Bird's book "Transport Phenomena"

• Classical
• Est120
In summary, the conversation discusses the equation of Hagen-Poiseuille in the book "Transport Phenomena" by Bird. The equation involves a variable related to pressure, but in a particular exercise, the gravity term disappears. The individual asking the question is curious about why the pressure is taken into account in this exercise but not in a previous exercise on thin films. They mention a 1960 edition of the book and ask for clarification on the exercise they are referring to.
Est120
in the book " transport phenomena" (Bird) when obtaining the famous equation of hagen poiseuille
Bird defines a variable that involves the pressure, but when doing an exercise a term magically disappeared, someone could explain to me what happened
why we took into account the pressure in this balance and in the previous exercise (thin film) we did not

watch this

I have a 1960 edition (!) and found HP $$Q={\pi \left ( {\mathfrak P}_0 - {\mathfrak P}_L \right ) R^4\over 8\mu L}\qquad\qquad(2.3-19)$$
##{\mathfrak P} = p - \rho gz## and (2.3-10) is as in your picture.

What exercise are you referring to with

berkeman
BvU said:
I have a 1960 edition (!) and found HP $$Q={\pi \left ( {\mathfrak P}_0 - {\mathfrak P}_L \right ) R^4\over 8\mu L}\qquad\qquad(2.3-19)$$
##{\mathfrak P} = p - \rho gz## and (2.3-10) is as in your picture.

What exercise are you referring to with

View attachment 248629
In chapter 2 ,but in 2nd edition after balancing momentum in a pipe

The term that involves gravity ,what happens with that term?

Est120 said:
we took into account the pressure in this balance and in the previous exercise (thin film) we did not
Didn't find a thin film exercise -- but it will likely be vertical flow. Perhaps yours is horizontal ? Still don't know what exercise you are referring to. Can you post the complete problem statement for the example you are asking about or do you want me to keep sleuthing ?

vanhees71

1. What is the main focus of Bird's book "Transport Phenomena"?

The main focus of Bird's book "Transport Phenomena" is to provide a comprehensive understanding of the fundamental principles and equations governing the transport of mass, momentum, and energy in various systems.

2. Who is the target audience for this book?

The target audience for this book is primarily undergraduate and graduate students in chemical, mechanical, and civil engineering, as well as other related fields.

3. What makes "Transport Phenomena" a valuable resource for scientists?

"Transport Phenomena" is a valuable resource for scientists because it presents a unified approach to understanding the transport of mass, momentum, and energy, which are essential concepts in many fields of science and engineering.

4. Does the book provide practical applications of the principles discussed?

Yes, "Transport Phenomena" includes numerous examples and problems that demonstrate the practical applications of the principles discussed, making it a valuable resource for researchers and practitioners in various industries.

5. Is prior knowledge of transport phenomena required to understand this book?

Prior knowledge of transport phenomena is not required to understand this book, as it provides a clear and thorough explanation of the fundamental concepts and equations. However, a basic understanding of calculus and differential equations is recommended.

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