  In the current work the time evolution of baryon diffusion flow within the
scope of second order relativistic hydrodynamic theory has been studied for a
2-component quark-gluon system. The relaxation time for diffusion flow is
estimated using the Grad's moment method of many particle kinetic theory. The
temperature dependence of relaxation time for diffusion flow has been obtained
for different quark chemical potentials. Finally, the diffusion equation has
been solved for a $1+1$ dimensional boost invariant system and the effect of
diffusion flow has been studied on the thermal photon spectra in a baryon rich
environment. The present analysis on the role of baryon number diffusion in
influencing the properties of hot QCD medium could be relevant for the baryon
rich matter explorations in upcoming experimental facilities.
