Irradiation sample transfer line snubbing section behavior
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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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Presentation Transcript

Introduction
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
Procedure

  • Apparatus

  • Experimental Procedure

  • Data Processing


Apparatus
Apparatus

Smooth

Section

W/ Bend

Transfer

line

Transfer

Cylinder

Snubbing Section

First Sensor

Second

Sensor

Pressure

Sensor


Experimental procedure
Experimental Procedure

  • Calibration of pressure sensor

  • Drops at 4 heights for each of 3 different masses

  • Data Recorded


Data processing
Data Processing

  • Calibration data

  • Capsule velocity calculated

  • Pressure calculations


Typical data from drop test
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
Theoretical Analysis

  • Model of the falling capsule

    • Transfer Line

    • Snubbing Section

  • MATLAB Simulation


Transfer line model
Transfer Line Model

  • The capsule is a falling object


Snubbing section model
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
MATLAB simulation

  • ODE 23 solver

  • State Variables

    • Position and velocity of capsule

    • Mass of air in snubbing section



Smooth section model
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 model1
Snubbing Section Model

  • Initial Conditions:

  • Mass = 0.7kg

  • Velocity = 4.0m/s

  • Temperature = 298K


Recommendations
Recommendations

  • Temp = 574K

  • Velocity = 5.0m/s

  • Snubbing Length =1.5m

  • Max P=1.81kPa

  • Snubbing Length =1.0m

  • Max P=1.86kPa


Final
Final

  • Temp = 574K

  • Velocity = 5.0m/s

  • Snubbing Length =1.3m

  • Max P=1.83kPa


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