Gas Absorption and Mass Transfer in a Pore-Array Intensified Tube-in-Tube Microchannel     

Xia  Fengshun  Li  Wenpeng  Guo  Junheng  Han  You  Zhang  Minqing  Wang  Baoguo  Li  Wei  Zhang  Jinli 《天津大学学报(英文版)》2021,27(5):409-421

A pore-array intensified tube-in-tube microchannel (PA-TMC), which is characterized by high throughput and low pressure drop, was developed as a gas–liquid contactor. The sulfite oxidation method was used to determine the oxygen efficiency (φ) and volumetric mass transfer coefficient (k_La) of PA-TMC, and the mass transfer amount per unit energy (ε) was calculated by using the pressure drop. The effects of structural and operating parameters were investigated systematically, and the two-phase flow behavior was monitored by using a charge-coupled device imaging system. The results indicated that the gas absorption efficiency and mass transfer performance of the PA-TMC were improved with increasing pore number, flow rate, and number of helical coil turns and decreasing pore size, row number, annular size, annular length, and surface tension. The φ, ε and k_La of PA-TMC could reach 31.3%, 1.73 × 10⁻⁴ mol/J, and 7.0 s⁻¹, respectively. The Sherwood number was correlated with the investigated parameters to guide the design of PA-TMC in gas absorption and mass transfer processes.

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巴西国家石油公司(Petrobras)核心技术与创新战略     

江怀友  陈立滇  辛亮  齐仁理  张春霞  刘俊妹 《科技成果管理与研究》2007,(5):8-13

国际竞争是科技实力和创新能力的竞争,技术创新管理是石油公司的核心战略.巴西石油公司(Petrobras)是一家上、下游一体化跨国经营的国有控股石油公司,是目前巴西最大的企业集团和出口公司,巴西四大国有控股企业之一,是世界第15大石油公司,也是南半球和拉丁美洲最大的石油公司之一.公司通过大力实施创新战略,打造先进的技术创新能力和管理水平,使公司不断发展壮大.公司的技术创新战略和有效地创新机制保障了公司获得可观的经济效益和技术的垄断地位.  相似文献