irradiation sample transfer line snubbing section behavior greg padilla and keane nishimoto
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Irradiation Sample Transfer Line Snubbing Section BehaviorGreg Padilla and Keane Nishimoto
Introduction
BackgroundThe MIT reactor and Transfer Line
MotivationSafety measure in case of Transfer
Line failure Desired Findings
Model to help design snubbing section
Procedure
Apparatus Experimental Procedure Data Processing
ApparatusSmoothSectionW/ Bend
First Sensor
Snubbing Section
PressureSensor
SecondSensor
TransferCylinder
Transfer line
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 capsuleTransfer LineSnubbing 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=mRTNavier Stokes
Used to determine the mass of air left
2h
hdxdP
12μ1
ρAm 3
cair
MATLAB simulation
ODE 23 solver State Variables
Position and velocity of capsuleMass of air in snubbing section
Results
Smooth Section Model
Velocity is independent of Mass Velocity is a Function of Height Velocity = 1.46*Height + 2.18 Ave. Error of 16%
Velocity as a Function of Mass
3
3.5
4
4.5
5
5.5
300 500 700 900
Mass [g]
Vel
ocity
[m/s
ec]
height=1.07 m
height=0.72 m
height=1.73 m
Exp. Data and Therical models
2
2.5
3
3.5
4
4.5
5
0.5 1 1.5 2
Height [m]
Vel
ocity
[m/s
ec]
Exp. data
Gravity Model
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