Weep Fraction of Tray Calculator

✖Weep Rate refers to the rate at which liquid leaks or weeps through the tray or packing of a distillation column.ⓘ Weep Rate [W]			+10% -10%
✖Downcomer Liquid Load refers to the velocity of clear liquid component flowing through the downcomer entrance of a tray.ⓘ Downcomer Liquid Load [Q_D]			+10% -10%

✖Weep Ratio refers to the ratio of the liquid weeping or leaking through a tray or packing in a distillation column to the total liquid flow on that tray.ⓘ Weep Fraction of Tray [f_w]

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Formula

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Weep Fraction of Tray

Formula

`"f"_{"w"} = "W"/"Q"_{"D"}`

Example

`"0.801783"="0.4587m³/s"/"0.5721m/s"`

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Weep Fraction of Tray Solution

STEP 0: Pre-Calculation Summary

Formula Used

Weep Ratio = Weep Rate/Downcomer Liquid Load
f_w = W/Q_D
This formula uses 3 Variables

Variables Used

Weep Ratio - Weep Ratio refers to the ratio of the liquid weeping or leaking through a tray or packing in a distillation column to the total liquid flow on that tray.
Weep Rate - (Measured in Cubic Meter per Second) - Weep Rate refers to the rate at which liquid leaks or weeps through the tray or packing of a distillation column.
Downcomer Liquid Load - (Measured in Meter per Second) - Downcomer Liquid Load refers to the velocity of clear liquid component flowing through the downcomer entrance of a tray.

STEP 1: Convert Input(s) to Base Unit

Weep Rate: 0.4587 Cubic Meter per Second --> 0.4587 Cubic Meter per Second No Conversion Required
Downcomer Liquid Load: 0.5721 Meter per Second --> 0.5721 Meter per Second No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

f_w = W/Q_D --> 0.4587/0.5721

Evaluating ... ...

f_w = 0.801782905086523

STEP 3: Convert Result to Output's Unit

0.801782905086523 --> No Conversion Required

FINAL ANSWER

0.801782905086523 ≈ 0.801783 <-- Weep Ratio

(Calculation completed in 00.004 seconds)

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Credits

Created by Rishi Vadodaria

Malviya National Institute Of Technology (MNIT JAIPUR ), JAIPUR

Rishi Vadodaria has created this Calculator and 200+ more calculators!

Verified by Vaibhav Mishra

DJ Sanghvi College of Engineering (DJSCE), Mumbai

Vaibhav Mishra has verified this Calculator and 200+ more calculators!

< 25 Distillation Tower Design Calculators

Relative Volatility of Two Components Based on Normal Boiling Point and Latent Heat of Vaporization

Go Relative Volatility = exp(0.25164*((1/Normal Boiling Point of Component 1)-(1/Normal Boiling Point of Component 2))*(Latent Heat of Vaporization of Component 1+Latent Heat of Vaporization of Component 2))

Maximum Allowable Vapor Velocity given Plate Spacing and Fluid Densities

Go Maximum Allowable Vapor Velocity = (-0.171*(Plate Spacing)^2+0.27*Plate Spacing-0.047)*((Liquid Density-Vapor Density in Distillation)/Vapor Density in Distillation)^0.5

Column Diameter given Maximum Vapor Rate and Maximum Vapor Velocity

Go Column Diameter = sqrt((4*Vapor Mass Flowrate)/(pi*Vapor Density in Distillation*Maximum Allowable Vapor Velocity))

Tower Cross Sectional Area given Gas Volumetric Flow and Flooding Velocity

Go Tower Cross Sectional Area = Volumetric Gas Flow/((Fractional Approach to Flooding Velocity*Flooding Velocity)*(1-Fractional Downcomer Area))

Minimum External Reflux given Compositions

Go External Reflux Ratio = (Distillate Composition-Equilibrium Vapor Composition)/(Equilibrium Vapor Composition-Equilibrium Liquid Composition)

Maximum Allowable Mass Velocity using Bubble Cap Trays

Go Maximum Allowable Mass Velocity = Entrainment Factor*(Vapor Density in Distillation*(Liquid Density-Vapor Density in Distillation)^(1/2))

Minimum Internal Reflux given Compositions

Go Internal Reflux Ratio = (Distillate Composition-Equilibrium Vapor Composition)/(Distillate Composition-Equilibrium Liquid Composition)

Dry Plate Pressure Drop in Distillation Column Design

Go Dry Plate Head Loss = 51*((Vapor Velocity Based on Hole Area/Orifice Coefficient)^2)*(Vapor Density in Distillation/Liquid Density)

Flooding Velocity in Distillation Column Design

Go Flooding Velocity = Capacity Factor*((Liquid Density-Vapor Density in Distillation)/Vapor Density in Distillation)^0.5

Weep Point Velocity in Distillation Column Design

Go Weep Point Vapor Velocity Based on Hole Area = (Weep Point Correlation Constant-0.90*(25.4-Hole Diameter))/((Vapor Density in Distillation)^0.5)

Liquid Vapor Flow Factor in Distillation Column Design

Go Flow Factor = (Liquid Mass Flowrate/Vapor Mass Flowrate)*((Vapor Density in Distillation/Liquid Density)^0.5)

Downcomer Residence Time in Distillation Column

Go Residence Time = (Downcomer Area*Clear Liquid Backup*Liquid Density)/Liquid Mass Flowrate

Internal Reflux Ratio Based on Liquid and Distillate Flowrates

Go Internal Reflux Ratio = Liquid Reflux Flowrate/(Liquid Reflux Flowrate+Distillate Flowrate)

Column Diameter Based on Vapor Flowrate and Mass Velocity of Vapor

Go Column Diameter = ((4*Vapor Mass Flowrate)/(pi*Maximum Allowable Mass Velocity))^(1/2)

Head Loss in Downcomer of Tray Tower

Go Downcomer Headloss = 166*((Liquid Mass Flowrate/(Liquid Density*Downcomer Area)))^2

Height of Liquid Crest over Weir

Go Weir Crest = (750/1000)*((Liquid Mass Flowrate/(Weir Length*Liquid Density))^(2/3))

Active Area given Gas Volumetric Flow and Flow Velocity

Go Active Area = Volumetric Gas Flow/(Fractional Downcomer Area*Flooding Velocity)

Fractional Downcomer Area given Total Cross Sectional Area

Go Fractional Downcomer Area = 2*(Downcomer Area/Tower Cross Sectional Area)

Fractional Active Area given Downcomer Area and Total Column Area

Go Fractional Active Area = 1-2*(Downcomer Area/Tower Cross Sectional Area)

Internal Reflux Ratio Given External Reflux Ratio

Go Internal Reflux Ratio = External Reflux Ratio/(External Reflux Ratio+1)

Tower Cross Sectional Area given Fractional Active Area

Go Tower Cross Sectional Area = Active Area/(1-Fractional Downcomer Area)

Tower Cross Sectional Area given Active Area

Go Tower Cross Sectional Area = Active Area/(1-Fractional Downcomer Area)

Clearance Area under Downcomer given Weir Length and Apron Height

Go Clearance Area Under Downcomer = Apron Height*Weir Length

Fractional Active Area given Fractional Downcomer Area

Go Fractional Active Area = 1-Fractional Downcomer Area

Residual Head Loss in Pressure in Distillation Column

Go Residual Head Loss = (12.5*10^3)/Liquid Density

Weep Fraction of Tray Formula

Weep Ratio = Weep Rate/Downcomer Liquid Load
f_w = W/Q_D

What is Weeping?

Weeping refers to the undesired phenomenon where liquid leaks or bypasses the intended vapor-liquid contact areas on a tray or packing in a distillation column. It can occur when there is excessive liquid holdup on a tray, and the liquid starts to flow through unintended paths, such as bypassing downcomers or flowing over tray edges, rather than following the designed flow patterns.
Weeping disrupts the uniform distribution of liquid across the tray, leading to uneven vapor-liquid contact. This, in turn, reduces the efficiency of mass transfer between the vapor and liquid phases, compromising the separation of components.

How to Calculate Weep Fraction of Tray?

Weep Fraction of Tray calculator uses Weep Ratio = Weep Rate/Downcomer Liquid Load to calculate the Weep Ratio, The Weep Fraction of Tray formula is defined as the ratio of the liquid weeping or leaking through a tray or packing in a distillation column to the total liquid flow on that tray. Weep Ratio is denoted by f_w symbol.

How to calculate Weep Fraction of Tray using this online calculator? To use this online calculator for Weep Fraction of Tray, enter Weep Rate (W) & Downcomer Liquid Load (Q_D) and hit the calculate button. Here is how the Weep Fraction of Tray calculation can be explained with given input values -> 0.080178 = 0.4587/0.5721.

FAQ

What is Weep Fraction of Tray?

The Weep Fraction of Tray formula is defined as the ratio of the liquid weeping or leaking through a tray or packing in a distillation column to the total liquid flow on that tray and is represented as f_w = W/Q_D or Weep Ratio = Weep Rate/Downcomer Liquid Load. Weep Rate refers to the rate at which liquid leaks or weeps through the tray or packing of a distillation column & Downcomer Liquid Load refers to the velocity of clear liquid component flowing through the downcomer entrance of a tray.

How to calculate Weep Fraction of Tray?

The Weep Fraction of Tray formula is defined as the ratio of the liquid weeping or leaking through a tray or packing in a distillation column to the total liquid flow on that tray is calculated using Weep Ratio = Weep Rate/Downcomer Liquid Load. To calculate Weep Fraction of Tray, you need Weep Rate (W) & Downcomer Liquid Load (Q_D). With our tool, you need to enter the respective value for Weep Rate & Downcomer Liquid Load and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.

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