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Problem Specification:
Air at 300K enters through a porous medium (Aluminum foam) of 10mm thickness and height
100mm. the width of heating plate is 150mm
Air properties: (at 300K) Density = 1.177 (boussinesq approx. applied) Cp = 1004.9 K = 0.0262 Viscosity = 1.84e-05
Porous Material Properties: (Copper Foam) – 150*100*10
Density = 8900 Cp = 386 K = 386 Permeability = 1.41e-07 Porosity = 0.86 Form Drag Coefficient: 5.57
Geometry: 150*10 mm
Meshing Details:
Element size: 1mm
Total cells: 1500
Effective thermal Conductivity:
Nields model = Ke = (Kf^(porosity))+( Ks^(1-porosity))
Ke = 2.34 (calculated)
I have adjusted the thermal consuctivity of Solid such that the effective thermal conductivity
comes to 2.345
Results:
Contours
1) Pressure contour
2) Temperature Contour
3) Density Contour
Graphs/plots:
1) Centerline Temperature
2) Pressure along center
3) Wall Heat Flux Distribution:
Mean temperature Values at different heights:
height Temperature in K
10mm 348.61
20mm 349.86
30mm 349.99
40mm 349.99
50mm 350
60mm 350
70mm 350
80mm 350
90mm 350
100mm 350
Note:
1) The form drag coefficient value was entered as double the value in fluent as it uses
½*(density)*C*V^2 to compute pressure drop due to from drag wheras the measured
value is from the formulae (density)*C*V^2 alone.
2) Boussiensq approximation makes the density to remain same throughout
3) The height mentioned by you in previous mail was 100mm whereas renju Kurian has
mentioned the height to be 150mm. please clarify
Results for 3m/s:
Contours
Pressure contour
4) Temperature Contour
5) Density Contour
Graphs/plots:
4) Centerline Temperature
5) Pressure along center
6) Wall Heat Flux Distribution:
Mean temperature Values at different heights:
height Temperature in K
10mm 326.192
20mm 337.866
30mm 342.798
40mm 349.99
50mm 347.032
60mm 348.07
70mm 348.833
80mm 349.393
90mm 349.58
100mm 349.742