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( 5 ) The permeability of polyethylene is much higher than the nylon for the oxygen gas. For packaging pharmaceutical product ( medicine ) ,
The permeability of polyethylene is much higher than the nylon for the oxygen gas. For packaging pharmaceutical product medicine it required to keep the diffusion flux of atmospheric oxygen to the medicine as low as possible to avoid its oxidation to increase the shelf life product expiry Based on your mass transfer knowledge, which of the following options will you choose
a film of polyethylene PE
b film of nylon NY
ci film of PE and ii film of NY
di film of NY and ii film of PE
In laminar flow regime, the transport of mass occurs
a mainly by molecular diffusion
b mainly by turbulent diffusion eddies
c random motion of eddies
d all of these is correct
In turbulent flow regime, the transport of mass occurs
a mainly by molecular diffusion
b mainly by turbulent diffusion eddies
c random motion of solute molecules
d none of these is correct
In convective mass transport, the convective mass transfer coefficient depends upon
a molecular transport of solute only
b turbulent transport of solute only
c both molecular and turbulent solute transport
d none of these is correct
The Reynolds number, is the ratio of
a convective to diffusive mass transport
b inertial forces to viscous forces
c momentum diffusivity to mass diffusivity
d none of these is correct
The Schmidt number, is the ratio of
a convective to diffusive mass transport
b inertial forces to viscous forces
c momentum diffusivity to mass diffusivity
d none of these is correct
The Sherwood number, is the ratio of
a convective to diffusive mass transport
b inertial forces to viscous forces
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