Answer the following questions. 1. What is the difference between the following terms:

1. What is the difference between the following terms:

· Pipe

· Conduit

· Duct

2. What are the pipe system components and give their definitions?

3. What is the difference between pipe flow and open-channel flow? Give examples.

4. What factors can affect the Reynolds number during the transition fro laminar to turbulent flow?

5. Why is velocity profile important in understanding different flows?

6. What is a valve? Give examples, indicating their functions.

7. What are the most important criteria for control valves?

9. Discussion. Complete the following diagrams and give all necessary explanations.

You will hear a part of a lecture series on Fluid Mechanics. For questions 1-10, complete the sentences with a word or phrase.

To discuss the dynamics we have to be able to describe (1)

The description of motion is called (2)

In the contracted flow (3) have been used to identify pieces of fluid.

In elementary mechanics we are used to describing a position of material time as a (4)

In infinity of mass point it is necessary to pick (5) called initial time.

Velocity is the function of (6)

From the Lagrangian velocity it is easy to calculate (7)

As Lagrangian measurements are very complicated, it is more convenient to make measurements at points fixed at (8)

The fact that velocity at point of laboratory coordinates is not always referred to the same piece of matter leads to (9) between Lagrangian and Eularian representations.

(10) is an advantage of laboratory coordinates.

Prepare the following presentations.

1. Laminar and turbulent flows

2. Valve and their functions

3. General Characteristics of Pipe Flow

4. Pipe system components

5. Fluid mechanics

WORDLIST

ENGLISH	RUSSIAN
air valve	воздуховыпускной клапан
cavitation	кавитация
check valve	обратный клапан
collapsing	разрушающий
conduit	трубопровод; труба
control valve	распределительный клапан
developing flow	развивающийся поток
driving force	движущая сила
duct	труба (не с круглым поперечным сечением)
excessive (pressure)	избыточное давление
expel (v)	исключать
flow (move)	поток; течение
flow control valve	дроссель, регулятор потока
fluid	флюиды
fully developed flow	развитый поток
isolation (block) valve	стопорный (запорный) клапан
momentum transfer	передача (перенос) импульса
open-channel flow	поток (в не полностью заполненной трубе)
operation	работа / процесс
pipe	трубопровод
pipe flow	поток в трубопроводе (в полностью заполненной трубе)
pipe system	система трубопроводных линий, сеть трубопроводов
pressure difference	разность давлений
pressure gradient	градиент давления
pressure transient	неустановившееся давление / давление в переходном режиме
release valve	выпускной клапан
relief valve	перепускной клапан
repair	ремонт
replacement	замена
reverse flow	обратный поток
shear stress	напряжение сдвига
shear stress	напряжение сдвига
velocity profile	скоростной профиль

UNIT 3

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