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Two phase flow Regimes

Regims

Laboratory for two

phase flow

Kelvin - helmotz

fenomena

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Kelvin-Helmotz

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Section 4.1: Regimes

Vertical flow

Horizontal flow

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Section 4.1.1: Vertical flow

100,1

0,01

1,0

100

10

1,0

0,1

0,01

0,001

smU LS /

smUGS /

Dispersed bubble (small)

Dispersed bubble (medium)

Slug

Churn Annular

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Liquid flow at low to mediocre velocity and mediocre velocity for gas flow. Slug flow is characterized with large

bullet shaped Taylor bubbles and small bubbles flowing in-between.

Slug flow

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Churn flow

Liquid flow at low to mediocre velocity and high velocity for gas flow. Churn flow is characterized with large thin

bubbles and small bubbles flowing in-between.

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Dispersed bubble flow (DB)

This phenomena is divided into two: •Dispersed bubble flow (small) – characterized by small size bubbles, high liquid flow velocity and low to high gas flow velocity.•Dispersed bubble flow (medium) -

characterized by medium size bubbles, low to mediocre

liquid flow velocity and low to mediocre gas flow velocity.

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Annular flow

Gas flow at very high velocity and low to very high velocity for liquid flow. Annular flow is characterized with a

layer of liquid on the walls of the pipe and small bubbles of liquid in the

middle gas zone.

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Section 4.1.2: Horizontal flow

smUGS /100,

11,0

100

10

1,0

0,1

0,01

smU LS /

Dispersed bubble (DB)

Elongated bubble flow (EB/I)

Slug flow (I)

Annular – annular wavy – annular mist flow

Stratified wavy flow (SW)

Stratified smooth flow (SS)

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Stratified smooth flow

Flow at very low velocity, for both gas and liquid. Stratified smooth flow is characterized with a clear

distinguished line between gas and liquid.

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1test3

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Stratified wavy flow

Low liquid velocity and mediocre gas velocity. Since gas velocity is slightly higher then the liquid velocity,

its causing the liquid flow to create waves. This characterize stratified wavy flow.

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1test5.2

ULS=0,05 m/sUGS=5,00 m/s

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Elongated bubble flow

Mediocre liquid flow velocity and low das flow velocity. Characterized by large bubbles in the upper

zone of the liquid phase.

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2test7

ULS=0,30 m/sUGS=0,005 m/s

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Slug flow

Slug flow is an example of a flow regime in between. Both gas and liquid velocities are mediocre. Slug flow is representing both separation and mixing. Slug flow

is consequently referred to as an intermittent flow regime. Characterized with big bubble of gas

followed by a number of small bubbles.

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1test6

ULS=0,84 m/sUGS=1,96 m/s

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Dispersed bubble flow

Very high liquid velocity, and the gas velocity can vary from very low to very high. Characterized by small bubbles of gas moving mostly in the upper

zone of the liquid.

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2test5

ULS=2,71 m/sUGS=0,38 m/s

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Annular flow

Very high gas velocity, and the liquid velocity can vary from very low to very high. Characterized by a thin layer of liquid along the walls of the pipe, with bubbles of liquid moving in the middle gas zone.

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Section 4.2: Kelvin – Helmotz phenomena

1test11.1

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Section 4.3: Two phase flow laboratory

2test9

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1test7

Sensors

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1test8

Monitors

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2test6

Lacer beam

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