Page 12 - Modelling in Transport Phenomena A Conceptual Approach

PREFACE ix

Chapter 1 covers the basic concepts and their characteristics. The terms ap-
pearing in the inventory rate equation are discussed qualitatively. Mathematical
formulations of “rate of input” and “rate of output” terms are explained in Chap-
ters 2, 3 and 4. Chapter 2 indicates that the total flux of any quantity is the sum
of its molecular and convective fluxes. Chapter 3 deals with the formulation of the
inlet and outlet terms when the transfer of matter takes place through the bound-
aries of the system by making use of the transfer coefficients, i.e., friction factor,
heat transfer coefficient and mass transfer coefficient. The correlations available in
the literature to evaluate these transfer coefficients are given in Chapter 4. Chapter
5 briefly talks about the rate of generation in transport of mass, momentum and
energy.
Traditionally, the development of the microscopic balances precedes the macro-
scopic balances. However, it is my experience that students grasp the ideas better
if the reverse pattern is followed. Chapters 6 and 7 deal with the application of
the inventory rate equations at the macroscopic level.
The last four chapters cover the inventory rate equations at the microscopic
level. Once the velocity, temperature or concentration distributions are determined,
the resulting equations are integrated over the volume of the system to get the
macroscopic equations covered in Chapters 6 and 7.
I had the privilege of having Professor Max S. Willis of the University of
Akron as my Ph.D supervisor who introduced me to the real nature of transport
phenomena. All that I profess to know about transport phenomena is based on the
discussions with him as a student, a colleague, a friend and a mentor. His influence
can be easily noticed throughout this book. Two of my colleagues, Guniz Gtiriiz
and Zeynep Hiqgqmaz Katnq, kindly read the entire manuscript and made many
helpful suggestions. My thanks are also extended to the members of the Chem-
ical Engineering Department for their many discussions with me and especially
to Timur Do& Tiirker Gurkan, Gurkan Karakq, &der ozbelge, Canan ozgen,
Deniz her, Levent Yilmaz and Hayrettin Yucel. I appreciate the help provided by
my students, Glilden Camqi, Yqim Guqbilmez and Ozge Oguzer, for proofreading
and checking the numerical calculations.
Finally, without the continuous understanding, encouragement and tolerance of
my wife Ayqe and our children, Cigdem and Burcu, this book could not have been
completed and I am grateful indeed.
Suggestions and criticisms from instructors and students using this book will
be appreciated.

ISMAIL TOSUN (itosun@metu.edu.tr)
Ankara, Turkey
March 2002