Advanced Thermodynamics and Heat Transfer (ENGT5141)
2016-2017
COURSE WORK (23% of module marks)
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 heat exchanger at Tc,in oC at a rate of Am kg/s, where it is heated by exhaust gasses ( of your choice) that enters the heat exchanger at Th,in oC at a rate of Bm kg/s,
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 5m length and a fixed outer shell diameter of 1m. 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
350
0.4
2
2-3
7
375
0.4
3
4-5
10
400
0.4
1
6-7
12
425
0.4
0.7
8-9
15
450
0.4
2
Penultimate Digit of Student ID
Tube diameter (m)
Shell diameter (m)
Interface thickness (mm)
0-1
0.4
1
5
2-3
0.4
1
10
4-5
0.5
1
15
6-7
0.5
1
20
8-9
0.6
1
25
The work includes using a Fluid flow (CFX) analysis system (Figure 2) in Ansys workbench. 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 CFX solver (steady state calculation based on k-ε model)
5. Post processing the results: (Results)
Figure 2: CFX analysis system in Workbench
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
Marking guide
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.
10
Introduction/background
Role of CFD and Computational Heat Transfer methods in modelling and design of thermo-fluid systems
10
Review
The numerical methods used for convective heat transfer 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
10
Methodology
Mesh convergence and boundary conditions
25
Air inflow
Fuel inflow
Out-flow
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.
30
Conclusion
5
References/Appendices
At least 5 academic references
10
Total
100
Due date :Thursday 6th of April 2017
An electronic copy of the completed report should be submitted through the turnitin link on blackboard.
Muyiwa Oyinlola Ext. 7162; e-mail: muyiwa.oyinlola@dmu.ac.uk
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