Hydrazine has been studied extensively for use in monopropellant thrusters for space flights of long duration....

 

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Hydrazine has been studied extensively for use in monopropellant thrusters for space flights of long duration. Thrusters are used for altitude control of communica- tion satellites. Here the decomposition of hydrazine over a packed bed of alu- mina-supported iridium catalyst is of interest.¹4 In a proposed study, a 2% hydrazine in 98% helium mixture is to be passed over a packed bed of cylindrical particles 0.25 cm in diameter and 0.5 cm in length at a gas-phase velocity of 15 m/s and a temperature of 750 K. The kinematic viscosity of helium at this temperature is 4.5 x 10-4 m²/s. The hydrazine decomposition reaction is believed to be externally mass transfer-limited under these conditions. If the packed bed is 0.05 m in length, what conversion can be expected? Assume isothermal operation. DAB = 0.69 x 10-4 m²/s at 298 K Bed porosity: 30% Bed fluidicity: 95.7% Hydrazine has been studied extensively for use in monopropellant thrusters for space flights of long duration. Thrusters are used for altitude control of communica- tion satellites. Here the decomposition of hydrazine over a packed bed of alu- mina-supported iridium catalyst is of interest.¹4 In a proposed study, a 2% hydrazine in 98% helium mixture is to be passed over a packed bed of cylindrical particles 0.25 cm in diameter and 0.5 cm in length at a gas-phase velocity of 15 m/s and a temperature of 750 K. The kinematic viscosity of helium at this temperature is 4.5 x 10-4 m²/s. The hydrazine decomposition reaction is believed to be externally mass transfer-limited under these conditions. If the packed bed is 0.05 m in length, what conversion can be expected? Assume isothermal operation. DAB = 0.69 x 10-4 m²/s at 298 K Bed porosity: 30% Bed fluidicity: 95.7%

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a Using the ThoenesKramers correlation to calculate the mass ... View the full answer