Mechanical Report 4000words

Mechanical Report 4000 words

Faculty of Computing Engineering and Media – Coursework Specification 2018/19 Module name: Advanced Thermodynamics & Heat Transfer Module code: ENGT 5141 Title of the Assignment: CFD analysis in Heat transfer & combustion This coursework item is: Summative This summative coursework will be marked anonymously No The learning outcomes that are assessed by this coursework are:

1 Demonstrate proficiency in analysing advanced thermal cycles and heat transfer modes and their applications 2 Design and model heat and mass transfer on complex geometries using commercial or in-house computational codes and critically evaluate the results

This coursework is: Individual This coursework constitutes 50 % of the overall module mark. Date Set: 20/03/2019 Date & Time Due: 17:00 on Thursday 2nd May 2019 Your marked coursework and feedback will be available to you on 30th May 2019 If for any reason this is not forthcoming by the due date your module leader will let you know why and when it can be expected. The Head of Studies ( ) should be informed of any issues relating to the return of marked coursework and feedback. Note that you should normally receive feedback on your coursework by no later than 20 University working days after the formal hand-in date, provided that you have met the submission deadline.

When completed you are required to submit your coursework via: Turnitin Late submission of coursework policy: Late submissions will be processed in accordance with current University regulations which state: “the time period during which a student may submit a piece of work late without authorisation and have the work capped at 40% [50% at PG level] if passed is 14 calendar days. Work submitted unauthorised more than 14 calendar days after the original submission date will receive a mark of 0%. These regulations apply to a student’s first attempt at coursework. Work submitted late without authorisation which constitutes reassessment of a previously failed piece of coursework will always receive a mark of 0%.” Academic Offences and Bad Academic Practices: These include plagiarism, cheating, collusion, copying work and reuse of your own work, poor referencing or the passing off of somebody else’s ideas as your own. If you are in any doubt about what constitutes an academic offence or bad academic practice you must check with your tutor. Further information and details of how DSU can support you, if needed, is available at: offences.aspx and practice.aspx
Tasks to be undertaken: AIM The overall aim of this assignment is to demonstrate that you have a clear understanding of Thermal Analysis and Computational Fluid Dynamics (CFD) Methods, and the role these techniques play in development of heat and mass transfer systems, the benefits associated with their use and the problems and limitations encountered when using these methods. The above aim is to be achieved through a written report, not exceeding 5000 words.

CASE STUDY 1 In a heat recovery system, Cold water enters the counter-flow helical heat exchanger at Tc,in oC at a rate of Am kg/s, where it is used to recover heat from engine oil that enters the heat exchanger at Th,in oC at a rate of Bm kg/s. For the bench mark case use a pitch distance of 100mm for the helical coil. Each student will generate 2 case studies – A bench mark case which corresponds to the boundary conditions in the table below – ( Use the row that matches the last ID of your student P No). And another case where you optimise the design and operation of the heat exchanger. The objective is to optimise the rate of heat transfer, within the constraints of 1m length and a fixed outer shell diameter of 250mm. Flow rates must be realistic!

Figure 1: Schematic of Heat exchanger

Each student will use the following details for a base case and then optimise the heat transfer Last Digit of Student ID

Tc,in oC Th,in oC Am kg/s Bm kg/s

0-1 5 120 4 8 2-3 7 110 4 9 4-5 10 100 4 10 6-7 12 90 4 11 8-9 15 80 4 12

Penultimate Digit of Student ID

Tube diameter (mm)

Shell diameter (mm)

Interface thickness (mm)

0-1 20 250 5 2-3 22.5 250 10 4-5 25 250 15 6-7 27.5 250 20 8-9 30 250 25

You will need to work through the following steps

  1. Geometry Creation: using Ansys Design Modeller or importing from other CAD software such as Creo, Solidworks. etc
  2. Meshing the geometry: (Mesh) 3. Setting the boundary conditions: (setup) 4. Performing the simulation (Solution): Ansys fluent solver (steady state calculation) 5. Post processing the results:

CASE STUDY 2 The burner with the dimensions below should be built on meshed and solved in Ansys workbench using a basic combustion model (for methane-air mixture or any other mixture the student may opt to go for should be set in .

Figure 2: Burner Geometry

Last Digit of Student ID D(mm) 0-1 55 2-3 60 4-5 63.5 6-7 65 8-9 70

Figure 3: Burner Geometry 3D Deliverables to be submitted for assessment: Written report How the work will be marked: Item Possible

Marks Presentation/structure Aims/Objectives should be stated clearly and concisely Report should have clearly defined sections such as: Introduction, Review, Methodology, Results/ Discussion, Conclusions, References, etc.


Introduction/background Role of CFD and Computational Heat Transfer methods in modelling and design of thermo-fluid systems


Review The numerical methods used for convective heat transfer, combustion and fluid flow (CFD) and the latest development in these fields the basic theoretical principles underpinning modern computational Heat Transfer and CFD. Role of CFD and Computational Heat Transfer methods in modelling and design of thermo-fluid systems


Methodology Mesh convergence and boundary conditions Calculations to make decision and check results


Air inflow

Fuel inflow


Combustion chamber

Results and Discussion Discussing results of your case study: briefly interpreting and discussing the results and comparing it to the bench mark. General visualisation of the flow and temperature field may include:

Contours of velocity, temperature, pressure and any other relevant parameter. Vertical and axial profiles for velocity and temperature at specific location of interest Horizontal as well as cross-sectional images of velocity profiles coloured with other variables.

You should demonstrate understanding of theory of Navier-Stokes equation of motion and the various turbulence modelling used in CFD and in solving the 3D convective heat transfer equation (steady state only). Discuss the benefits that can be gained from using modern CFD and Computational Heat Transfer methods Discuss the limitations and problems associated with the use of CFD and Computational Heat Transfer methods.


Conclusion 5

References/Appendices At least 7 academic references


Total 100

Module leader/tutor name: Dr. Muyiwa Oyinlola Contact details: Ext. 7162
This coursework is:

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