code: public double convert(double value, double temperatur, double viscosity){
  		return temperatur*kB / (Math.PI*viscosity*value);
  	}
docs: Converters the diffusion coefficient to hydrodynamic diameter and vice versa
  @param value Diffusion coefficient in [m^2 s^-1] or hydrodynamic diameter in [m]
  @param temperatur Temperatur in [Kelvin]
  @param viscosity Viscosity in [kg m^-1 s^-1]
  @return Hydrodynmaic diameter [m] / diffusion coefficient [m^2 s^-1]