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FLOW PATTERN a good length of liquid path a very long liquid path high liquid– vapor ratios
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FLOW PATTERN

Feb 03, 2016

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Oleg

FLOW PATTERN. a good length of liquid path. a very long liquid path. high liquid–vapor ratios. FLOW PATTERN. Cross flow. Double pass. SINGLE PASS. DOUBLE PASS. DOWN COMERS AND WEIRS. WEIR. Straight Horizontal Adjustable Notched. DOUBLE PASS SLOPPED DOWNCOMERS. MECHANICAL SUPPORTS. - PowerPoint PPT Presentation
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Page 1: FLOW PATTERN

FLOW PATTERN

a good length of liquid path

a very long liquidpath

high liquid–vapor ratios

Page 2: FLOW PATTERN

FLOW PATTERN

• Cross flow • Double pass

Page 3: FLOW PATTERN

SINGLE PASS

Page 4: FLOW PATTERN

DOUBLE PASS

Page 5: FLOW PATTERN

DOWN COMERS AND WEIRS

Page 6: FLOW PATTERN

WEIR

• Straight Horizontal

• Adjustable

• Notched

Page 7: FLOW PATTERN

DOUBLE PASS SLOPPED DOWNCOMERS

Page 8: FLOW PATTERN

MECHANICAL SUPPORTS

Page 9: FLOW PATTERN

MANWAY

Page 10: FLOW PATTERN

TRAY HYDRAULICS

Page 11: FLOW PATTERN

CAPACITY GRAPH FOR A TYPICAL BUBBLE-CAP TRAY

Page 12: FLOW PATTERN

FLOW REGIMES

Page 13: FLOW PATTERN

CLOSE-UPS

• Cellular foam • Froth (Operating regime)

Page 14: FLOW PATTERN

CLOSE-UPS• Emulsion regime • Froth regime

Page 15: FLOW PATTERN

TRAY EFFICIENCY

Overall efficiencyac

eqo N

NE

21010 log044923.0log27511.052782.0 oE

Efficiency correlation (O’Connell, 1946)

Page 16: FLOW PATTERN

MURPHREE EFFICIENCY MODEL

Thus,

inout

inoutMV yy

yyE

*

inout

inoutML xx

xxE

*

1234 xxxxxout

It is possible to have

outout yy *

1MVE

Page 17: FLOW PATTERN

SIEVE TRAY LAYOUT• Net area

• Hole area

• Active area

Page 18: FLOW PATTERN

LIQUID PRESSURE HEADS ON SIEVE TRAY

dugradcrestweirpdc hhhhhh

Page 19: FLOW PATTERN

PRESSURE HEADS ON BUBBLE CAP TRAY

Page 20: FLOW PATTERN

COLUMN DIAMETER

v

vLflood Ku

2.0

20

sbCK

floodop ufractionu )( 3600netv

vop A

MWVu

4

)( 2DiaAnet

3600)(

4

floodv

v

ufraction

MWVDia

EstimatesbC

L

v

v

Llv W

WF

fromsbC VS

Page 21: FLOW PATTERN

Capacity factor versus flow parameter

Page 22: FLOW PATTERN

ADIOS!• All of the references are provided during

class lectures.

• All of the pictures are taken from various books and Websites solely for educational purpose.

• The author is thankful to Dr, Syeda Sultana Razia, associate professor, ChE, BUET, for developing the core concept of this presentation.