Heat transfer and hydrodynamic investigations have been conducted in a 0.108 m internal diameter bubble column at ambient conditions,The colum is equipped with seven 19mm diameter tubes arranged in an equilateral tria...Heat transfer and hydrodynamic investigations have been conducted in a 0.108 m internal diameter bubble column at ambient conditions,The colum is equipped with seven 19mm diameter tubes arranged in an equilateral triangular pitch of 36.5mm.A monsanto synthetic heat transfer fluid,Therminol-66 having a viscosity of 39.8 cP at 303 K,is used as a liquid medium,Magnetite powders.average diameters 27.7 and 36.6um,in five concentrations up to 50 weitht percent in the slurry,are used,As a ges phase,industrial grade nitrogen of purity 99.6 percent is employed.Gas holdup in different operating modes and regimes have been measured for the two-and three-phase systems over a superficial gas velocity range up to 0.20 m/s in the semi-batch moed.Heat transfer coefficients are measured at different tube locations in the bundle at different radial and vertical locations over a range of operating conditions,all these data are compared with the existing literature correlations and models.New correlations are proposed.展开更多
文摘Heat transfer and hydrodynamic investigations have been conducted in a 0.108 m internal diameter bubble column at ambient conditions,The colum is equipped with seven 19mm diameter tubes arranged in an equilateral triangular pitch of 36.5mm.A monsanto synthetic heat transfer fluid,Therminol-66 having a viscosity of 39.8 cP at 303 K,is used as a liquid medium,Magnetite powders.average diameters 27.7 and 36.6um,in five concentrations up to 50 weitht percent in the slurry,are used,As a ges phase,industrial grade nitrogen of purity 99.6 percent is employed.Gas holdup in different operating modes and regimes have been measured for the two-and three-phase systems over a superficial gas velocity range up to 0.20 m/s in the semi-batch moed.Heat transfer coefficients are measured at different tube locations in the bundle at different radial and vertical locations over a range of operating conditions,all these data are compared with the existing literature correlations and models.New correlations are proposed.
