Question

A single potassium chloride (KCl) spherical crystal 0.1 cm in diameter is immersed in a 5 % supersaturated solution containing 25wt% potassium chloride. Assuming the mass transfer coefficient is 0.012 cm/s, Calculate the rate mass flux of KCl to the crystal and consequently calculate the rate of crystal growth (cm/s)

Liquid solution density: 1.20 g cm-3

Crystal density: 2.0 g cm-3

Answer #1

The density of a saturated solution of potassium chloride is
1.175 g cm-3 at 250C. If 100g of solution
contains 35.25 g of KCl, what is the molarity ?

A saturated solution of potassium chloride at 90 °C
containing 700 kg potassium chloride is cooled to 20 °C in an open
tank by circulation of water. The cooling water enters the tank at
15 °C through a jacket and leaves at 25 °C. The solubility of
potassium chloride is 53.9 and 34.2 gm/100ml of water at 90 and 20
°C respectively, The average specific heat and density of the
solution are 0.48 cal/g.°C and 1.2 g/cm', respectively. Assuming
the...

A 1 m outer diameter spherical tank made of AISI 304 steel with
10 cm wall
thickness contains solid iced water at 0°C. Air at 25°C flows
outside the tank with a
velocity of 1 m/s. Determine the rate of heat transfer to the tank
and the mass rate (
m_dot) at which ice melts. Ignore convection effects of the melting
ice.
The latent heat of fusion of water at 0°C is 333.7 kJ/kg.
Thanks!

Data for carbon dioxide:
Molecular weight:44.0
Heat capacity of gas phase: 0.036+4.23
x10-5T (in kJ/moleoC, T is
in oC)
Viscosity Pr k
(W/m K)
180oC2.13 x10-5kg/(m
s) 0.721 0.029
130oC 1.93x10-5kg/(m
s) 0.738 0.025
80oC 1.72x10-5kg/(m
s) 0.755 0.020
Approximate density: 2.0 kg/m3
Data for water:
Molecular weight:18.0
Heat capacity for liquid water: 0.0754 kJ/mole
oC
Viscosity:
Viscosity Pr k
(W/m K)
180oC139 x10-6kg/(m
s) 0.94 0.665
130oC 278x10-6kg/(m
s) 1.72 0.682
80oC 472x10-6kg/(m
s) 3.00 0.658
Ideal gas constant:
0.08206 L atm/(mol K)
Carbon dioxide, with flow rate of 0.10 kg/s, is to be cooled
from 180 oC to 80...

A grey body is one whose absorptivity
1. does not vary with temperature and wavelength of the incident
ray
2. is equal to its emissivity
3. varies with temperature
4. varies with wavelength of the incident ray
A liquid is in equilibrium with its vapor at its boiling point.
On an average, the molecules in the liquid and gaseous phases have
equal
1. potential energy.
2. kinetic energy.
3.temperature. 4. intermolecular forces of attraction.
A liquid of density 1000 kg/m3...

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