How do I plot a log log graph using this equations?

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Discussion Overview

The discussion revolves around plotting log-log graphs for two equations involving gas and liquid flow rates, specifically focusing on how to discern the parameters M and P from these equations. Participants are exploring methods to visualize the data collected and the mathematical transformations required to analyze the relationships between the variables.

Discussion Character

  • Exploratory
  • Technical explanation
  • Mathematical reasoning

Main Points Raised

  • One participant presents two equations, (HgAh) and (HdAm), and seeks guidance on plotting these as functions of gas flow rate (G) while keeping liquid flow rate (L) constant.
  • Another participant suggests using gnuplot as a suitable software for plotting, indicating its effectiveness and availability.
  • A participant questions whether Excel could be used instead and expresses confusion about how to derive the parameters P and M from the logarithmic transformations of the equations.
  • A later reply mentions having already collected data for various gas and liquid flow rates, indicating readiness to proceed with the analysis.

Areas of Agreement / Disagreement

There is no consensus on the software to use for plotting, as participants suggest different tools. Additionally, there is uncertainty regarding the mathematical steps needed to extract parameters from the equations.

Contextual Notes

Participants have not resolved how to take the logarithm of the equations to isolate parameters M and P, and there may be assumptions about the data's suitability for log-log plotting that have not been explicitly stated.

davekardle
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(HgAh)=ChG^mL^n
(HdAm)=CmG^pL^q


I need to plot (HgAh) and (HdAm) As Fuction of G( Gas flow rate) with lines of Constant L( Liquid flow rate) and discern M and P from the equations above from Log Log Graphs.

I have collected a table of raw data with Various G at constant L.

How do I proceed?
 
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It depends on the software you have available.
I can recommend gnuplot. It's free, it's good, and it's a standard tool.
 
fuchs said:
It depends on the software you have available.
I can recommend gnuplot. It's free, it's good, and it's a standard tool.
Can't I just do it on excel ?
I don't undersntand how to get P and M from these equations by taking the log

log (hG aH) = log (Ch G^m L^n)

and

log ( hD aM) = log (Cm G^p L^q)

any idea?
 
I already have all the HdAm and HgAh for various Gas and Liquid flowrates
 

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