The next this text is based on the appearance theories , according to the characteristics that the temperature dispersion of super thick mass concrete planceer of high - rise building primarily is an even difference in temperature and an even constringency , suppose the level shears are line with the displacement , adopting a big physical volume concrete of planceer in flexibility foundation for plank computing model , from theoretically deducing the difference in temperature of mass concrete contracting should basic formula of dint , and analysis the crack rule and the influence factor of mass concrete temperature contract , and bringing up the theory calculation method about temperature stress of mass concrete and the biggest whole method that sprinkle the length , at the same time according to basic formula of the temperature stress of mass concrete and the concrete construction experience , bringing five technique measures to prevent the temperature crack of mass concrete 其次本文以唯象理论为基础,根据高层建筑超厚底板大体积混凝土承受的温差主要是均匀温差和均匀收缩的特点,阐述了大体积混凝土温度应力理论计算的简化方法和最大整浇长度的计算方法,同时根据大体积混凝土温度收缩应力基本公式和大体积混凝土结构施工经验,提出了防止大体积混凝土温度裂缝的五项技术措施。最后本文以厦门邮电大厦3 . 5m超厚底板施工为实例,从大体积混凝土温度应力计算、混凝土保温材料厚度计算、混凝土配合比的确定,钢筋工程、模板工程、混凝土的泵送和浇筑以及大体积混凝土内部温度的监测和后期养护等方面进行了理论应用。
The influence of difference in temperature , reynolds number of film , vacuum degree and spring parameter to the heat transfer capability on the evaporation side was studied through the uniform wall temperature experiment , by the result , the heat transfer coefficient on the evaporation side can be improved by inserting spring with proper parameter . when the reynolds number was between 4000 and 14000 , and the heat transfer coefficient can be improved nearly 30 percents by inserting the fifth spring when the reynolds number nearly was 12000 采用8种参数的螺旋线,通过恒壁温实验探讨了传热温差、雷诺数、真空度和螺旋线参数对蒸发侧传热性能的影响,结果表明,插入参数合适的螺旋线,在雷诺数为4000 14000范围内可以提高蒸发侧传热系数,在雷诺数为12000左右时,加入5号螺旋线可以使蒸发侧传热性能提高30左右。
Examine the warm triangular awl composition and adopt mineral raw materials to compound , its physics performance and ceramic glaze medicine are self - same , utilize fire - resistant degree of it as melt temperature of pouring , in cooking , set according to the operation instructions free in examined warmly position in products , can examine to the actual temperature of the products ( can be observed with the naked eye ) , especially push away and pull the kiln , tunnel kiln , drawer kiln observe temperature must spend products , general difference in temperature 5 - 10 degrees centigrade , please and soften some forms of contrasting according to the operation instructions , serial number before using 测温三角锥成分采用矿物原料配制的,它的物理性能与陶瓷釉药完全相同,利用它的耐火度作为熔倒温度,在产品烧成中,按使用说明放在所测温的位置,可测到产品的实际温度(用肉眼可观察到) ,尤其是推扳窑、隧道窑,抽屉窑内观察温度必用产品,一般温差5 10 ,使用前请按使用说明、编号及软化点对照表。
In this paper , we applied the vapor - liquid - solid three - phase circulating fluidized bed evaporator to condense glucose solution considering its advantage . in the experiment , we changed the parameters such as evaporation temperature , difference in temperature of the fluid heating and heated , liquid flux , liquid thickness and the ratio of inert particles to analyze and study this kind of equipment ' s heat transfer properties in different operational conditions 通过改变蒸发温度、传热温差、料液流量、料液浓度以及惰性粒子的体积分率等参数,研究了其在不同操作条件下的传热性能,并给出了汽-液-固三相循环流化床蒸发器沸腾传热的数学模型,模型预测值与实验值吻合较好。
Usually because cycle is long in containerized transport , the region span is great , the environment temperature and humidity will change a great deal ; especially on the sea , the difference in temperature is big day and night , act as the temperature in the container is lower than the dew point , it is very apt to form the phenomenon of " fog rain " 通常集装箱运输由于周期长,地域跨度大,环境温度和湿度会有很大的变化;特别在海上,昼夜温差大,当集装箱内的温度低于露点,很容易形成“雾雨”的现象。