Question

A well located in the desert is 10 m deep to the water level and 1.0 m in diameter. The stagnant air and water in the well are at 30 0C and normal atmospheric pressure. A slight breeze of dry air is blowing across the top of well. Calculate the rate of steady-state diffusion of water vapour in the well. (Assume partial pressure of water vapour in the air = vapour pressure of water at 30 0C). Diffusivity of water vapour in air at 30 0C is DAB = 2.6*10-5 m2/sec. Vapour pressure of water at 30 0C = 4.112 kN/m2.

Answer 1

Explanation:

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[3963] – 103

T.E. (Petroleum) (Semester – I) Examination, 2011DRILLING & PRODUCTION OPERATIONS(2003 Course)

Time : 3 HoursMax. Marks : 100

Instructions :

1)Question Nos.

1

and

5

are

compulsory

. Out of the

remaining

attempt

2

questions from Section

I

and

2

questions from Section

II

.2)Answers to the

two

Sections should be written in

separate

books.3)

Neat

diagrams must be drawn

wherever

necessary.4)Black figures to the

right

indicate

full

marks.5)

Use

of Logarithmic Tables, Slide Rule, Mollier Charts,Electronic Pocket Calculator and Steam Tables is

allowed

.6)Assume

suitable

data, if

necessary