  We study the motion of smooth, closed, strictly convex hypersurfaces in
$\mathbb{R}^{n+1}$ expanding in the direction of their normal vector field with
speed depending on the $k$th elementary symmetric polynomial of the principal
radii of curvature $\sigma_k$ and support function $h$. A homothetic
self-similar solution to the flow that we will consider in this paper, if
exists, is a solution of the well-known $L_p$-Christoffel-Minkowski problem
$\varphi h^{1-p}\sigma_k=c$. Here $\varphi$ is a preassigned positive smooth
function defined on the unit sphere, and $c$ is a positive constant. For $1\leq
k\leq n-1, p\geq k+1$, assuming the spherical hessian of
$\varphi^{\frac{1}{p+k-1}}$ is positive definite, we prove the $C^{\infty}$
convergence of the normalized flow to a homothetic self-similar solution. One
of the highlights of our arguments is that we do not need the constant rank
theorem/deformation lemma of Guan-Ma and thus we give a partial answer to a
question raised in Guan-Xia. Moreover, for $k=n, p\geq n+1$, we prove the
$C^{\infty}$ convergence of the normalized flow to a homothetic self-similar
solution without imposing any further condition on $\varphi.$ In the final
section of the paper, for $1\leq k<n$, we will give an example that spherical
hessian of $\varphi^{\frac{1}{p+k-1}}$ is negative definite at some point and
the solution to the flow loses its smoothness.
