Itpresentstheone-dimensionalunsteadydensetransportequationinthetubeforMHDpulverizedcoalfeed.ThesimplifiedfrictionalforcetermintroducedbyLiuisusedintheequation.ThenumericalsolutionhasbeengotbyusingMacCormackmethod.Theresultsshowthatthereexistsoptimalloadingrateinwhichstatevelocityisnotoscillationalongatube.Itiswellagreedwithmeasurement;italsopreventsasedimentinthetube.