For a WR 340 heat transfer of height with a liquid slab of thickness
,
or
is the physical constant which governs the microwave water heating process [4], [7] :
= 7.35
230 dB.° C/m = 1.690
dB.° C/mm = 0.194
°C/mm where
is in mm.
Using experimental data and
, the value of
,
and
can be deduced through the data given in Figs.1 and 2 in conjunction with the above formulae.
is a fraction of the total temperature variation
.
Fig. 1 Approximate conjugate ratio along the length of the heat tranfer.
For = 0.990
= 4.6
= 4.6v = 4.6
For = 0.999
= 6.9
= 6.9v = 6.9
Fig. 2 ratio dependence on the relative error.
For = 0.990
=
= 0.78
For = 0.999
=
= 0.85
is related to the process parameters with the formula :
°C = 3.79 (KW required)/GPM