text: The following convection diffusion equation is considered here
  In the above equation, four terms represents transience, convection, diffusion and a source term respectively, where
  *  is the temperature in particular case of heat transfer otherwise it is the variable of interest
  *  is time
  *  is the specific heat
  *  is velocity
  *  is porosity that is the ratio of liquid volume to the total volume
  *  is mass density
  *  is thermal conductivity
  *  is source term representing the capacity of internal sources
  The equation above can be written in the form
  where  is the diffusion coefficient.