Our students perform a laboratory experiment to determine mass transfer from a wet paper towel experiencing forced convection and irradiation from radiant lamps. For the values of T ∞ and T w b prescribed on the sketch, the towel temperature was found to be T s = 310 K . In addition, flat-plate correlations yielded average heat and mass transfer convection coefficients of h ¯ = 28.7 W/m 2 ⋅ K and h ¯ m = 0.027 m/s , respectively. The towel has dimensions of 92.5 mm x 92 .5mm and is diffuse and gray with an emissivity of 0.96. (a From the foregoing results, determine the vapor densities, ρ A , s and ρ A , ∞ , the evaporation rate, n A ( k g / s ) , and the net rate of radiation transfer to the towel, q r a d ( W ) . (b) Using results from part (a) and assuming that the irradiation G is uniform over the towel, deter- mine the emissive power E , the irradiation G , and the radiosity J .
Our students perform a laboratory experiment to determine mass transfer from a wet paper towel experiencing forced convection and irradiation from radiant lamps. For the values of T ∞ and T w b prescribed on the sketch, the towel temperature was found to be T s = 310 K . In addition, flat-plate correlations yielded average heat and mass transfer convection coefficients of h ¯ = 28.7 W/m 2 ⋅ K and h ¯ m = 0.027 m/s , respectively. The towel has dimensions of 92.5 mm x 92 .5mm and is diffuse and gray with an emissivity of 0.96. (a From the foregoing results, determine the vapor densities, ρ A , s and ρ A , ∞ , the evaporation rate, n A ( k g / s ) , and the net rate of radiation transfer to the towel, q r a d ( W ) . (b) Using results from part (a) and assuming that the irradiation G is uniform over the towel, deter- mine the emissive power E , the irradiation G , and the radiosity J .
Solution Summary: The author explains how the mass transfer convection rate equation can be used to get water evaporation rate from the towel.
Our students perform a laboratory experiment to determine mass transfer from a wet paper towel experiencing forced convection and irradiation from radiant lamps. For the values of
T
∞
and
T
w
b
prescribed on the sketch, the towel temperature was found to be
T
s
=
310
K
. In addition, flat-plate correlations yielded average heat and mass transfer convection coefficients of
h
¯
=
28.7
W/m
2
⋅
K
and
h
¯
m
=
0.027
m/s
, respectively. The towel has dimensions of
92.5
mm x 92
.5mm
and is diffuse and gray with an emissivity of 0.96.
(a From the foregoing results, determine the vapor densities,
ρ
A
,
s
and
ρ
A
,
∞
, the evaporation rate,
n
A
(
k
g
/
s
)
, and the net rate of radiation transfer to the towel,
q
r
a
d
(
W
)
.
(b) Using results from part (a) and assuming that the irradiation
G
is uniform over the towel, deter- mine the emissive power
E
, the irradiation
G
, and the radiosity
J
.
Net movement of mass from one location, usually meaning stream, phase, fraction, or component, to another. Mass transfer occurs in many processes, such as absorption, evaporation, drying, precipitation, membrane filtration, and distillation.
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