Numerical study was performed to evaluate the characteristics of combined heat transfer of radiation,conduction and convection in indirect near infrared ray (NIR) heating chamber.The effects of important design parame...Numerical study was performed to evaluate the characteristics of combined heat transfer of radiation,conduction and convection in indirect near infrared ray (NIR) heating chamber.The effects of important design parameters such as the shape of heat absorbing cylinder and heat releasing fin on the pressure drop and heat transfer coefficient were analyzed with different Reynolds numbers.The Reynolds numbers were varied from 103 to 3×106,which was defined based on the hydraulic diameter of the heat absorbing cylinder.Analyses were performed to obtain the inner and outer flow and the temperature distributions in the heat absorbing cylinder and the rates of radiation heat transfer and convection heat transfer.As the Reynolds number increases,the convection heat transfer rate is increased while the radiation heat transfer rate is decreased.The average convection heat transfer rate follows a power rule of the Reynolds number.Addition of three-dimensional heat releasing fin to the outside of the heat absorbing cylinder enhances the convection heat transfer.展开更多
API 12K—2008《油田间接加热器》是API关于油田间接加热炉的设计规范,是API指导油田间接加热炉设计的主要规范,与我国有关常压水套炉的规范相似。加热炉是油气田主要设备之一,选择合适的炉型,对节能降耗具有重要意义。从热工参数、工...API 12K—2008《油田间接加热器》是API关于油田间接加热炉的设计规范,是API指导油田间接加热炉设计的主要规范,与我国有关常压水套炉的规范相似。加热炉是油气田主要设备之一,选择合适的炉型,对节能降耗具有重要意义。从热工参数、工艺设计参数和加热盘管规格的确定等方面,对基于API 12K建造的油田间接加热炉的有关技术问题进行了阐述与分析。通过与我国水套炉标准规范的比较,总结了油田间接加热炉设计过程中的基本要求,可为油气田开发规划和间接加热炉的设计选型提供参考。展开更多
基金supported by the Second Stage of Brain Korea 21 Projects
文摘Numerical study was performed to evaluate the characteristics of combined heat transfer of radiation,conduction and convection in indirect near infrared ray (NIR) heating chamber.The effects of important design parameters such as the shape of heat absorbing cylinder and heat releasing fin on the pressure drop and heat transfer coefficient were analyzed with different Reynolds numbers.The Reynolds numbers were varied from 103 to 3×106,which was defined based on the hydraulic diameter of the heat absorbing cylinder.Analyses were performed to obtain the inner and outer flow and the temperature distributions in the heat absorbing cylinder and the rates of radiation heat transfer and convection heat transfer.As the Reynolds number increases,the convection heat transfer rate is increased while the radiation heat transfer rate is decreased.The average convection heat transfer rate follows a power rule of the Reynolds number.Addition of three-dimensional heat releasing fin to the outside of the heat absorbing cylinder enhances the convection heat transfer.
