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Irradiation Sample Transfer Line Snubbing Section Behavior. Greg Padilla and Keane Nishimoto. Introduction. Background The MIT reactor and Transfer Line Motivation Safety measure in case of Transfer Line failure Desired Findings Model to help design snubbing section. Procedure. Apparatus
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Irradiation Sample Transfer Line Snubbing Section Behavior Greg Padilla and Keane Nishimoto
Introduction • Background • The MIT reactor and Transfer Line • Motivation • Safety measure in case of Transfer Line failure • Desired Findings • Model to help design snubbing section
Procedure • Apparatus • Experimental Procedure • Data Processing
Apparatus Smooth Section W/ Bend Transfer line Transfer Cylinder Snubbing Section First Sensor Second Sensor Pressure Sensor
Experimental Procedure • Calibration of pressure sensor • Drops at 4 heights for each of 3 different masses • Data Recorded
Data Processing • Calibration data • Capsule velocity calculated • Pressure calculations
Typical Data from Drop Test • Data taken form container mass = 0.7kg • Height = 42” inches
Data Trigger Trace from first sensor Trace from second sensor Trace from Pressure sensor
Theoretical Analysis • Model of the falling capsule • Transfer Line • Snubbing Section • MATLAB Simulation
Transfer Line Model • The capsule is a falling object
Snubbing Section Model • Force due to gravity • Force due to pressure • Ideal Gas Law – PV=mRT • Navier Stokes • Used to determine the mass of air left
MATLAB simulation • ODE 23 solver • State Variables • Position and velocity of capsule • Mass of air in snubbing section
Smooth Section Model • Velocity is independent of Mass • Velocity is a Function of Height • Velocity = 1.46*Height + 2.18 • Ave. Error of 16%
Snubbing Section Model • Initial Conditions: • Mass = 0.7kg • Velocity = 4.0m/s • Temperature = 298K
Recommendations • Temp = 574K • Velocity = 5.0m/s • Snubbing Length =1.5m • Max P=1.81kPa • Snubbing Length =1.0m • Max P=1.86kPa
Final • Temp = 574K • Velocity = 5.0m/s • Snubbing Length =1.3m • Max P=1.83kPa