  The drag and diffusion coefficients of charm and bottom quarks propagating
through quark gluon plasma (QGP) have been evaluated within the framework of
perturbative Quantum Chromodynamics (pQCD). Both radiative and collisional
processes of dissipation are included in evaluating these transport
coefficients. The dead cone as well as the LPM effects on radiative energy loss
of heavy quarks have also been considered. The Fokker Planck equation has been
solved to study the dissipation of heavy quarks momentum in QGP. The nuclear
suppression factor, $R_{\mathrm AA}$ and the elliptic flow $v_2^{HF}$ of the
non-photonic electrons resulting from the semi-leptonic decays of hadrons
containing charm and bottom quarks have been evaluated for RHIC and LHC nuclear
collision conditions. We find that the observed $R_{\mathrm AA}$ and $v_2$ at
RHIC can be reproduced simultaneously within the pQCD framework.
