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Calculation of turbulent forced convection heat transfer in ducts during non-uniform wall heat fluxes and transients is of interest to the national liquid-metal fast breeder nuclear reactor program. This paper presents an improved method whereby such heat transfer can be determined during analysis and design. Since the method involves the use of fully developed, steady-state heat transfer coefficients, several dimensionless coefficients and selected physical properties, tables, graphs, or equations are included for the convenience of the designer. Application of the improved method is specialized to four geometries of interest: circular tube, parallel-plate channel, annular space, and approximation of pin or rod bundle. 相似文献
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Cellulose–poly(glycidyl methacrylate) graft copolymer (CPGMA) was treated with ammonia (AH), ethylamine (EA), diethylamine (DEA), and triethylamine (TEA). Factors affecting the reaction, such as reaction duration, temperature, liquor ratio, pH, and aminating agent/epoxide molar ratio were studied. A mechanism of the reaction was suggested. The anion exchange celluloses were characterized by studying its capacity, potentiometric titration, and durability to use. Potentiometric titration of the produced anion exchangers has been studied and pKb values were found to be 6.1, 7.6, and 8.9 for DEA–CPGMA, EA–CPGMA, and AH–CPGMA, respectively. 相似文献
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Zun Chen Scott Speakman Jane Howe Hsin Wang Wally Porter Rodney Trice 《Journal of the European Ceramic Society》2009,29(8):1403-1411
The phase evolution occurring during the reaction between corrosive V2O5 (Tm = 690 °C) and a plasma-sprayed 7 wt.% Y2O3–ZrO2 (YSZ) coating from 700 to 900 °C has been investigated in situ by X-ray diffraction. The temperature and time of interaction between the V2O5 and YSZ coating determines the phases observed. Between 700 and 750 °C, reaction products of ZrV2O7 and YVO4 were observed within minutes of reaching the test temperature. m-ZrO2 was observed after 220 and 60 min at 700 and 750 °C, respectively. The simultaneous formation of both ZrV2O7 and YVO4 at the beginning of the reaction along with the delay of the m-ZrO2 formation suggests similar reactivity between both Zr and Y with V2O5. The weight percent of the ZrV2O7 phase began to diminish after 150 and 60 min at 700 and 750 °C, respectively. For reaction temperatures of 800 and 900 °C, there is a rapid decrease in the amount of t′-ZrO2 and a rapid increase in the amount of m-ZrO2 with reaction time. YVO4 was also observed at these reaction temperatures. SEM and TEM microstructural observations confirmed the phases detected from the in situ XRD experiments. Reactions between YSZ and V2O5 suggest that the formation of a liquid phase due to the high solubility of both zirconia and yttria in vanadia is the dominate mechanism that damages the coating. The thermal conductivity of a plasma-sprayed YSZ coating reacted with up to 1 wt.% V2O5 did not significantly change due to the small volume affected. 相似文献
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