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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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FLOW PATTERN
a good length of liquid path
a very long liquidpath
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
MANWAY
TRAY HYDRAULICS
CAPACITY GRAPH FOR A TYPICAL BUBBLE-CAP TRAY
FLOW REGIMES
CLOSE-UPS
• Cellular foam • Froth (Operating regime)
CLOSE-UPS• Emulsion regime • Froth regime
TRAY EFFICIENCY
Overall efficiencyac
eqo N
NE
21010 log044923.0log27511.052782.0 oE
Efficiency correlation (O’Connell, 1946)
MURPHREE EFFICIENCY MODEL
Thus,
inout
inoutMV yy
yyE
*
inout
inoutML xx
xxE
*
1234 xxxxxout
It is possible to have
outout yy *
1MVE
SIEVE TRAY LAYOUT• Net area
• Hole area
• Active area
LIQUID PRESSURE HEADS ON SIEVE TRAY
dugradcrestweirpdc hhhhhh
PRESSURE HEADS ON BUBBLE CAP TRAY
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
Capacity factor versus flow parameter
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.
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