Metal Foams: A Design Guide

188 Metal Foams: A Design Guide
Pressure drop index, p/Re 2.6 ∼ ∼
400
300
200
150
100
50
Air thermal capacity
∼
d = 0.002
r = 0.15
= 0.1
∼
r ∼
r
∼
= 0.035
∼
d = 0.01
∼
d = 0.004
r = 0.05
∼
∼
d = 0.006
∼
Constant d
Constant r
∼
Air
∼
Re = 5000
∼
b = 0.2
∼
Kf = 0.011
Pr = 0.72
Nu = 1.0
∼
d = 0.008
0.008 0.01 0.02 0.03 0.04
∼ ∼
Heat dissipation index, k 2
f Pr /Q
Figure 13.5 The trade-off between pressure drop index and heat dissipation
index
parameters defined by the model and defined in Table 13.1 illustrates this
trade-off. It is shown in Figure 13.5.
References
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Bastawros, A.-F., and Evans, A.G. (1997) Proc. Symp. on the Applications of Heat Transfer in
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Bastawros, A.-F., Stone, H.A. and Evans, A.G. (in press) J. Heat Transfer.
Holman, J.P. (1989) Heat Transfer – a Modern Approach, McGraw-Hill, New York.
Kaviany, M. (1985) Int. J. Heat Mass Transfer 28, 851–858.
Lu, T.J., Stone, H.A. and Ashby, M.F. (1998) Acta Materialia 46, 3619–3635.