Question

A rectangular plastic sheet (L= 1.52 m, W= 1.0 m) was wetted as a result of pouring 500 gm water. Estimate the time required to dry the plastic sheet if a dry air at 44°C is being used with a velocity 15 m/sec. Given: The vapour pressure of water at the liquid/gas interface = 2487 Pa Air viscosity = 1.93\times 10^{-5} kg/m.sec Air density = 1.12 kg/m³ Air molecular weight = 29 g/gmol $D_{AB} = 2.8 \times 10^{-5} m^2/sec$ Gas constant, R = $8.2 \times 10^{-5} m^3.atm/gmol.K$ 1 atm = 101325 Pa Flow of the gas parallel to a flat plate was correlated according to the following equations: $Sh = 0.664 Re_L^{1/2} Sc^{1/3}$ (laminar) $Re_L < 3 \times 10^5$ $Sh = 0.036 Re_L^{0.8} Sc^{1/3}$ (turbulent) $Re_L > 3 \times 10^5$

          A rectangular plastic sheet (L= 1.52 m, W= 1.0 m) was wetted as a result of pouring 500
gm water. Estimate the time required to dry the plastic sheet if a dry air at 44°C is being
used with a velocity 15 m/sec.
Given:
The vapour pressure of water at the liquid/gas interface = 2487 Pa
Air viscosity = 1.93\times 10^{-5} kg/m.sec
Air density = 1.12 kg/m³
Air molecular weight = 29 g/gmol
$D_{AB} = 2.8 \times 10^{-5} m^2/sec$
Gas constant, R = $8.2 \times 10^{-5} m^3.atm/gmol.K$
1 atm = 101325 Pa
Flow of the gas parallel to a flat plate was correlated according to the following equations:
$Sh = 0.664 Re_L^{1/2} Sc^{1/3}$ (laminar) $Re_L < 3 \times 10^5$
$Sh = 0.036 Re_L^{0.8} Sc^{1/3}$ (turbulent) $Re_L > 3 \times 10^5$

A rectangular plastic sheet (L= 1.52 m, W= 1.0 m) was wetted as a result of pouring 500
gm water. Estimate the time required to dry the plastic sheet if a dry air at 44°C is being
used with a velocity 15 m/sec.
Given:
The vapour pressure of water at the liquid/gas interface = 2487 Pa
Air viscosity = 1.93×10^-5 kg/m.sec
Air density = 1.12 kg/m³
Air molecular weight = 29 g/gmol
DAB = 2.8 × 10^-5 m^2/sec
Gas constant, R = 8.2 × 10^-5 m^3.atm/gmol.K
1 atm = 101325 Pa
Flow of the gas parallel to a flat plate was correlated according to the following equations:
Sh = 0.664 ReL^1/2 Sc^1/3 (laminar) ReL < 3 × 10^5
Sh = 0.036 ReL^0.8 Sc^1/3 (turbulent) ReL > 3 × 10^5

Added by Jacob B.

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