In　this　paper,　a　CFD　simulation　of　falling　film　on　a　horizontal　rotating　tube　is　illustrated.　The　objective　of　this　simulation　is　to　explore　the　influence　of　various　parameters　on　this　kind　flow.　The　simulation　results　show　that　in　a　certain　range,　the　offset　angle　of　the　liquid　column　increases　with　the　increase　of　the　rotational　speed,　which　agrees　well　with　the　experimental　values.　Compared　to　a　stationary　tube,　the　liquid　film　thickness　at　the　left　side　of　the　liquid　column　is　thinner　but　the　right　gets　larger　when　the　tube　is　rotating　counterclockwise.　And　the　liquid　film　velocity　at　the　left　side　of　the　liquid　column　is　equivalent　to　the　linear　superposition　of　the　velocity　at　the　standstill　and　the　rotational　velocity　denoted　by　omega.　Rotation　has　a　great　influence　on　the　velocity　distribution　at　the　right　side　of　liquid　column.　Increasing　the　rotational　speed　and　the　diameter,　decreasing　the　inlet　velocity　and　the　inlet　hole　diameter　will　make　the　offset　angle　of　the　liquid　film　larger.　The　high　temperature　reduces　the　offset　angle　of　the　liquid　column,　and　the　gradient　of　the　liquid　column　offset　angle　to　temperature　becomes　smaller.　When　the　temperature　is　above　65　degrees　C,　the　effect　of　temperature　on　the　offset　angle　of　liquid　column　is　negligible.　When　omega　=　200　rpm,　the　offset　angle　increases　first　and　then　decreases　with　the　increase　of　the　inlet　height,　but　when　omega　=　300　rpm,　the　offset　angle　increases　with　the　increase　of　the　inlet　height.　(C)　2017　Elsevier　Ltd.　All　rights　reserved.