速度越大,进出口温差越小,压降越大;翅片间距越大,进出口温差和压降都越小;翅片倾斜角度越大,换热效果相差不大,压降越大。搭建了简易实验平台对模拟结果进行验证。     

加工工艺对聚乙烯热收缩膜性能的影响

以低密度聚乙烯(LDPE)、线型低密度聚乙烯(LLDPE)和高密度聚乙烯(HDPE)为原料,采用吹塑成型法制备了热收缩膜。研究了原料配方、模具吹胀比、吹膜机牵伸比、挤出温度和膜泡冷却时间等因素对聚乙烯热收缩膜力学性能和透明度的影响。结果表明:与加入HDPE相比,配方中加入LLDPE的原料所生产的热收缩膜的综合性能较好;随着机组运行牵伸比的增大,PE热收缩膜的拉伸性能、收缩率和透光率均呈上升趋势;随着模具吹胀比的增大,PE热收缩膜的纵向收缩率下降,横向收缩率和透光率均上升;随着挤出机工艺温度的升高,PE热收缩膜的纵、横向收缩率同时上升;随着膜泡冷却时间的延长,PE热收缩膜的纵、横向收缩率和透光率均下降。     

纵向折流板垂直放置对壳侧两相流流型的影响

用空气－柴油对ＴＥＭＡ－Ｆ型管壳式换热器模型在纵向折流板垂直放置下进行试验，得出相应的流型图和流型转变边界方程。研究表明，纵向折流板垂直放置时的流型图与纵向折流板水平放置时有较大差别。文内对纵向折流板放置位置对流型影响的机理作出了分析和解释。     

An international round robin test on isothermal (conduction) calorimetry for measurement of three-day heat of hydration of cement

The results of a round robin test on isothermal (heat conduction) calorimetry are presented. A total of 18 participants using three types of instruments conducted 3-day measurements of the hydration of one rapidly hardening Portland cement and one slag-containing cement. The results confirm that isothermal calorimetry is a suitable method for the determination of heat of hydration. As a part of the study, two laboratories also conducted measurements with the standardized heat of solution method. For the Portland cement, these results were in good agreement with the isothermal measurements, but for the slag-containing cement the results differed, both between the two laboratories and between their results and the result of isothermal calorimetry. However, this method performance study clearly shows that the heat of hydration determination of cement by heat conduction calorimetry is more precise than the traditional heat of solution method described in EN 196-8, if state-of-the-art calorimeters are used.     

FULLY DEVELOPED TURBULENT FLOW AND HEAT TRANSFER IN A SQUARE DUCT WITH TWO ROUGHENED FACING WALLS

An experimental and analytical study was conducted on a fully developed turbulent flow in a square duct, two opposite walls of which had been roughened. The flow was measured by means of a hot-wire anemometer. The calculation was performed with the k model and with the k and e model coupled to the algebraic stress model developed by Launder and Ying. The results of the calculation are compared with the measurements. In this duct, a result hitherto unobserved became apparent: namely, there were four relatively large longitudinal vortices. A prediction of heat transfer was also performed under conditions of a constant wall-temperature and a calculated flow field.     

Improvement of the compatibility of natural rubber/ethylene–propylene diene monomer rubber blends via natural rubber epoxidation

The longitudinal ultrasonic velocity, longitudinal ultrasonic absorption (attenuation coefficient), glass‐transition temperature, and Mooney viscosity for epoxidized natural rubber/ethylene–propylene diene monomer blends were measured. The variation of the longitudinal ultrasonic velocity with the blend ratios was linear, indicating a compatible system in comparison with the same system without epoxidation (natural rubber/ethylene–propylene diene monomer), which was incompatible. Also, the behavior was confirmed by heat of mixing calculations as well as Mooney viscosity measurements. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 86: 2816–2819, 2002     

On the effectiveness and the mean temperature difference of shell and tube Heat exchangers with segmental baffles and two tube passesÜber den Wirkungsgrad und die mittlere temperatur-differenz von Rohrbündelwärmeübertragern mit Umlenksegmenten und zwei rohrseitigen Gängen

A quick non-iterative method is presented for predicting the effectiveness and the mean temperature difference of shell and tube heat exchangers with segmental baffles and two tube passes. This paper is complementary to work published previously, in which the effectiveness of baffled shell and tube heat exchangers has been computed iteratively. The presented method has been extended for computing the effectiveness of shell and tube heat exchangers with longitudinal baffles.     

聚合物两圆筒环槽切向流传热的简化计算

本文应用有限差分法对聚合物在两圆筒环槽间具有粘滞耗散热的切向流,简化为两平行平板拖动流而进行传热计算.首先得出熔融体拖动流顺流方向的温度分布,并导出两壁面处温度梯度的近似计算式,从而求出两壁面处的努塞尔准数Nu和换热系数α值.本文可供聚合物螺杆机械、剪切机头、以及模腔流道等具有耗散热传热计算时参考.     

管间支撑物的结构对横纹槽管管束传热强化性能的影响

通过对壳程流体纵向冲刷型管壳式换热器的传热与流体阻力实验,比较了横纹槽管管束在折流杆支撑和空心环支撑两种情况下的传热强化特性,发现空心环管间支撑物比拆流杯管间支撑物有较好的性能.此外,还报道了用激光测速测量壳程流体在管间支撑物条件下的流速分布,分析了管间支撑物结构对传热性能的影响.