Transcript Project Presentation.ppt

Analysis and Comparison of the
Temperature Differences between
Concurrent and Countercurrent Flow
in Concentric Tube Heat Exchangers
By Dave Onarheim
MANE-6980 Engineering Project
Spring 2010
MANE-6980 Project- Concentric Tube HX
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Forced convection heat transfer is caused by fluid flow of different
temperatures passing parallel to each other separated by a
boundary (pipe wall)
Flow can be in the same direction (parallel) or in the opposite
direction (countercurrent)
Problem Description
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The overall objective is to determine the max temperature difference
in cases for both laminar and turbulent flow for a variety of flow rates
and inlet temperatures
Flow will be considered fully developed and incompressible
The cooling medium will be water and the working fluid oil
Viscosity and density of the fluids will remain constant
Specific heat and overall heat transfer coefficients are also assumed
to remain constant
Methodology and Expected Outcome
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Use COMSOL multiphysics to develop models of laminar and
turbulent flow
5 models will be done for both laminar and turbulent flow: normal
flow in a pipe, parallel flow, countercurrent flow, and fouled surfaces
for parallel and countercurrent types of HX
Mass flow rate as well as inlet temperature will be varied
Results will be analyzed using COMSOL and exported to Excel as
needed
Hand calculations will be done to use as a cross check
The countercurrent flow is expected to yield the larger temperature
difference in both fouled and unfouled HX surfaces
Milestones/Deadlines
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2/05/10:Project proposal due, Brief Presentation of proposed work
2/10/10:Complete research, Document results
2/17/10:Complete first model of laminar flow in a pipe, Complete second model of laminar flow for
2 concentric pipes (parallel flow HX) and document results
2/24/10:Complete third model of laminar flow for 2 concentric pipes (countercurrent flow HX),
Document results
2/26/10:First progress report due
3/03/10:Complete fourth and fifth models of laminar flow for 2 concentric Pipes (fouled HX
surface), Document results
3/10/10:Complete first model of turbulent flow in a pipe, Complete second model of turbulent flow
for 2 concentric pipes (parallel flow HX) and document results
3/17/10:Complete third model of turbulent flow for 2 concentric pipes (countercurrent flow HX),
Document results
3/19/10:Second progress report due, Comprehensive presentation of work
3/24/10:Complete fourth and fifth models of turbulent flow for 2 concentric Pipes (fouled HX
surface), Document results. Gather data, ensure all models and plots needed are obtained
3/31/10:Complete rough draft of paper, Complete peer editing
4/9/10:Final draft of project
4/21/10:Final report due, Comprehensive presentation of work
Questions?