Mass transfer coefficient

1. MASS TRANSFER COEFFICIENT
NAME: RAJDEEP SEN
ROLL.NO: 26408220018
SUBJECT: BIOPROCESS TECHNOLOGY (CBT 501)
DEPARTMENT: BSC. BIOTECHNOLOGY

2. INTRODUCTION
 Mass transfer may occur in a gas mixture, a liquid solution or solid.
The basic mechanisms are the same whether the phase is a gas, liquid, or
solid. The transfer of mass within a fluid mixture or across a phase
boundary is a process that plays a major role in many industrial process.

3. MASS TRANSFER COEFFICIENT
 the mass transfer coefficient is a diffusion rate constant
that relates the mass transfer rate, mass transfer area, and
concentration change as driving force
This can be used to quantify the mass transfer
between phases, immiscible and partially miscible fluid mixtures
(or between a fluid and a porous solid[2]). 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.

4. CONTD…
 Mass transfer coefficients can be estimated from many
different theoretical equations, correlations,
and analogies that are functions of material
properties, intensive properties and flow regime
(laminar or turbulent flow). Selection of the most applicable
model is dependent on the materials and the system, or
environment, being studied.

5. MASS TRANSFER COEFFICIENT UNIT
 (mol/s)/(m2·mol/m3) = m/s
 Note, the units will vary based upon which units the driving
force is expressed in. The driving force shown here as
'{displaystyle {Delta c_{A}}}' is expressed in units of moles
per unit of volume, but in some cases the driving force is
represented by other measures of concentration with
different units. For example, the driving force may be partial
pressures when dealing with mass transfer in a gas phase
and thus use units of pressure.

6. CONCLUSION
 Mass transfer coefficients are frequently regarded as a difficult
subject, not because the subject is inherently difficult, but because
of different definitions and because of complexities for mass
transfer from one solution into a second solution. These
differences merit further discussion.
 The complexities of definitions occur primarily because
concentration can be expressed in so many different variables. In
the above, we have assumed that it is expressed in mass per
volume or moles per volume. The concentration can equally be
well expressed as a mole fraction, which in the liquid phase is
commonly indicated by the symbol x1 and in a gas phase is written
as y1.

7. ACKNOWLEDGEMENT
 First and foremost, I would like to thank our teachers who guided us in doing this
project. They provided us with invaluable advice and helped us in difficult periods. Her
motivation and help contributed tremendously to the successful completion of the
project.
 Besides, I would like to thank our vice principal Prof. Gargi Gupta and our HOD madam
Prof Nilanjana Bhattacharya Nath who helped us by giving us advice and providing the
equipment which we needed. Also I would like to thank my family and friends for their
support. Without that support we couldn’t have succeeded in completing this project.

8. Thank you