Coffee cup

1
Coffee cup

• Ola Dahlin
• Patrik Sondell

2
Overview

• Background
• Experimental setup
• Method
• Conclusions

3
Background

• Heat transfer
• Convective
• Radiative
• Conductive

4
Experimental setup

• Water temperature 353 K
• Measurments of the temperature every 30 s
• Isolated with styrofoam
• Aluminium foil to remove masstransport.

5
Method

• Grid generation in Gambit
• CFD analysis in Fluent
• Verification of models and parameters
• Validation against experimental results

6
Grid
Mesh density
Outline of the grid
7
CFD analysis

• Transient multiphase model, VOF
• Radiation model
• DO
• P1
• Boundary conditions
• Wall conditons, outlet or no outlet

8
Verification
Boundary condition impact
9
Radiation
a)
b)
c)
a) DO-model. b) P1-model c) No radiation.
10
ValidationNusselt number

• Nusselt number over a flat plate with free
  convection

11
Bulk temperature
12
Conclusions

• Simulation versus analogies
• Physical model versus actual performance