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  ThermoFluidCalc — Offline Fortran Execution Guide
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Calculator : Thermal Entry Length Calculator
Category   : Convection

Files Included:
  - entry_length.f90 (Fortran Source Code)
  - input.txt (Pre-configured Sample Input)

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1. How to Compile
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Make sure you have a Fortran compiler installed (like gfortran).
Run the following compilation command in your terminal:

  gfortran -O3 entry_length.f90 -o entry_length

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2. How to Execute
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Run the compiled binary and redirect the input.txt file into stdin:

  entry_length < input.txt

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3. Input File Details
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The input file 'input.txt' contains sequential parameters separated by
newlines. Here is the structure of the included 'input.txt':

  Line 1 (Pipe diameter D [m]): 0.025
  Line 2 (Mean flow velocity V [m/s]): 1.0
  Line 3 (Inlet fluid temperature Tin [C]): 25.0
  Line 4 (Wall temperature Tw [C]): 80.0
  Line 5 (Pipe length L [m]): 0.5
  Line 6 (Fluid type (1=Air, 2=Water, 3=Oil)): 1
  Line 7 (Custom density [kg/m3] (0=auto)): 0.0
  Line 8 (Custom viscosity [Pa-s] (0=auto)): 0.0
  Line 9 (Custom thermal conductivity [W/m-K] (0=auto)): 0.0
  Line 10 (Custom Prandtl number (0=auto)): 0.0
  Line 11 (Custom specific heat [J/kg-K] (0=auto)): 0.0
  Line 12 (Boundary condition type (1=Uniform Wall Temp, 2=Uniform Heat Flux)): 1.0

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ThermoFluidCalc — https://thermofluidcalc.com
