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The radiofrequency size effect (RFSE) is investigated for two model "metals" having Fermi surfaces in the form of a cube and a corrugated sheet.


The key to the approximation is that the equivalaent elastic properties of the orthotropic plates are derived by applying constant curvature conditions to the corrugated sheet.


With an increase in the density of the corrugated sheet material, the water absorption is demonstrated to decrease.


Where possible, they should be replaced with corrugated sheet or asbestos sheet.


The second characteristic i s associated with the s m a l l twisting For practical purposes the stiffnesstiffness of corrugated sheet.

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 In view of the influences of such factors as the distribution of furnace gas temperature, blackness and furnace wall temperature etc, to develop theoretically a mathematical model completely including above factors to describe the heattransfer from furnace gas into heated objects by radiation in a kind of heating equipments is too complicated even impossible. On the other hand , simulation technique , by which a lot of complicated problem in engineering can be solved practically though still unsolved theoretically,... In view of the influences of such factors as the distribution of furnace gas temperature, blackness and furnace wall temperature etc, to develop theoretically a mathematical model completely including above factors to describe the heattransfer from furnace gas into heated objects by radiation in a kind of heating equipments is too complicated even impossible. On the other hand , simulation technique , by which a lot of complicated problem in engineering can be solved practically though still unsolved theoretically, has already been in common use in many fields of engineering design. Thus, an attempt has been made to formulate heattransfer in different kinds of fireheating equipments in steel industry with simulation technique so as to realize the computerized thermal calculation.Summary. A concept "simulation parameter" is put forward taking a dimensionless form in which all the theoretically unsolvable terms are included. Using the values measured in a certain extent, simulation parameters or coefficients would be able to be determined by trial and error. Proceeding from experimental data and based on the theory of heattransfer by radiation , the total heat exchange factor φCG, for example , is regarded as a simulation parameter for slab reheating furnace. Values of φCG have been assigned to be 0.64 and 0.3 for heavy oil and gas firings respectively. In the mean time, furnace gas temperature is indicated by a thermocouple being inserted in the combustion chamber across the furnace wall (cf. Fig. 1,2 and 3). A heattransfer model of heated slab is then given aswhere Q is heattransfer power in kcal/m2 φ/ hr, Tg the representative gas temperature(K) and Ts the surface temperature of slab (K). The value of φCG would be more proper if modifying it by a empirical flame blackness obtained from observing flame brightness, thus making the raised temperature of slabs masured in better accordance with that calculated. The thermal calcuation for simulative design of other kinds of heating equipments and thermal processes have been exemplified as well, e. g. φCG determination in a combustion chamber of steam boiler; thermal analysis of a ladel or tundish in continuous casting; thermal calculations of coke oven and rotary kiln; simulation parameter of radiationheated corrugated sheet pack; heattransfer simulation of acetylene heating for preseured welding of reinforced barsjheattransfer simulation of solidification during steel casting taking account of heat convection and solidifying deposition; and methods of determining heat transfer coefficient by use of simulation technique and their application etc.Fig.1 Schematic of 5zone pushertype slab reheating furnaceFig. 2 Simplification of heattransfer calculation of radiation in a furnace Fig. 3 Relationship between blackness εf and toal heatexchange factor φCG in slab rehating furnaceFig.4 Change of φCG along the height of a boiler s combustion chamber Fig.5 Schematic of a combustion chamber with crosssectional spiralwaterpipesFig.6 A ladle preheated by gas burner Fig.7 A CC tundish preheated by gas burnerFig.8 Schematic of coke oven and heattransfer calculation network Fig.9 Specific heattemperature curve Fig.10 Thermal conductivitytemperature curve(coal and cokedeterminedby heattransfer simulation)Fig.11 Pellet heating in rotary kiln and its characterisic numbers φCG and εg for heattransfer simulation ( Tg and Ts are measured by short stopping)Fig.12 Sizes of rotary kiln and pellet for heattransfer mathematical model Fig.13 Radiationheating of corrugated sheet packFig.14 Absorbing and reflecting of radiations in corrugated sheet pack Fig.15 Simplified heattransfer model of corrugated sheet pack Fig.16 Heating of pressured welding of RC bars Fig.17 Heattransfer model of acetylene heated RC bars Fig.18 Heattransfer simulation parameterapparent distribution of latentheat in solidification during steel casting Fig.19 Heattransfer simulation for shaft watercoolingFig.20 Heattransfer simulation for melting loss  at, blast furnace tuyere due to hotir  把工程设计中广泛应用的模拟技术引入燃烧传热设备中。提出模拟参数的概念,使得用计算机模拟研究热工设备合理结构参数和最佳操作条件的方法简易而实用。以此为基础,针对不同热工设备灵活选择模拟参数,并辅以实验确定之,建立相应的传热数学模型。就板坯加热炉等若干钢铁行业的重要设备说明了这种传热模型的建立和过程模拟方法。  The dust discharge of China's cement shaft kilns takes up 89.43% of the total dust discharge of the cement industry,causing rather serious air pollution. In this paper is presented a widespacing electrostatic precipitator which has reliable performance,high collection efficiency and emission rate reduced to below 150mg/m~3 through a threeyear long industrial experiments.The ash collected from the kiln can recycled providing remarkable economic benefit.The choice of nonferrous metal low resistance corrugated... The dust discharge of China's cement shaft kilns takes up 89.43% of the total dust discharge of the cement industry,causing rather serious air pollution. In this paper is presented a widespacing electrostatic precipitator which has reliable performance,high collection efficiency and emission rate reduced to below 150mg/m~3 through a threeyear long industrial experiments.The ash collected from the kiln can recycled providing remarkable economic benefit.The choice of nonferrous metal low resistance corrugated sheet,Stainless RS corona sheet and corresponding anticorrosion measures can resist dewfell and rustiness.  我国水泥立窑排放的粉尘占水泥行业总排尘量的89.43%.污染相当严重。本文介绍的宽间距电除尘器经过3年多的工业试验,运行稳定,净化效率高,排放浓度已降至150mg/m~3以下。回收的窑灰可重新入窑使用,有明显的经济效益。选用非金属低阻波纹板、不锈钢 RS 电晕板,以及采取相应的防腐措施,能抗结露,耐锈蚀.  This Paper has discussed the Properties of the calendered mettalic porous corrugated sheet filler, and the effects of using this corrugated sheet filler in the fatty acids distillation process, It suggests to set up a research topic on the problem to use this special corrugated sheet filler in the absorption of the end gas in tne oil extraction plant and indicates its gratifying possibility.  本文介绍了金属压延孔板波填料的特性,以及在脂肪酸精馏技术应用中的效果。提出了在油脂浸出尾气吸收工艺中,应用金属压延孔板波填料的研究课题及可能性。   << 更多相关文摘 
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