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By Dave Onarheim MANE-6980 Engineering Project Spring 2010

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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By Dave Onarheim MANE-6980 Engineering Project Spring 2010

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  1. 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

  2. MANE-6980 Project- Concentric Tube HX • 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)

  3. Problem Description • 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

  4. Methodology and Expected Outcome • 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

  5. Milestones/Deadlines • 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

  6. Questions?

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