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  1. Ali768

    polyval and polyfit functions on noisy data

    dont know how critical your applicaion is but this is just a guess/approx ......... try fitting the linear fit first and estimate the mid points for each y clustered set this will give u linear fit (y = -0.5106 + 430.82)with R2 = 0.7799 (not good) with all clustered y values lying within 18%...
  2. Ali768

    help needed

    Hi I am a beginner in MATLAB. I have to develop a code in which I have to read two text files separately containing a column vector each (the vector size can be between 300-400, containing the decimals numbers). Once data is read as txt files I have to perform the following mathematics on it...
  3. Ali768

    Data smoothening

    It is not trasitory condition ............ I am using air flow through the pipe and that is used somewhere in the experimental setup ........... because i need a wide range of air flowrates, I had to use a existing compressor setup which uses two flowmeter lines one for low air flowrate and...
  4. Ali768

    Data smoothening

    Hello I have done some experimental research work and found out from data a kink (in the middle of the data )at the switching of the two flow meter lines (while using air)i.e. when i switch from low flowline to high flowline via controller. Obviously this is because of the low flowmeter is at...
  5. Ali768

    Calibration of flow meters-data smoothening

    Hello I have done some experimental research work and found out from data a kink (in the middle of the data )at the switching of the two flow meter lines (while using air)i.e. when i switch from low flowline to high flowline via controller. Obviously this is because of the low flowmeter is at...
  6. Ali768

    air flow from multiple outlets

    sorry did not understand your recent post........ (I) is the inlet, O1 is the first outlet and O2 is the second outlet. With massflowrates, O2 = I - O1. P,T at inlet and at O1 is known, the two (I and O1) are at about 12 meters from each other where as O2 is at about 38m from (I).
  7. Ali768

    air flow from multiple outlets

    Thanks Latexman & Chicopee I have calculated the all mass flow rates ........ now i want to calculate the volume flowrate of O2. the P,T values are known at inlet and at one of the 2 outlets i.e O1.without P,T at O2 how to find volume flowrate at O2. any idea or rough estimation? Aly
  8. Ali768

    air flow from multiple outlets

    Hi I have air coming in from a tank (one inlet) and going out from two outlets. The inlet has flowmeter metering Sm3/hr with actual P,T also defined. I also have another flow meter metering at one of the outlets giving me actual flowrate (also P,T) but i dont have any meter on the second...
  9. Ali768

    differential pressure transducer readings

    hi long time did not had any problems so was not on the forum but now i have one so here i am ................. last time i had pressure transducer problem but this time its differentail pressure transducer problem. i am using a DRUCK model differentail pr tranducer of 0.7 bar d with...
  10. Ali768

    selection of Pressure trasnducers!

    Thankyou btrueblood .....for your response. Yes your are right i will be measuring fluctuations and mean average pressure along the test section.Apart from usual two phase flow variables I will be looking at the flow pattern identification through pressure fluctuations.I intend to do with...
  11. Ali768

    selection of Pressure trasnducers!

    Hello I am designing a vertcial test rig i.e. vertcial pipe with shor horizontal run before the air-water enters in vertcial pipe to see the flow patterns (rig will work at atmospheric pressure). I am intertested in measuring the pressure along the pipe . any suggestion about the pressure...

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