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Irradiation Sample Transfer Line Snubbing Section Behavior

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

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  1. Irradiation Sample Transfer Line Snubbing Section Behavior Greg Padilla and Keane Nishimoto

  2. 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

  3. Procedure • Apparatus • Experimental Procedure • Data Processing

  4. Apparatus Smooth Section W/ Bend Transfer line Transfer Cylinder Snubbing Section First Sensor Second Sensor Pressure Sensor

  5. Experimental Procedure • Calibration of pressure sensor • Drops at 4 heights for each of 3 different masses • Data Recorded

  6. Data Processing • Calibration data • Capsule velocity calculated • Pressure calculations

  7. Typical Data from Drop Test • Data taken form container mass = 0.7kg • Height = 42” inches

  8. Data Trigger Trace from first sensor Trace from second sensor Trace from Pressure sensor

  9. Theoretical Analysis • Model of the falling capsule • Transfer Line • Snubbing Section • MATLAB Simulation

  10. Transfer Line Model • The capsule is a falling object

  11. 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

  12. MATLAB simulation • ODE 23 solver • State Variables • Position and velocity of capsule • Mass of air in snubbing section

  13. Results

  14. Smooth Section Model • Velocity is independent of Mass • Velocity is a Function of Height • Velocity = 1.46*Height + 2.18 • Ave. Error of 16%

  15. Snubbing Section Model • Initial Conditions: • Mass = 0.7kg • Velocity = 4.0m/s • Temperature = 298K

  16. Recommendations • Temp = 574K • Velocity = 5.0m/s • Snubbing Length =1.5m • Max P=1.81kPa • Snubbing Length =1.0m • Max P=1.86kPa

  17. Final • Temp = 574K • Velocity = 5.0m/s • Snubbing Length =1.3m • Max P=1.83kPa

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