As a method of measuring the mass transfer rate
dM/dt, the rate of change in the intensity of specularly reflected light
dI/dt has been employed. In the case of frost deposits, the relation
dM/dt=-KdI/dt (
K: const.) is shown to hold particularly well. Experiments show that
dM/dt is proportional to σ, Re
1/2,
n1/2 and ƒ(
Tm), where σ is the supersaturation with respect to ice, Re. the Reynolds number,
n the number of ice islands per unit area of mirror surface and ƒ(
Tm) a function of mirror temperature. In addition,
n is proportional to Re
1/2, exp[ln
2(Se)] and (
ΔTm/Δt), where Se is the saturation ratio and (
ΔTm/Δt) the cooling rate of the mirror surface. The optimum sensitivity for dew-point instrument must be set on the basis of these results.
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