How do you calculate the mass transfer coefficient of gas?
For a gas of constant molar concentration ck = RTkp = ky/c. For a dilute liquid solution k = (M2/ρ)kx, where M2 is the molecular weight of the solvent, and ρ is the solution density.
What is gas transfer coefficient?
The gas transfer coefficient is a function of the gas flow rate because the interface surface area i.e., the surface area of the air bubbles) increases as the gas flow rate increases.
What is HTU and NTU?
H = height of transfer units (HTU) – dimension of length. The number of transfer units (NTU) required is a measure of the difficulty of the separation. A single transfer unit gives the change of composition of one of the phases equal to the average driving force producing the change.
How is Sherwood number calculated?
where Sh is the Sherwood number, defined as Sh = kL dB/ D, where D is the diffusivity of the dissolved gas in the liquid and which can be estimated.
Why do we calculate mass transfer coefficient?
Quantifying mass transfer allows for design and manufacture of separation process equipment that can meet specified requirements, estimate what will happen in real life situations (chemical spill), etc.
What is Q in mass transfer?
q can be alternatively defined as the heat required to convert 1 mole of feed from its entering condition to a saturated vapor; divided by the molal latent heat of vaporization.
What is meant by mass transfer coefficient?
The rate of transfer of a given species per unit area normal to the surface, i.e., the species flux, depends on some of the physical properties of the system and on the degree of Turbulence of the phases involved.
What is overall mass transfer coefficient?
The overall mass transfer coefficient, also known as the total transfer velocity, is a key parameter in predicting the rate of pollutant emissions from aqueous solutions.
What is mass transfer process?
Mass transfer is the 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.
What is NTU and HTU in mass transfer?
N = number of transfer units (NTU) – dimensionless. H = height of transfer units (HTU) – dimension of length. The number of transfer units (NTU) required is a measure of the difficulty of the separation.