Transcript Irradiation Sample Transfer Line Snubbing Section Behavior

Irradiation Sample
Transfer Line
Snubbing Section
Behavior
Greg Padilla and Keane Nishimoto
Introduction

Background


Motivation


The MIT reactor and Transfer Line
Safety measure in case of Transfer
Line failure
Desired Findings

Model to help design snubbing section
Procedure
Apparatus
 Experimental Procedure
 Data Processing

Apparatus
Transfer
line
Snubbing
Section
Smooth
Section
W/ Bend
Transfer
Cylinder
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
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Typical Data from Drop Test
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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

 1 dP 3 h 
m
 air  ρA c  
h  
2
 12μ dx

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

Results
Smooth Section Model
Exp. Data and Therical models
5.5
5
5
4.5
height=1.07 m
4.5
height=0.72 m
4
height=1.73 m
3.5
3
300
Velocity [m/sec]
Velocity [m/sec]
Velocity as a Function of Mass
4
Exp. data
3.5
Gravity Model
3
2.5
2
500
700
900
0.5
Mass [g]


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Velocity is independent of Mass
Velocity is a Function of Height
Velocity = 1.46*Height + 2.18
Ave. Error of 16%
1
1.5
Height [m]
2
Snubbing Section Model
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
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Initial Conditions:
Mass = 0.7kg
Velocity = 4.0m/s
Temperature = 298K
Recommendations
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Temp = 574K
Velocity = 5.0m/s
Snubbing Length
=1.5m
Max P=1.81kPa
Snubbing Length
=1.0m
Max P=1.86kPa
Final
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
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
Temp = 574K
Velocity = 5.0m/s
Snubbing Length
=1.3m
Max P=1.83kPa