A highly accurate dimensional and a less accurate non-dimensional model to describe particle transport due to combined convection, diffusion and thermophoresis in cooled laminar tube flows are presented. To verify the dimensional model, an experimental settup was built. Results determined by applying the model to describe the particle transport in the experimental setup are compared with the experimental data gained. The influences of different fluid mechanical and aerosol dynamical effects (e.g. temperature dependence of the material properties, particle diffusion, particle concentration profiles) on particle deposition are discussed. Applying the less accurate non-dimensional model a new thermophoretic parameter was found and a Simple approximation formula to calculate the total thermophoretic deposition efficiency is suggested. Results for axial deposition profiles considering particle transport due to convection and thermophoresis as well as convection, diffusion and thermophoresis are presented.